ML20086U257

Estimated Frequency of Loss of Offsite Power Due to Extremely Severe Weather & Severe Weather for Salem & Hope Creek Generating Stations

ML20086U257
Person / Time
Site:	Salem, Hope Creek
Issue date:	03/31/1989
From:	NUS CORP.
To:
Shared Package
ML20086U248	List: ML20086U243 ML20086U257
References
NUS-5175, NUDOCS 9201070287
Download: ML20086U257 (49)

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Estimated Frequency of Loss of Offsit 3 Power Due to I Extrmely Severe Weather (ESW) and Severe Weather (SW) for i

I Salem and Hope Creek Generating Stations I

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I Prepared for Public Service Electric & Gas Company Newark, New Jersey Prepared by NUS Corporation 910 Clopper Road E- P. O. Box 6032 Gaithersburg, Maryland 20877-0902 5

March 1989 E

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5 P2010702:57 9112J0 DR ADOCK 0000 1 NUS CCAPC:

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Table of Contents Section P -

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1.0 INTRODUCTION

11 2.0 ESilMATED FREQUENCY OF LOSS OF 0FFSITE f 0WER DUE TO SEVERE WEATHER (SW) 2-1 2.1 Annual Expectation of Snowf all 21 2.2 Annual Expectation of Tornadoes of Severity f2 or Greater 22 1 2.3 Annual Expectation of Storms with Wind Speeds between 75 and 124 MPH 25 2.4 Annual Expectation of Storms with significant Salt Spray 2-10 3.0 ESTIMATED FREQJENCY OF LOSS OF OFFSITE POWER DUE TO EXTREMELY SEVERE WEATHER (ESW) 3-1 l

4.0 CONCLUSION

S 4-1

5.0 REFERENCES

5-1 APPENDIX ! - Snowfall Data for 100 Stations in the Atlantic Coastal Zone Adjacent to the Site APPENDIX II - Tornadoes within 125 Nautical Miles (NH) of Latitude 39.47N. Longitude 75.53W I

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List of Tables T a bl e . Page 1-1 Estimated Frequency of Loss of Of fsite Power, SW Group 1-2 1-2 Estimated Frequency of 1.oss of Of fsite Power, ESW Group 1- 2 2-1 Observed Fastest One-Minute Wind Speed Adjusted to True Annual Fastest One-Minute Wind Speed at 10M for Wilmington, Delaware 2-7 1 2-2 NOREG/CR-4492 - Computer Program Output for Evaluating Extreme Wind Probabilities at Wilmington, Delaware 29 3-1 Extreme Wind Data for Delaware Breakwater, Delaware and Cape May, New Jersey 3-2 2- NUREG/CR-4492 - Computer Progret Output for Evaluating Extreme Wind Probabilities at Delaware Breakwater ar.d Cape May, New Jersey 3-5 l-I. .

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. List of Figures Figure p3ge 21 Mean Annual Snewf all Totals (Inches) in the vicinity-of Salem and Hope Creek Generating Stations 2-3 22 Tornadoes within 125 NM of Latitude 39.47N, longitude 75.53W 2-4 I

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1.0 INTRODUCTION

h This report presents site-specific estimated frequencies of loss of offsite pcwer due to extremely severe weather (E5W) and severe weather (SW) applic for Salem and Hope Creek Ger.erating Stations.

The estimated frequencies

'or the severe weather c0mponents are input into equation (1) and the resulting frequency evaluated using Table 1-1 to determine a SWThegroup.

estimated frequency determined for the extremely severe weather is evaluate

' using Table 1-2 to determine the ESW group.

These groups are then used to define coping catagory duration for Salem and Hoce Creek Generating Stat .

The f actors combined in equation (1) yield the estimated frequency lessot of offsite power due to severe weather (Reference 1).

f = (1.3 x 10*#) . h1+b.h2 + (1.2 x 10-2)h3+c*h4(1) where h

1 = annual expectation of snowfall for the site in inches b

= 12.5 for sites with multiple rights of way b

= 72.3 for sites with a single right of way h

2 = annual expectation of tornacoes of severity f2 or greater at the site (i.e. wind speeds greater thin or equal to 113 miles per, hour) in events per square mile h

3 = annual expectation of storms for the site with wind speeds betwetn 75 and 124 mph c

= 0.78 f f site is vulnerable to effects of salt spray c = 0 for other sites h

4 = annual expectation of storms with significant salt spray for the site E

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1-1 NUS COAPCAAT-f

The resulting f is evaluated using Table 1-1 to determine the SW group.

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Tatie 1-1 l Estimated Frequency of Loss of Offsite Pcwer, SW Group SW Group Estimated Frecuency of Loss of Offsite Power 1

f < 0.0033 2

0.0033 1 f < 0.0100 3 0.010; i f < 0.0330 4

0.0330 i f < 0.1000 5 0.1000 i f The frequency deternined in Section 3.0 for extremely severe weather is evaluated using Table 1-2 to determine the ESW group.

Table 1-2 .

Estimated Frequency of Less of Offsite Power ESW Group ESW Group Annual Wind Speed Expectation [125 MPH 1

e < 3.3 x 10~4 2

3.3 x 10-4 1 e < 1.0 x 10~3 3

1.0 x 10'3 1 e < 3.3 x 10~3 f 4 3.3 x 10'3 1 e < 1. 0 10'2 5 1.0 x 10-2 3 ,

1 The procedures used to calculate the estimated frequencies are presented in U.S. Nuclear Regulatory Comission, Regulatory Guide 1.155 (Reference 1) and NUMARC B7-00, " Guidelines and Technical Bases for NUMARC Initiatives Addressing Station Blackout at Light Water Reactors." (Reference 2). NUMARC 87-00 provides tables containing estimated frequencies for Salem and Hope Creek for each severe weather category and extremely severe weather provided 4

NUS COAPC A A"'

'g by the Nuclear Regulatory Ccnmission (NRC) staff based upon numerous I

climatological sources.

These default estimated frequencies may be used to caleviate each neather group (ESW and SW) in the event site-specific analyses are not avail able.

The follewing sections present site scecific analyses for each of the weather categories based epon data ;*cvided in the Ap;endices.

References are provided in Secticn 5.0 and all assumptions and equations used to perform the analyses are provided in the appropriate secti0ns.

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• f 2.0 ESTIMATED FREQJENCY OF LOSS OF OFFSITE POWER DUE TO SEVERE WEATHER (SW)

The estimated frequency of less of offsite pc er due to severe weather (SW) consists. of four components, each of ahich is addressed in detail in Sections ,

2.1, 2.2, 2.3, and 2.4 The four components are labeled bl, h;, h3, and h4 l in equation (1) and were calculated using data prcvided in the references listed in Section 5.0.

The mean annual snowfall total in inches that f alls on the site in any year, 51, was determined from isopleths drawn from snowfall data from 100 stations located in six states along the Atlantic coastal zone adjacent to the site.

The expected frequency of "f2+" tornadoes per square mile for the site, hg, was computed t rom a 38-year period of observed tornado data within a two-degree 'iatituda by longitude rectangle centered on the site. The expected l frequency of storms with winds between 75 and 124 mph at the site, h 3, was t.cmputed from National Weather Service annual fastest observed one. minute winds at Wilmington, Delaware, utilizing a Type I extreme value distribution.

The last component, h4 , the expected frequency of hurricanes and tropical

. storms with significant salt spray for the site is included for completeness only, since the MRC (Reference 2) has determined that this component is :ero for Salem and Hope Creek and does not contribute to the estimated frequency nf loss of offsite power due to severe weather, i 2.1 Annual Expectation of Snowfall i A site-specific annual snowfall analysis for the Salem and Hope Creek Generating Stations site was per?o,rmed using data obtained from National I Oceanic and Atmospheric Administration (NOAA) publications (References 3 and 4). This analysis evaluated mean annual snowfall totals for periods of record 30 years or greater for 100 stations. Stations were selecter' in the states of Virginia, New Jertey, Maryland, Delaware Pennsylvania, and New l York. These data were used to derive mean annual average snowfall totals and the associated gradients along the east coast. The Newark, Delaware g snowfall total was omitted from the analysis because of its low value (15.3 inches). A review of data surrounding this station revealed that this value may be anomalous.

Three separa*.e :entouring r0utines were used in creating mean annual sn:wf all isopleths.

All three routines ;roduced similar resul ts in the vicinity of g the site area. Figure 2-1 presents isopleths of sn0wf all totals at these locations using a nearest neighbor trending analysis. Appendix ! presents the referenced data, in:luding the city, state, snowf all total period of record, latitude, longitude, and elevation of the recording statien.

I Interpolation between isopleths for the site area shews a 19.3-inch mean annual snowf all total.

2.2 Annual Expectation of Tornadoes of Severity f2 or Greater The annual expt.ctation of tornadees of severity f2 or greater at the site (i.e., wind speeds greater than or equal to 113 miles per hour) in events per square mile was calculated from data provided by the National Severe I Storms Forecast Center (NSSFC), Kansas City, Missouri. The NSSFC data pro-vide the year, month, day, time, beginning latitude and longitude, end latitude and longitude, width, and Fujita-Pearson scale estimates of force, path lergth and path width.

AP - x II presents 371 tornado observations recorded within a 125. nautical.

n...e (NM) radius centered on latitude 39.47N and longitude 75.53W, the approximate site location, for a period of record of 38 years provided by NSSFC.

Of the 371 tornadoes included withi- the 125 NM radius -f the site, lig tornadoes were present with a force of f2 or greater, g The 119 tornadoes of force f2 or greater are shown plotted on Figure 2-2 9

within a circle of radius 125 NM. Based on the distribution of tornadoes on Figure 2-2, it was determined that a rectangle consisting of 2 degrees lati-tude by 2 degrees longitaie, centered on the site, would best represent the annual expected frequency of tornadoes of severity f2 or greater in events per square mile. This area consists of topographically similar terrain and minimizes the area over water for which little or no reliable tornado data g are available. The rectangle representing 2 degrees of latitude by 2 degrees of longitude is shown in Figure 2-2.

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FIGuf!E 2-1 MEAN ANNUAL SNOhFALL TOTALS (INCIIES)IN TifE VICINilY OF SALEM AND llOPE CHEEK GENEHATlHG SI 4'lONS

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l The area representing this rectangle consists of the following:

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-l Total area = 14,743 mi 2 Land area = 11,778 mi 2 Water area = 2,965 mi 2 ,

Reducing the total area of the rectangle by the area of water for which I little c' no tornado data exist provides the area for which tornado data are recorded. Figure 2-2 indicates 39 tornadoes observed within the rectangle for the 38-year period of record provided by the NSSFC. Therefore, the expected frequency of tornadoes of severity f2 or greater in events per l square mile is l 39/11,778 = 3.31 x 10~3 for the 38-year period of record. The annual expectation is therefore l

3.31 x 10'3/38 = 8.71 x 10-5 2.3 Annual Expectation of Stems with Wind Speeds between g 75 and 124 MPH ,

Wind data from the first order National Weather Service (NWS) station at Wilmington, Delaware, for a period of record of 39 years (1949-1987) was used to determine the expected frequency of storms with winds between 75 and

-124 mph at the site. The NWS station is located approximately 15 miles north-west of the site and is the closest first order station to the site.

The methodology for estimating extreme winds at the site is detailed in

. HUREG/CR-4492. = Methodology for Estimating Extreme Winds for Probabilistic

.' Risk Assessment = (Reference 2). Annual observed fastest one-minute wind data from the Wilmington NWS station were adjusted to approximate the true annual fastest one-minute value by adding the constant of 13 mph to each l

observed fastest one-minute wind as recommended in the above reference.

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e p.ese adjusted aind s;eeds were then corrected f:r a stancard 10 meser

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(1 * " x 0.02) W g jeg c -'d h Z n

where V(2) = observed wind speed - in mph or m/s Zo = roughness length - in meters Z

= gnemometer height above ground - in meters Id = zero plane displacement - meters l V(10) = 10-meter wind speed - in mph or m/s l obtained from Reference 5. The zero plane displacement Zd is zero for airport-type exposures, as is the case for the Wilmington NWS station. The roughness length is 0.05 meters, as recommended by the reference.

During the 39-year period of record (1949-1987), the anemometer height at Wilmington was at 34 feet from December 5,1947 to July 16, 1956, and a.t 20 feet from July 16, 1956 to the present. No adjustments for anemometer height were made for those wind speeds measured at 34 feet since this height approximates the 10-meter standard height. Table 2-1 presents the annual f fastest observed one-minute sind speed for the 39-year period of record with the corresponding adjustments as described above.

I The method of moments is used to estimate parameter values of the Type-I distribution te calculate extrege values of wind speed for the site.

I this method, a scale parameter of the wind speed distribution is In estimated from the standard deviation of the observed extreme value data using S = 0.7797 S(u) (3) 5(u) = the standard deviation of the annual observed extreme wind speeds a

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Table 2-1 vbserved Fastest One-Minute Wind Speed Adjustad to True Annual Fastest One-Minute Wind Speed at 10M for l Wilmington, Delaware Fastest Obs. 1 Min. Plus 13* Anemometer Adjustnent to 10M Year Sceed (.ch) Direction (mDh) Height (ft) Aremometer Height 1949 38 NW 51 34 51 1950 46 SSE 59 34 59 1 1951 35 SSE 48 34 AB 1952 43 SSE 56 34 56 1953 38 NW 51 34 51 1954 58 SSW 71 1 1955 40 E 53 34 34 71 53 1956 46 WNW 59 34 59 1957 46 WNW 59 20 I 1958 43 NE 56 20 65 61 1959 42 WNW 55 20 60 1960 42 WNW 55 20 60 f 1961 1962 43 44 ENE WNW 56 57 20 20 61 62 1963 48 W 61 20 67 1964 42 300 55 'O 1 1965 44 200 57 20 60 62 1966 32 220 45 20 49 1967 42 240 55 20 60 1968 39 280 52 20 57 1969 39 270 52 20 57 1970 40 320 53 20 58

-l 1971 1972 46 42 350 290 59 20 65 55 20 60 1973 42 300 55 20 60 1974 35 060 48 20 53 1 1575 39 310 52 20 57 1976 40 310 53 20 58 I 1977 1978 1979 40 35 35 310 280 310 53 48 48 20 20 58 53 20 53 1980 39 320 l 1981 1982 35 39 320 290 52 48 52 20 20 20 57 53 57 1983 39 310 52 20 57 1984 I- 1985 46 38 300 320 59 51 20 20 65 56 1986 35 320 48 20 53 1987 46 320 59 20 65 s

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In addition, the mode of the Type I distribution is estimated frem tre mean g anc standard deviation of the annual Observed extremes by

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m = E(u) - (0.5772 s) (4)

E(u) = the expected mean value of the extreme data The mean of 6.he annual observed extreme wind data as presented in Table 2-1 is 58.128. The calculated standard deviation is 5.033. Substituting the.

values in equations 3 and 4 above, the scale parameter is 3.928 and the mode l is 55.861. The scale parameter and mode were then input into a computer code provided in Reference 6 to calculate probabilities of occurrence for wind speeds in the range of 40 to 'u0 mph in increments of 10 miles per hour.

Interpolation between the probabilities calculated for 70 mph and 80 mph to estimate the probability that an observed annual extreme wind will have a value of 75 mph or greater yields a probability of 0.015. The probability of extreme wind greater than 124 mph is calculated by interpolation between the probabilities of 120 mph and 130 mph, yielding 0.60 x 10~7 Subtracting .

h this probability from that calculated for winds greater than 75 mph yields the probability associated with the desired range, still 0.015 for 3 l si gnificant figure!..

The output of the computer code is presented in Table 2-2 with the associated confidence limits for each probability, A tornado strike probability is also presented on +2he computer output. The tornado strike I probability within the desired range is added to the extreme wind probability to obtain a composite probability for the occurrence of the two events.

Following the interpolation procedure and difference calculet' n as described ,

above, the tornado strike probability with the range of 75 mph and 124 mph l is 0.23 x 10 .

The estimated frequency fc storms with wind speeds between 75 and 124 rounds to 0.02 per year.

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NUS CCAPCW

I Table 2 2 ,

MUREG/CR 4492 Computer Program Output for Evaluating I Extreme W?nd Probabilitiet at Wilmington, Delaware l

l Eti:EPE WIND ESilMATION PROGPM OATED 9/5/86 WILM!NGTON CBSERVED EXTREME WINDS 39 OBSERVATIONS. MODE 55.8610, SCALE - 3.9280 EASTERN UNITED STATES l

TORNADO STRIKE PROBABll.lTY 0.124E 03

$PD Y PROB. CONF LIM. T. PROB.

I 40 50 4.04 1.49 0.10E+01 0.99E+00 33 47 43 51 0.12E 03 0.12E 03 60 1.05 0.29E+00 58 62 0.12E 03 3.60 I 70 80 6.15 8.59 0.27E 01 0.21E 02 66 75 76 90 0.12E 03 0.12E 03 90 0.17E 03 83 105 0.12E 03 100 11.24 0.13E 04 91 120 0.llE 03 110 13.78 0.llE 05 99 135 0.llE.03 120 16.33 0.60E 07 107 150 0.10E 03 .

130 18.87 0.00E+00 116 165 0.94E 04 I lt0 150 21.42 23.97 0.00E+00 0.00E+00 124 132 181 196 0.84E 04 0.74E 04 160 26.51 0.00E+00 141 212 0.63E 04 170 29.05 0.00E+00 149 227 0.52E 04 1 180 31.50 0.00E+00 ISB 243 0.42E 04 190 34.15 0.00E+00 166 259 0.32E 04 36.70 0.00E+00 175 274 0.24E 04 l

l 200 210 2N 39.24 41.79 0.00E+00 0.00E+00 184 290 192 .106 0.17E 04 0.12E 04 230 44.33 0.00E+00 201 322 0.76E 05 E 240 46.88 0 00E+00 209 338 0.47E 05 1 5 250 49.42 0,.00E+00 218 354 0.2BE 05 260 51.97 0.00E+00 227 370 0.16E 05

! a 270 54.52 0.00E+00 236 386 0.82E 06 t

5 280 57.06 0.00E+00 244 403 0.40E 06 290 59.61 0.00E+00 253 419 0.19E 06 I

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I 2.4 Ar..wal Expectation of stonts with significant Salt spray  :

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is tetermired to te O fer Salem and Here Creek Ge e a Sta e,s . e t o u e t i , t a x e f ,em a ,4,,, ,4 e a,.t , a, t .,,,, ,,,,,, ,,

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G 3.0 ESTIMATED FRE0VENCY OF LOSS OF 0FFS!iE P0kTR DUE TO EXTREMELY SEVERE WEATHER (ESW) k ire methode1cgy em;loyed to calculate the annual espectation of stores , .tn ind s;eeds between 75 and 124 mph in Section 2.3 is used here to calculate g the expectstion of stoims at the site with wind speeds greater than or equal to 125 mph. The wird data, however, are obtained frcm Reference 5 and represents the combination of wind data from the coastal sites, Delaware Breahater, and Cape May, New Jersey. The wind data from these coat,tal it(s are more representative of the extreme winds associated with the occurrence of great hurricanes during which wind speeds may be expected to equal ir exceed 125 mph. In additten, the extreme winds provided for these l sites include 15 tropical storms of which only 2 events are common to both sites.

I The period of record available /cr Delaware Sreahater is 1880-1884,1898 g 1941,19501961, and 1967, representing 59 years of annual fastest mile wind data. The period of record for Cape May, New Jersey is 1872 1885 and 1898 1927, representing 44 years of annual fastest mile wind data. The data are presented in Table 3-1. The combined data set contains 103 year.s of extreme annual wind data, the mean of which is 53.126 with a standard l deviation of 11.638. Substituting the standard deviation in equation 3 yields a s.: ale parameter of 9,074 The mode calculated from the mean and l standard deviation of the annual observed extremes is calculated using equation 4 and yields 47.888. Utilizing the program provided in Reference g 6' to criculate probabilities of occurrence based on the calculated s: ale parameter and mean, interpolating as describar! in Section 2.3, and adding the tornado strikt probability yields 6.5 x 10*4 as the estimated frequency I of loss of offsite power dhe to ex'tremely severe weather. Table 3 2 pre-sents the computer code output with associated confidence limits for each proNbility.

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! Table 31 Extreme Wind Data for Delaware Breakwater, Delaware and Ctpe May, New Jersey

, (Pa9e 1 of 3)

Location: Delaware Breakwater Delawre

' Speed at Measured True Standard Ht Stom 3 Date $ceed $ceed (10 M) Direction TyLe 06/12/1880 116 BS 79 W 03/09/1881 100 76 69 NE I 01/10/1883 1882 MISSING 68 53 48 N 02/20/1884 110 84 76 NW 09/2!i/1898 78 I 10/31/1599 12/09/1900 82 68 60 63 53 54 57 48 NE NE NV T

07/06/1901 72 55 l

51 NW 03/19/1902 80 62 56 NW 09/16/1903 90 69 62 NE T 09/14/1904 114 87 79 NW T I 01/25/1905 04/23/1906 78 75 60 60 54 54 N

NW 12/10/1907 86 66 60 5 5 02/14/1908 80 62 56 5 03/04/1909 92 70 63 NE 12/15/1910 80 62 56 NW 06/12/1911 72 56 l

51 SW 02/21/1912 86 66 60 SW 01/03/1913 78 60 54 SW '

03/02/1914 88 68 61 W I 31/12/1915 04/15/1916 78 76 60 59 54 53 NE NW 05/28/1917 78 60 54 W I 04/10/1918 08/13/1919 02/04/1920 82 78 78 63 60 60 57 58 54 NE N

NE 04/23/1921 73 57-l 51 E 08/03/1922 67 452 47 NW 03/19/1923 70 54 49 UN K

', 06/25/1924 84 65 59 NW S 12/02/1925 84 65 59 NE E 11/16/1926 72 56 51 SE 07/11/1927 80 62 56 NW 01/24/1928 120 91 82 SW I 04/15/1929 72 66 60 NE 12/02/1930 60 56 50 NW 04/01/1931 62 57 51 NE l 03/06/1932 76 70 63 NW r

08/23/1933 78 72 65 NE T L 1934 MI5ttNG NUS CCAAC A

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I Table 31 Extreme Wind Data for i Delaware Breakwater. Delaware and Cape May. New Jersey

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t.ecation:

Delaware Breakwater. Delaware (Continued)

Speed at Meesured True Standard Ht Date Seted Speed Storm (10 'O Direction i 11/17/1935 70 65 Tyoe 59 N 09/18/1936 77 71 64 NE T 04/26/1937 60 56 50 [

11/24/1938 63 58 55 N 01/22/1939 67 62 SB NW 02/14/1940 I 03/08/1941 71 65 65 60 61 56 N

NE 01/06/1950 76 70 63 NW 02/07/1951 66 61 l 3 10/02/1952 12/31/1953 7

6 65 55 58 HW W

'61 55 W

' 10/15/1954 75 69 62 S T l 01/13/1955 60 56 50 5 09/26/1956 W

70_ -65 ' 58 - N T 04/08/1957 66 61 55 NW 1958 MISSING 04/02/1959 60 56 50 HW 09/11/1960 98 89 80 NW T 06/02/1961 70 65 -58 l 09/16/1967 68 63 57 W

N T Iource: NUREG/CR-2639. pp. 27, 28 i Note: Wind speed in units of miles per hour T = Tropical Storm i

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Table 3 1 l l' Extreme Wind Data for ,

Delaware Breakwater. Delaware and Cape May New Jersey  ;

(Page 3 of 3)  !

Location: Cape May New Jersey i speed at

[ 3 ate-Measured Sceed True Sceed Standard Ht (10 M) Otrection

. storm Tyre

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03/20/1872 j

60 47 a2 03/10/1873 UNK i_ 11/23/1874 55 43 38 UN K 60 47 42  :

02/25/1875 UN K 78 - 60 54  !

12/09/1876 '86 66 UN K i- 10/04/1877- 80 62 59 UN K i

55 NW T

-10/23/1878 110 84 75 11/20/1879 E T 112 85 76-

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-03/25/1880 110 84 75 11/20/1881 UNK 92 70 63 NW 12/07/1882 80 62 55

-11/12f 1883 NW i

'I-- 04/10/1884 87 67 60 NW 106 81 72 W 01/26/1885 105 80 72 10/18/1898 NW 62 _49 44  ;

02/27/1899 64 50 45 E '

08/06/1900 W '

50 - 1. 0 37 N 04/13/1901 44 35 32  ;

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-03/16/1902 51 41 38 i 09/16/1903 63 49 45 NE T 09/15/1904 70 54 50 {

NW T 11/30/1905 50 40 37 NW 04/23/1906 41 33 31 NW 12/14/1907 48 38 35-e- E 1 02/15/1908_- 66 51 47 l 5

03/03/1909 44 35 32 NE 12/15/1910 48 38 35-  ;

NW 10/18/1911 54 43 40  ;

SE "

02/22/1912 ' ' 54 43 40 SW 01/03/1913 52 41 38 SW 03/01/1914' ~52 41 38 NW 01/12/1915 50 40 38

( 04/15/1916 NE 52 41 38 NW 04/05/1917 50 40 38 SE

- 01/12/1918 60 47 44  ;

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03/29/1919 50 40 38

. NW-02/04/1920 76 59 55 05/04/1921- .E-44 41 NE

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01/02/1922 60- 47 44 NW

+ 10/23/1923 66 51 48 NE T 01/16/1924 65 51- 48 3- SE 02/26/1925 49 39 37 4 NW 02/03/1926- 43 35 33 NE 02/20/1927 64 50 47  !

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-source: _MUREG/cR-lbJy p.-94 Note: Wind speed in Units of miles per hour T = Tropical'$torm .

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Table 3 2 NUREG/CR 4492 - Computer Program Output for Evaluating Extrene Wind Probabilities at

[ Delaware Breakwater and Cape May. New Jersey EXTREME WIND ESTIMAT!ON PROGRAM OATED 9/5/86 COASTAL OBSERVED EXTREME WINDS 103 OBSERVATIONS. MODE = 47.8880. SCALE = 9.0740

• EASTERN UNITED STATES TORNA00 STRIKE PROBABit.lTY a 0.124E 03 '

SPD Y PROB. CONF LIM. T. PROB.

40 0.69 0.86E+00 38 42 0.12E 03 50 0.33 0.51E+00 48 $2 0.12E 03 f 60 1.33 0.23E+00 57 63 0.12E 03 t 70 2.33 0.93E 01 66 74 0.12E 03 lio 3.31 0.36E 01 74 86 0.12E 03 90 4.28 0.14E 01 82 98 0.12E 03 100 5.24 0.53E 02 90 110 0 llE 03 110 6.19 0.20E 02 99 121 0.llE 03 120 7.14 0.79E 03 107 133 0.10E 03 130 8.08 0.31E 03  !!5 145 0.94E 04 '

140 9.02 0.12E 03 123 157 0.84E 04 1 150 9.95 0.48E 04 132 168 0.74E 04-t 160 10.88 0.19E 04 140 180 0.63E 04 I-  :

170 11.80 0.75E 05 148 192 0.52E 04 180 12.72 0.30E 05 156 204 0.42E 04 -

190 13.64 0.12E 05 164 -216 0.32E 04 l 200 210 14.55 15.46 0.48E 06 0.24E 06 173 227 0.24E 04 181 239 0.17E 04 220 16.37 0.60E 07 189 251 0.12E 04 l

1 230 17.27 0.00E+00 197 263 0.76E 05 240 18.17 0.00E+00 205 275 0.47E 05 250 19.07 0.00E+00 214 286 0.28E 05 260 19.97 0.00E+00 222 298 0.16E 05 1 270 20.86 0.00E+00 230 310 0.82E 06 280 21.76 0.00E+00 238 322 0.40E 06 290 22.65 0.00E+00 246 334 0.19E 06 l

Q j ,

35

- - . - . = - .~

r -

• i y .'

o 4.0 CONCl.0$!ONS g ne utitated frequency of 'oss of offsite ;cwer due to severe eather (SW) at Salet and Hope Creek Generating Statief.s based en equation (1) and variables, 51, h2, $3, and h4 , as calculated in the previcus sections, is f * (1.3 x 10*")

• 19.3 + 12.5 . B.71 x 10-5 + (1.2 x 10'2)

• 0.02 + 3. 0 fa 3.34 x 10-3 The coefficient of 12.5 in the above equation it used in cases of multiple l righte of way (Reference 7).

g From Table 1-1, it is determined that the SW Group for Salat and Hope Creek Generating Stations is 2.

I From Section 3.0, the estimated frequency of loss of offsite power due to extremely severe weather (ESW) was determined to be 6.5 x 10*4 . Ta'le b 12 provides an ESW Group of 2 for this estimated frequency.

I .

I I '

I I

41 g py

l o ,.'

g 5.0 REF(RENCES

1. U.S. N.sclear Reggiatery Commissi:n. IMB.

5tstien Blackeg , Aegust. ~gul Se a tcry Sui te 1.lM .

I 2.

Nuclear Management and Resources C:yntil . Inc.,1987, NgyARC B7 00, s t a ti:n' Bl ac cul at Li ght W at er R ea c t ors. No vemoer.hidelines 3.

National Oceanic and Atmospheric Administratien (NCAA). HB5. C1! mates of the States. Vols 1 and 2.

I 4 National Climatological Oceanic and Atmospheric Administration (NOAA). Lecal Data.

5. Changery. M.J.1982.

NUREG/CR 2639. Historical Extreme Winds for the United States - Atlantic and Gulf of Mextco Co.stunes. Repared for ~the U $. Nuclear Regulatory Commission. May.

6. U.S. Nuclear Regulatory Comission.19B6 for Ettimating September. Extreme Winds for Probabilistic Risk Assessments,NUREG/CR 4

~~

7 l Personal ccmunications between M. Adams of P$E&G and J. Annett of N 1

I I

1 '

I I

E t ^

<o ,<

i t i i

i APPEN0!X 1 Snowfall Data for 100 Stations in the l Atlantic Coastal Zone Adjacent to the Site '

I E i 1

1 J

I I

I

- . -u= e = =?

~

muus sumus sur o sumus s1EE MEN M Muus mus umms M Men sueur W 8I .M M .

SNOWFALL DATA i

l Mean Annual Period of Number Elevation of Latitude N Longitude W l Snowfall Record (Deg-Sec) (Feet)

(Yeary Years (Deg-Sec)

City Stato (Inches) - _ - - ----- --- ---- - - - - - - . -

41-51 73-37 alS 30 NY 51. -> 1951-80 73-38 128 NILLBROOK 1951-80 30 40-44 HY 26.7 40-48 73-01 55 NINEOLA 29.2 1951-80 30 NY 41-23 74-41 470 PATCHOGUE 1951-80 30 NY 45.7 41-38 73-53 154 l PORT JERVIS 42.6 1951-80 30 NY 40-59 73-48 199 POUGHKEEPSIE 1951-8C 30 NY 36.3 38-02 78-31 870 l SCARSCALE 1951-80 30 VA 24.2 78-00 420 CHARIMITESVILLZ 20.6 1951-80 30 38-28 CULPEPER VA 37-20 78-23 450 16.8 1951-80 30 FARMVILLE VA 38-18 77-28 100 VA 17.7 1951-80 30 77-18 40 FREDERICKSBURG 1951-80 30 37-18 VA 10.8 77-56 300 HOPEWELL 1951-80 30 36-46 VA 12.7 79-26 1060 IAWRENCEVILLE 1951-80 30 37-47 VA 72.9 38-02 78-00 420 LEXINGTON 20.1 1951-80 30 IDUISA VA 38-40 78-23 1200 27.4 1951-80 30 LURAY VA 36-54 76-12 24 7.9 1949-85 37 NORFOLK VA 38-09 79-02 1385 25.9 1951-80 30 STAUNTON VA 36-44 76-36 22 9.5 1951-80 30 SUFFOLK VA 38-41 77-46 500 20.9 1951-80 30 WARRENTON VA 37-59 76-46 140 17.3 1951-80 30 WARSAW VA 37-18 76-42 70 9.7 1951-80 30 WILLIAMSBURG VA 39-12 78-10 7 t>0 27.6 1951-80 30 WINCHESTER VA 38-53 78-31 887 l 26.2 1951-80 30 WOODSTOCK VA 37-20 79-12 921 18.5 1945-85 41 LYNCHBURG VA 37-30 77-20 164 14.5 1938-85 4S RICHNOND VA

& Y M M M M M M M M M M M M A M

& N .

^

SNOWFALL DATA Mean Annual Period of Number Snowfall Record of Latitude N Lon<3itude W Elevation EPHRATA PA 27.3 1951-80 30 40-10 76-10 485 FREELAND PA 53.7 1951-80 30 41-01 75-54 1900

~

GETTYSBURG PA 28.1 1951-80 30 39-50 77-14 500 HANOVER PA 32.5 1951-80 30 39-48 76-59 600 LEWISTOWN PA 29.9 1951-80 30 40-36 77-35 481 NONTGONERY PA 29.0 1951-80 30 40-39 80-23 692 NONTROSE PA 87.9 1951-80 30 41-50 75-52 1560 NEW PORT PA 31.8 1951-30 30 40-29 77-08 400 PALMERTON PA 32.8 1951-tC 30 40-48 75-37 410 PHOENIXVILLE PA 23.0 1951-bG 30 40-07 75-30 105 SHIPPENSBURG PA 38.6 1951-80 30 40-0) 77-31 680 PA 44.1 1951-80 30 41-00 75-11 480 STROUDSBURG TOWANDA PA 47.7 1951-80 30 41-45 76-25 745 WEST CHESTER PA 26.3 1951-80 30 39-58 75-38 450 YORK PA 32.8 1951-80 30 39-55 76-45 390 PHILADELPHIA PA 21.8 1943-85 43 39-53 75-15 5 HARRISBURG PA 35.2 1939-85 47 40-13 76-51 338 CENTRAL PARK NY 28.8 1869-85 117 40-47 73-58 132 JFK NY 24.4 1959-85 21 40-39 73-47 13 IA GUARDIA NY 26.0 1945-85 41 40-46 73-54 II ALBANY NY 65.1 1947-85 39 42-45 73-48 275 DOBBS FERRY HY 38.9 1951-80 30 41-01 73-52 240 GLENS FALLS NY 64.8 1951-80 30 43-21 73-37 321 GLOVERSVILLE NY 82.1 1951-80 30 43-02 74-21 760 LIBERTY NY 81.3 1951-80 30 41-48 74-45 1610

M M M M M M m m m aump -O E g if M iM IM M

~.

SNOWFALL DATA Mean Annual Period of Number Snowfall Record of Latitude N Longitude W Elevation City State (Inches) (Years) Years (Deg-Sec) (Deg-Sec) (Feet)

-_ _ = - - -

16.7 1951-80 30 38-54 75-28 30 MILFORD DE DE 15.3 1951-80 30 19-40 75-44 90 NEWARK 7G-36 74

~

WILMINGTON DE 20.9 1948-85 38 39-40 MD 21.5 1951-85 35 39-11 76-40 148 BWI 5 MD 15.4 1951-80 30 38-34 76-G9 CAMBRIDGE 40 MD 20.2 1951-80 30 39-13 76-04 CHESTERTOWN 76-57 90 COLLEGE PAR.4 MD 17.2 1951-E0 30 33-59 ,

34.2 1951-80 30 39-38 78-45 700 CUMBERLAND MD 15.6 1951-80 30 38-54 75-51 40 DENTCM MD 26.7 1951-GO 30 39-39 77-44 660 HAGERSTOWN .MD MD 30.5 1951-80 30 39-42 78-11 428 HANCOCK 77-00 140 LA PLATA MD 18.4 1951-80 30 38-32 MD 18.5 1951-80 30 39-06 7 (>-5 4 400 LAUREL 2420 MD 82.0 1951-80 30 39-24 79-24 OAKLAND 20 POCOMOKE MD 11.6 1951-80 30 38-O'4 75-33 12.5 1951-80 30 > -13 7S-41 27#

PRINCESS ANNE MD MD 21.1 1951-80 30 39-07 77-06 320 ROCKVILLE to MD 12.3 1951-80 30 38-22 75-35 SALISBURY 75-23 2n SHOW HILL MD 14.7 1951-80 30 38-14 DC 16.9 1944-85 42 38-51 77-02 19 NATIOHAL AIRPORT 77-27 2 *> 0 DULLAS AIRPORT DC 23.1 1963-85 23 38-57 PA 32.4 1944-85 42 40-39 75-24r 367 ALLENTOWN 465 PA 31.6 1951-80 30 40-13 77-12 CARLISLE 77-38 640 CHAMBERSBURG PA 3 2 . t> 1951-80 30 39-56 COATSVILLE PA 25.4 1951-80 30 39-Sa 77-50 142

M M M M M M M M M m 8 G & M M M M i SNOWFALL DATA 1

Mean Annual Period of Number Snowfall Record of Latitude N Longitude W Elevation City State (IncFes) (Years) Years (Deg-Sec) (Deg-Sec) (Feet)

NJ 1945-85 41 39-27 74-34 64 ATIANTIC CITY 16.4 75-05 275

. DELVIDERE HJ 31.5 1951-80 30 40-50 "

NJ 31.4 1951-80 30 40-54 74-24 280 BOONTON CAPE MAY NJ 15.4 1951-80 30 38-57 74-56 17 ESSEX FELLS HJ 32.2 1951-80 30 40-50 74-17 340 NJ 39.8 1951-80 30 40-31 74-51 140 FLEMINGTON

• FREEHOLD NJ 25.4 1951-80 30 40-16 74-15 194 l GLASSBORO NJ 17.5 1951-60 30 39-42 75-07 135 NJ 17.5 1951-80 30 39-39 74-48 85 HAMMONTON HIGHTSTONN NJ 27.3 1951-80 30 40-17 74-31 100 NJ 28.9 1951-80 30 40-44 74-04 135 JERSEY CITY NJ 24.6 1951-80 30 40-22 74-56 60 LAMBERTVILLE LONG BRANCH NJ 23.3 1951-80 30 40-19 74-01 15 ,

NJ 1951-80 30 39-22 75-04 61 MILLVILLE 16.5 NJ 36.1- 1951-80 30 40-50 74-30 400 MORRIS PIAINS -

NEWTON NJ 36.8 1951-80 30 41-03 74-45 565 NJ 28.1 1942-85 44 40-42 74-10 7 NENARK NJ 21.5 1951-80 30 39-58 74-38 80 PENBERTON PIAINFIELD NJ 30.6 1951-80 30 40-36 74-24 90 NJ 26.7 1951-80 30 40-36 74-38 160 SOMERVILLE NJ 39.8 1951-80 30 41-12 74-36 390 SUSSEX DE 17.5 1951-80 30 38-45 75-37 50 -

BRIDGEVILLE 30 DE 17.5 1951-80 30 39-09 75-31  !

DOVER GEORGETOWN DE 13.7 1951-80 30 38-38 75-27 45 DE 15.4 1951-80 30 38-46 75-09 20 LEWES

I I

APPENDIX !!

l Tornadoes within 125 Nautical Miles (NM) of Latitude 39.47N, Longitude 75.53W l .

i 1

• Denotes those tornadoes within the two-degree regtangle shown on Figure 3 2 l

1 l

8

I I

E l

[] .

9 0

p .

1 l..

-)

O Tornadoes Within 125 NM Radius of Latitude 39.47, Longitude 75.53 Beginning Ending I tatitude longitude Latitude Longitude Width Year Month Day Deg Min Deg Min Deg Min Deg Min (Feet) F l 5hhh 1950 S

7

[i 5

hh 40 hh 36 hh 76 hh 45 h~ 'i' .

40 2 l

1950 7 5 40 35 75 42 40 39 75 - 28 0 2  !

I 1950

• 1950 8

11 29 4

40 40 13 12 75 76 00 07 40 24 75 56 0

300 1

3  ;

1951 4 29 40 54 74 36 1200 1 1 1951 3 30 39 50 77 14 60 1 1 1952 4 5 39 27 77 33 150 1 1952 4 5 39 38 77 25 150 1 1

1952 4 5 39 - 07 75 45 100 l 1952 1952 8

4 31 5

39 40 01 38 77 74 13 19 39 02 77 14 210 100 0

1 1

1952 8 10 40 00 74 36 40 25 74 04 300 1 I

1952 4 5 39 48 76 59 39 57 76 43 0 3 1952 4 5 40 14 76 48 0 0 1952 4 5 41 07 75 17 0 1 1952 7 23 40 37 77 34 0 2 1 1952 8 16 40 37 76 43 90 1 1952 8 31 38 47 77 09 300 1 1953 5 26 38 46 76 54 600 1 1953 7 2 38 58 76 30 600 1 1953 5 23 40 39 76 32 80 1 1953 6 22 40 07 75 - 52 40 09 75 48 50 1 I 1953

• 1953 9

11 12 23 40 40 40 06 76 76 41 24 40 39 76 35 150 60 2

2 1953 5 17 38 52 77 51 38 52 77 44 0 1

• 1954 7 1 39 27 75 44 150 2 I- 1954 3 15 (0 44 77 32 10 0 l)S4 4 17 40 21 75 - 55 10 1 1954 4 25 39 50 77 - 14 39 48 '5 59 1500 I

2 1954 9 19 40 46 76 - 19 100 0 1954 6 26 37 56 76 52 0 0 1954 9 7 38 53 77 55 38 53 77 - 50 0 1 I 1954

• 1955 8

8 16 12 39 38 32 32 77 15 53 04 38 33 75 01 0

400 1

2 195'i 10 16 40 18 74 - 05 40 19 74 00 300 2 I

• 1955 1955

• 1956 3

8 5

22 19 6

39 39 58 40 - 24 15 75 - 37 77 74 23 50 40 03 75 - 28 1800 0

120 3

2 2 ,

1956 7 13 39 - 52 75 - 03 450 1

-l 1956 1956 7

9 13 6

39 41 58 03 14 42 74 - 06 450 0

1 2

1956 6 13 39 57 76 43 0 2 I

• 1956 1956 8

9 13 17 40 40 15 08 75 - 18 76 15 40 40 16 08 75 76 15 11 1000 150 2

.g .

O e

.o ..

9 Tornadoes Within 125 NH Radius of Latitude 39.47, longitude 75.53 Beginning Ending g Latitude longitude Latitude Longitude Width Year Month Day Deg Min Deg Hin Deg Min Deg Min (Feet) F I

1957 7 5 38 52 75 15 38 25 75 06 300 1 1957 9 10 38 44 75 36 450 1 1957 11 19 40 46 74 58 450 1 I 1957 1957 1957 4

8 9

28 15 1

40 40 40 04 37 49 76 75 76 34 29 52 20 0

0 1

0 0

I 1957 1957 1958 11 11 7

19 19 14 40 40 39 18 40 48 76 76 75 - 28 35 11 40 - 43 76 07 40 450 0

2 1

0 1958 5 4 38 - 12 75 - 25 150 I

1 1958 5 4 38 13 75 24 150 l

• 1958 13 40 09 74 42 40 6 11 74 39 450 2 1958 6 13 40 02 74 04 450 0 1958 39 - 57 75 - 00 39 - 59 74 - 05 I'

1998 1959 7

7 7 14 14 1

39 - 56 39 17 75 - 08 77 18 39 - 58 39 14 74 77 56 17 60 80 300 1

2 1

1959 7 19 39 31 76 07 150 2 8 1960 1960 11 4 26 19 39 39 08 26 76 77 39 12 90 100 1

1 1960 4 18 40 08 74 31 150 1 1960 6 24 40 16 74 - 46 40 - 15 74 31 600 0 1960 7 1 40 - 03 74 - 03 150 .1 1060 7 14 39 - 43 75 26 39 - 46 75 08 1350 2 1969 11 29 40 34 74 41 90 0 8

• 1960 6 24 40 24 75 37 40 19 75 28 600 2 i

• 1960 6 24 40 12 75 - 15 90 2 1960 7 4 41 - 20 75 - 44 0 2 E 1960 2 18 38 - 20 77 - 28 60 1 1961 4 28 39 40 15 34 90 3 1961 4 16 39 - 32 77 25 60 1 1961 6 9 39 12. 76 37 39 - 13 76 36 300 3 1 1961 7 13 39 04 76 39 1500 1 1961 7 04 39 - 42 77 37 39 - 43 77 - 35 1500 1 E 1961 4 16 40 - 03 77 31 330 3 4 1961 5 26 40 - 04 16 18 80 1 1961 6 8 40 12 75 27 600 2 1961 7 29 39 - 58 76 - 40 40 - 02 76 15 1500 2 8 1961 1961 9

7 13 3 40 - 18 39 19 75 78 00 12 40 20 74 57 30 0

1 2

1962 6 24 38 - 52 75 - 04 120 1 8 1962 1962 6 1 21 13 39 - 40 38 - 27 75 75 34 13 300 150 1

1 4 1962 6 24 38 - 31 75 - 45 50 0 1962 38 - 20

$ 1962 11 7 21 9

40 - 44 75 75 - 03 06 150 0

1 0

i i .

Tornadoes Within 125 NM Radius of Latitude 39.47, Longitude 75,53 Beginning Ending l Latitude longitude Latitude Longituce Width fear Month Day Deg Min Deg Min Ceg Min Ceg Min (Feet) F 1962 8 7 40 56 74 04 750 I 1962 1 27 41 04 76 13 600 2

1 1962 5 31 37 51 75 30 0 0 1963 7 19 39 28 77 23 39 - 31 77 07 1800 1 1 1963 7 19 38 46 76 46 150 1 1963 3 27 40 - 00 76 51 40 03 76 - 32 60 2 1963 4 21 40 21 75 55 450 1 1 1964 3 26 10 39 39 - 50 03 75 75 24 09 40 74 120 600 1

1964 3 12 10 1 1964 3 26 40 12 74 04 60 0 26 41 - 04 76 - 15 40 I 1964 1964 3

6 3 40 12 77 - 24 0 1

1 1964 6 15 40 25 76 29 2400 1 1965 8 1 39 - 03 76 - 03 600 1 1 1965 10 8 38 20 75 23 38 - 20 75 - 24 450 1 1965 8 26 40 76 51 0 1 1065 8 26 39 - 12 77 - 50 0 0 1- 1966 2 13 28 39 39 - 32 19 77 77 22 150 150 1

1966 6 19 1 1966 7 4 40 - 10 75 13 60 0 1966 11 2 37 - 58 76 45 0 3 1967 1 27 39 - 01 75 - 35 150 2 1967 8 27 39 - 48 75 27 150 0 1967 10 18 39 38 75 - 39 50 1 1 1967 10 18 39 - 41 75 - 36 50 1 1967 1 27 38 20 76 35 38 21 76 34 150 1 1967 7 28 38 - 43 76 - 18 38 - 46 76 - 17 60 1 1 1967 8 3 39 - 33 76 - 01 50 1 1967 8 26 39 - 09 77 - 16 300 1 1967 10 18 40 20 74 47 300 1 1967 9 21 40 - 25 77 - 11 90 2 1 1967 10 18 40 13 76 - 45 40 - 19 76 - 36 90 2 1967 5 7 37 - 37 75 - 48 60 1 1968 8 19 40 - 58 76 00 0 1 1 1968 9 10 40 - 58 75 58 0 2 1969 7 27 39 - 36 76 50 30 1 1969 7 27 40 - 04 76 - 42 300 2 1 1969 11 14 39 - 48 75 53 100 1 1969 8 10 37 49 76 - 23 70 0 1969 8 9 38 - 52 77 - 14 0 I

2 1970 7 15 40 - 55 73 55 150 2 1970 11 4 39 - 22 74 - 27 300 2 I 1970 73 30 230 9 27 40 42 2 I I 1970 1970 3

6 26 18 40 - 16 40 09 76 - 46 76 - 18 150 1200 2

1

)

i '

. . - . . . = -

l 4 Tornadoes Within 125 NH Radius of Latitude 39.47, t.ongitude 75.51 Beginning Ending g Latitude Longitude Latitude Longitude Width Year Month Day Ceg Min Deg Min Deg Min Deg Min (Feet) F l

l I

1979 9 5 40 21 75 48 0 0 90 2 i 1979 10 3 41 04 7( 38 41 05 76 35 90 1 1979 10 5 40 21 75 55 0 0 120 2 1979 10 5 40 - 35 75 44 0 0 60 0 1 1979 10 5 40 54 75 - 19 0 0 300 2 1979 10 5 41 06 75 15 0 0 240 1 1979 11 26 40 - 10 76 18 0 0 150 l

1 1979 11 26 40 21 76 23 0 0 150 0 1979 11 26 40 42 75 55 0 0 150 0 1979 9 5 38 20 77 03 0 0 120 2 1979 9 5 38 23 77 25 0 0 90 1 1 1979 9 5 38 47 77 05 39 00 77 16 900 3-1979 9 5 39 - 06 77 32 0 0 150 2 I 1979 1979 1979 10 9

7 20 2

5 39 39 39 08 26 26 77 77 78 30 50 06 39 29 0

0 77 58 0

0 90 0

0 2

0 1

1980 4 4 38 - 04 75 34 0 0 50 I

1

• 1980 6 29 39 31 76 10 0 0 450 2 1980 6 3 39 - 56 74 - 45 0 0 90 1 1980 4 9 40 - 44 77 19 40 43 77 17 20 2 1980 5 6 41 08 76 05 0 0 40 0 1980 6 7 40 01 77 04 40 02 76 57 240C ., 2 1980 6 7 39 - 56 77 01 0 0 1200 3 I 1980 1980 1980 6

7 5

16 24 7 40 - 08 39 37 - 33 57 76 - 13 75 - 37 76 32 0

0 0

0 0

0 120 150 80 1

1 1

1980 6 3 39 00 77 - 40 38 59 77 37 300 2 I

• 1981 1981 5

9 15 8

39 37 36 59 75 - 50 75 - 51 0

0 0

0 0

80 180 0

2 1

1981 6 21 40 04 74 12 0 1 g 1981 7 20 40 55 74 - 45 40 52 74 42 750 2 1981 10 26 40 52 74 - 53 0 0 1200 2 1981 4 29 40 - 49 75 - 35 0 0 0 2 3 1981 6 21 41 - 10 75 - 54 41 07 75 51 50 1 5 1981 7 20 40 - 51 '75 09 40 55 75 07 200 2 1981 7 26 40 52 76 - 15 0 0 0 2 1981 7 26 40 - 46 75 - 35 40 48 75 31 150 3 8 1981 1981 5

7 11 28 37 - 41 38 - 54 76 77 41 26 0

0 0

0 60 80 2

2 l 1982 5 30 39 - 38 77 30 0 0 50 1 i

I g 1982 1982 6

4 29 3

39 - 53 40 - 36 74 75 - 30 15 0 0

0 0

70 50 2

1 6

1982 4 17 41 - 12 76 24 41 15 76 21 90 2 1982 5 20 40 15 75 - 38 0 0 20 0 8 1982 6 29 40 - 06 74 54 0 0 40 1

^g

o -

Tornadoes Within 125 NH Radius of Latitude 39.47, t.or.gitude 75.53 Beginning Ending )

l LatitLde longitude Latitude 1.ongitude Width Year Month Day Deg Min Ceg Min De9 M19 Deg Min (Feet) F i

l

... ... ... ... ... ... ... ...... ... i

• 1983 7 21 39 10 75 43 60 1 1983 5 22 39 42 77 15 39 43 77 12 110 2

3 l

1983 10 13 38 22 76 34 38 25 76 32 110 2 i

i 1983 7 21 39 40 74 17 30 3 i 1983 3 21 40 13 75 05 40 18 74 59 150 1 l 1983 5 23 41 C6 76 46 41 07 76 44 90 1 1983 7 21 40 30 77 19 30 1 I

1 1983 8 11 40 43 75 34 40 39 75 20 450 1 i 1983 8 11 40 36 75 22 30 1 1983 8 29 41 12 75 25 30 0 1983 8 29 40 26 75 12 30 1 1 1983 8 31 37 58 76 46 180 2 1983 10 13 38 44 77 46 30 0 1983 10 13 38 51 77 18 50 0 1983 10 13 38 53 77 12 120 2

• 1,84 7 18 38 48 75 35 240 2 1984 5 8 38 22 76 47 38 - 23 76 44 240 1 1 1984 5 8 38 20 76 - 44 180 1 1984 5 8 38 30 76 31 50 0 1984 4 5 40 12 75 - 06 150 1

• 1984 7 5 40 26 75 49 40 29 75 40 900 2

• 1984 7 5 40 - 27 75 - 46 40 - 28 75 42 900 2 1984 7 5 40 29 75 42 40 31 75 32 900 2 I

• 1984 1984 1985 7

7 9 27 5

6 40 41 39 - 17 28 17 75 76 38 74 - 35 09 40 29 75 32 900 900 30 0 2

2 1985 10 5 40 31 74 24 40 - 40 74 13 230 1 I- 1985 1985 10 5 31 5 40 41 43 04 73 76 50 08 41 01 75 - 55 150 1590 1

1 19M S 31 41 11 75 26 50 1 1985 3 40 - 54 75 19 50 8 1985 6

7 14 40 42 75 30 1980 1

0 1985 7 31 40 11 77 01 40 09 76 - 59 60 1 1985 7 31 40 10 76 54 40 - 09 76 51 60 2 I 1985 7 31 40 04 75 12 60 1 i 1985 8 30 40 - 00 76 U9 100 1 1986 9 23 39 13 74 48 90 0 1986 7 13 41 14 76 44 41 - 28 76 34 300 1 1986 8 10 41 00 76 04 300 0 I 1986 8 2 39 02 78 07 39 - 04 78 .

04 150 i 1987 7 2 40 - 06 74 43 90 1 I 1987 7 12 39 - 53 74 - 55 30 1

} 1987 7 14 39 29 75 02 30 0

$ 1987 7 14 40 38 74 - 21 20 C 1 1987 7 14 40 26 74 28 20 0 e

~

...I,,

Tornadoes Within 125 NH Radius of Latitude 39,47, Longitude 75,5)

Beginnin9 Ending I Latitude Longitude Latitude t.onQitude Width Year Month Day Deg t4i n Oes Min De9 Min Deg Min (Feet) F I

• 1987 1987 7

7 21 26 39 40 21 59 74

• 35 74 57 300 30 2

0 1987 7 26 40 40 74 - 21 70 1 I 1987 1987 8

7 12 5 39 38 38 30 56 43 74 77 77 54 28 38 55 77 27 150 70 o

1 1987 7 21 31 150 o  ;

1954 5 3 39 17 77 38 39 20 I 1962 1978 5

8 24 28 40 39 19 48 74 77 57 02 40 39 17 34 77 74 - 37 76 37 47 200 0

60 0

1 2 l 1984 5 8 38 36 75 54 38 43 75 36 450 1 I 1984 5 8 38 34 75 54 38 43 75 36 300 1 l

I .

b I

I I

l -

I

I f

1 i 1

e $ e e b

Tornadoes Within 125 NH Radius of Latitude 39.47, Lon9itude 75.53 Beginning Ending g Latituce Longitude Latitude Longitude Width Year Month Day Deg Min Deg Min De9 Min Deg Min (Feet) F I

• 1983 1983 7

5 21 22 39 39 10 42 75 77 43 15 39 43 77 12 60 110 2

3 1963 10 13 38 22 76 34 38 26 76 32 110 2 I 1983 1983

.1983 7

3 5

21 21 23 39 40 41 40 13 06 74 75 76 17 05 46 40 18 74 59 30 150 3

1 41 07 76 44 90 1 1983 7 21 40 30 77 19 l 1983 1983 8

8 11 11 40 40 43 36 75 75 34 22 40 - 39 75 20 30 450 30 1

1 1

1983 8 29 41 12 75 25 30 0 1983 8 29 40 - 26 75 12 30 1 1983 8 31 37 58 76 46 180 1

2 1983 10 13 38 44 77 46 30 .0 I ISO 1983

• 1984 10 10 7

13 13 18 38 38 38 51 53 48 77 - 18 77 75 12 35 50 120 240 h

2 2

38 - 22 l 1984 1984 1984 5

5 5

8 8

8 38 38 26 30 76 76 76 47 44 31 38 - 23 76 - 44 240 180 50 0 1

1 1984 4 5 40 12 75 06 150 1 1984 7 5 40 - 26 75 49 40 29 75 - 40 900 2

• 1984 7 5 40 27 75 46 40 28 75 42 900 2 1984 7 5 40 - 29 75 42 40 - 31 75 - 32 900 2 a

I

• 1984 1984 1985 7

7 9 27 5

6 40 41 39 28 17 17 75 76 - 09 74 38 35 40 29 75 - 32 900 900 30 2

2 0

1985 40 - 31 74 - 24 74 - 13 l 10 40 40 230 5 1 1985 10 5 40 43 73 50 150 1 1985- 5 31 41 04 76 08 41 01 75 55 1590 1 1985 5 31 41 11 75 26 50 1 1985 6 40 54 75 50 8 1985 7 14 3

40 - 42 75 19 30 1980 0 1

1985 7 31 40 - 11 77 01 40 09 76 59 60 1 1985 7 31 40 - 10 76 54 40 09 76 51 60 2 4

1 1985 7 31 40 04 75 12 60 1

1985 8 30 40 00 76 09 100 1 1986 9 23 39 13 74 48 90 0

\

l 1986 1986 7 13 41 14 76 44 41 - 28 76 34 300 1 8 10 41 00 76 04 300 0 I 1986 8 2 39 02 78 07 39 04 78 04 150 1 1987 7 2 40 06 74 43 90 E 1987 7 12 39 53 74 55 30 1

1 1

1987 7 14 39 29 75 02 30 0

• e 1987 7 14 40 - 38 74 - 21 20 0 S 1987 7 14 40 26 74 28 20 0 s

m -

c ,

l..'

4 Tornadoes Within 125 NH Radius of Latitude 39.47, Longitude 75.53 Beginning Ending l Latitude Longi turie Latitude Longitude Width Year Month Day Ce9 Min Dag Min De9 Min Ceg Min (Feet) F

• 1979 l

• 1979 10 9 5 3

40 41 21 04 75 76 48 38 41 05 0

76 35 0 90 90 2

1 1979 10 5 40 21 75 55 0 0 120 2 1979 10 40 35 I 1979 1979 10 10 5

5 5

40 41 54 06 75 75 75 44 19 15 0

0 0

0 300 60 0 2

0 0 240 1 1979 11 26 40 10 76 18 0 0 150 1 1 1979 1979 11 11 26 26 40 40 21 42 76 75 23 55 0 0 150 0 0 0 150 0 1979 9 5 38 - 20 77 - 03 0 0 120 2 I 1979 1979 9

9 5

5 38 38 39 - 06 23 47 77 - 25 77 - 05 39 00 0

77 16 0

900 90 1 3

1979 9 5 77 32 0 0 150 2 1979 9 5 39 - 08 77 - 30 0 0 90 2 I~ 1979 7 20 39 - 26 77 56 0 0 0 0 1979 10 2 39 - 26 78 06 39 29 77 58 0 1 1980 4 4 38 04 75 34 0 0 50 1 1

• 1980 6 29 39 31 76 10 0 0 450 2 1980 6 3 39 - 56 74 - 45 0 0 90 1

, 1980 4 9 40 - 44 77 - 19 40 43 77 17 20 2 1980 5 6 41 - 08 76 05 0 0 40 0 1980 6 7 40 - 01 77 04 40 02 76 57 2400 .2 1980 6 7 39 - 56 77 - 01 0 0 1200 3 I 1980 1980 1980 6

7 5

16 24 7 40 39 37 - 33 08 57 76 - 13 75 76 - 32 37 0

0 0

0 0

0 120 150 80 1

1 1

1980 6 3 39 00 77 40 38 59 77 37 300 2

• 1981 5 15 39 36 75 - 50 0 0 80 2 1981 9 8 37 59 75 - 51 0 0 180 1 1981 6 21 40 - 04 74 12 0 0 0 1 1981 7 20 40 - 55 74 - 45 40 52 74 42 750 2 1 1981 10 26 40 52 74 - 53 0 0 1200 2 1981 4 29 40 - 49 75 - 35 0 0 0 2 g 1981 6 21 41 - 10 75 - 54 41 07 75 51 50 1 3 1981 7 20 40 51 '75 - 09 40 55 75 07 200 2 1981 7 26 40 - 52 76 - 15 0 0 0 2 1981 7 26 40 46 75 35 40 48 75 31 150 3 8 1981 1981 5

7 11 28 37 - 41 38 - 54 76 77 41 26 0

0 0

0 60 80 2

2 1982 5 30 39 - 38 77 - 30 0 0 50 1 74 - 15 70 8 1982 1982 6

4 29 3

39 40 - 36 53 75 - 30 0

0 0

0 50 2

1 i

1982 4 17 41 12 76 - 24 41 15 76 21 90 2 1982 20 40 - 15 75 38 0 0 20 0 8 1982 6 5

29 40 - 06 74 54 0 0 40 1 l ,

r hr Tornadoes Within 125 NM Radius of Latitude 39.47, Lon91tude 75.53 Beginning Ending l Latitude Longitude t.atitude Longitude Width Year Month Day Deg Min Deg Min Deg Min Oeg Min (Feet) F l [9hh 1976 h

6 hk 30 4h 40 hh 33 hh 75 bh SB 4h h4 hh bh hbb k 1976 7 29 40 160 1 06 76 29 1976 3 39 230 1 21 06 1 1976 7 15 37 40 78 76 09 35 90 0 1977 3 0 1 13 39 07 75 41 I 1977 1977 1977 6

8 8

10 17 9 39 39 39 - 32 02 48 74 75 75

?d 41 50 90 120 80 0 1

2 1977 240 0 I

3 1977 1977 8

9 4

10 26 5

39 40 40 - 15 15 22 75 74 76 00 31 50 40 27 74 28 80 200 0 0 0

1977 2 4 23 41 - 21 76 34 150 1977 1 I 6 1 40 - 45 75 27 150 1977 4 1 5 37 4's 75 45 4

1977 150 1 8 12 38 '41 77 17 g 1978 3 14 38 58 76 17 70 0 g 1978 4 18 38 56 75 - 52 50 1 1978 30 1 6 20 38 - 41 77 06 150 2 1978 6 27 38 - 42 76 40 38 37 76 35 150 2 1978 6 27 3e 44 76 16 80 1 1978 7 31 35 - 24 77 - 21 300 2 1978 7 31 39 18 77 04 120 2 1978 8 11 39 - 28 76 E 1978 8 12 40 - 46 73 35 28 150 0 0 0 1978 6 7 39 - 56 75 - 13 300 1 1978 8 7 40 50 75 57 40 52 75 52 0 0 E 1978 8 28 40 - 53 76 - $2 40 - 52 76 - 46 150 2 1978 8 28 40 - 32 75 47 60 1 1978 8 28 40 47 75 19 200 1 E 1978 1 26 38 - 30 77 18 750 3 1979 8 10 39 - 37 75 43 300 1

+ 1979 9 5 39 - 47 75 29 600 2 8 1979 1979 5

9 23 5

39 - 35 39 34 477 77 00 11 450 50 2

1 1979 9 5 39 - 00 76 39 150 1

• 1979 8 1979 9

9 5

5 39 39 - 39 27- 76 25 77 - 56 60 30 2

0 1979 9 3 .38 09 76 - 31 38 18 76 - 47 150 1 1979 9 5 38 - 19 76 26 90 lI 1979 1979 9

9 5

6 38 39 31 09 77 - 01 74 - 47 50 1

0 0 1 1979 11 26 39 - 31 75 14 0 1 1979 6 29 40 39 76 17 60 1

• 1979 9 5 39 46 75 44 39 - 48 75 - 48 190 2

- 1 3

1-  !

gv ,

Tornadoes Within 125 NH Radius of Latitude 39.47, 6engitude 75.53 Beginning Ending l Latitude longitude Latitude Longitude Width fear Month Day Deg Min Deg Min Deg Min Deg Min (Feet) F I 1975 1975 1975 3

4 19 3

38 39 39 44 10 27 75 75 12 32 30 0

1 1

7 14 75 46 0 0 I 1975 38 8 4 43 75 17 160 0 1975 8 4 39 15 75 38 90 0 1975 5 6 38 50 76 13 0 1 1975 6 5 38 - 32 76 53 0 0 1975 6 13 39 29 77 07 l 1975 7 3 39 14 76 51 0 1 0 0 1975 7 13 38 31 77 01 600 1 1975 7 13 39 36 75 50 300 1 I 1975 7 14 39 02 76 30 300 1 1975 / 14 39 20 76 03 0 0 1975 7 24 39 41 77 53 150 1 5 1975 1975 8 4 38 39 16 75 47 ' 230 1 4 3 29 75 08 30 0 1975 7 13 39 - 30 75 - 13 230 2 1975 7 13 40 54 74 03 450 l

• 1975 4 3 40 02 75 - 40 40 - 05 75 39 60 2 1

1975 6 19 41 - 03 75 58 0 1 1975 7 13 40 10 74 51 0 1 1975 7 24 40 44 76 06 0 .0 1975 8 26 40 - 47 76 42 0 0

• 1975 10 11 40 - 17 76 29 40 10 76 11 100  ?

E 1975 11 10 40 - 33 76 28 40 1 1975 3 24 38 02 77 26 600 1 1975 4 25 37 50 76 - 38 0 2 1975 7 17 38 04 76 36 90 0 l 1975 8 4 39 14 78 02 300 2 1975 9 6 37 - 42 76 31 31 42 76 28 450 1 1976 3 21 39 - 40 75 - 34 30 0 E 1976 6 30 38 46 75 - 09 0 0 1976 3 21 39 44 76 - 02 100 1

• 1976 3 21 39 13 75 - 56 ~ 300 2 5 1976 1976 4

8 25 14 39 - 42 39 00 77 76 00 39 100 0

1 1

1976 7 7 40 40 74 07 40 - 43 74 05 150 1 l- 1976 1976 6

3 21 1 40 - 45 39 - 58 73 - 30 77 35 150 0 0 0

1976 3 21 39 56 77 15 150 2 1976 3 21 40 - 12 77 08 40 - 11 77 02 270 1 1976 3 21 40 - 11 77 07 40 - 10 77 03 210 0

, 1976 3 21 39 51 78 45 150 1 1976 3 21 40 - 38 75 28 40 - 38 75 20 150 1 1976 3 21 40 59 75 11 300 3 b

~ ^ ~

.. )

9 l?

] Tornadoes Within 125 NM Radias of Latitude 39.47. Longitude 75,53 Beginning Ending l Latitude Lon91tude Latitude tengitude Width Year Month Oay De9 Min Deg Min Deg Min Deg Min (Feet) F l

• 1970 6 18 40 24 76 18 40 24 76 14 2640 3 1970 7 2 40 - 09 76 37 5280 2

• 1971 7 30 39 04 76 03 39 08 75 $5 900 2 I 1971 1971 1971 9

7 7

12 19 19 38 40 40 53 54 50 76 74 74 53 24 07 38 54 76 49 600 2400 1200 2

1 1

• 1971 27 38 - $5 74 I

8 56 39 19 74 47 120 2 1971 8 11 40 57 73 42 100 1 1971 9 16 39 45 77 26 0 1 1972 3 3 39 - 25 77 25 300 1 l

1972 1973 9

6 13 28 41 - 09 39 38 44 75 75 24 44 300 0

2 0

1973 4 1- 37 76 55 60 1 I 1973 1973 1973 6

6 2

16 16 2

39 - 20 39 40 32 36 76 76 - 12 74 35 52 39 33 76 11 300 0

0 2

1 2

74 - 48 I 1973 1973 1973 2

2 5 28 2

2 40 40 - 40 40 35 48 74 - 58 74 30 400 400 150 1

3 1

. 1973 5 28 40 51 74 - 43 150 3 1973 6 29 40 - 42 74 16 70 1 1973 6 29 40 46 74 - 15 100 1 1973 11 28 39 38 75 18 0 0 1973 9 18 40 - 39 73 - 30 40 - 40 73 27 500 2 E 1973 5 10 41 14 76 59 200 1 1973 5 28 40 30 75 40 40 30 75 36 300 1 1973 6 28 39 - 40 76 *5 0 1 E 1973 6 28 39 40 76 - 35 0 1 1973 6 29 40 40 75 - 20 0 1

• 1973 6 29 39 - 56 75 29 39 54 75 27 190 2

• 1973 6 29 40 14 75 - 02 40 15 74 59 300 2 1973 11 28 40 - 07 75 - 35 0 0 1973 4 1 38 - 48 77 20 38 - 52 77 10 300 3 1973 10 2 37 42 75 45 0 2 E'

1974 1 28 38 - 32 '77 - 00 50 1 1974 5 12 39 - 06 77 00 200 1 1974 5 12 39 - 06 76 36 100 1 8 1974 1974 8

4 23 14 38 - 06 40 - 49 75 74 25 50 180 300 1

2 1974 7 24 39 - 48 74 - 12 150 1 1974 9 1 40 55 73 51 150 1

- 1974 7 29 39 56 77 - 34 60 1 1974 8 4 39 45 75 - 52 90 1

• 1974 8 17 39 - 57' 76 - 06 100 2 1974 8 17 37 - 31 75 - 56 50 1

.8 .*

i Tornadoes Within '.!$ NH Radius of 1.atitude 39.47, Longitude 75.53 l

Beginning l Ending Latitude longitude Latitude Longitude Width fear Month Day Deg Min Deg Min Deg Min Deg Min (Feet) F I

• 1987 1987 7

7 21 26 39 40 21 59 74 74 35 57 300 30 2

0 1987 7 26 40 40 74 21 70 1 I 1987 1987 8

7 12 5 39 38 30 56 74 77 54 28 38 55 77 27 150 70 0

1  !

1987 7 21 38 43 77

• 31 150 0 l 1954 3 39 17 77 38 39 I 20 77 37 5 0 0 j 1962 5 24 40 19 74 57 40 17 74 37 200 1  :

1978 8 28 39 48 77 - 02 39 34 76 47 60 2 i 1984 5 8 38 36 75 54 38 43 75 - 36 450 l

1 1984 5 8 38 34 75 54 38 43 75 36 300 1 i E '

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