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088 

WWUS20 KWNS 271654

SEL8

SPC WW 271654

DCZ000-MDZ000-NYZ000-PAZ000-VAZ000-WVZ000-CWZ000-280000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 388

NWS STORM PREDICTION CENTER NORMAN OK

1255 PM EDT FRI MAY 27 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       DISTRICT OF COLUMBIA

       CENTRAL MARYLAND

       CENTRAL NEW YORK

       CENTRAL AND EASTERN PENNSYLVANIA

       NORTHERN VIRGINIA

       EASTERN WEST VIRGINIA PANHANDLE

       COASTAL WATERS



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 1255 PM UNTIL

800 PM EDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75

STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES SOUTH OF

CHARLOTTESVILLE VIRGINIA TO 50 MILES NORTHEAST OF ITHACA NEW

YORK.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH

AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR

THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS

AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



OTHER WATCH INFORMATION...CONTINUE...WW 387...



DISCUSSION...SCATTERED THUNDERSTORMS WILL FORM THIS AFTERNOON IN

CORRIDOR OF MODERATE INSTABILITY FROM NORTHERN VA INTO PORTIONS OF

PA/NY.  RATHER STRONG MID LEVEL WINDS AND STEEP LOW/MID LEVEL LAPSE

RATES WILL PROMOTE ORGANIZED STORMS INCLUDING A FEW SUPERCELLS.

LOCALLY DAMAGING WINDS AND HAIL ARE THE MAIN THREATS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 23035.





...HART

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