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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 610

NWS STORM PREDICTION CENTER NORMAN OK

155 PM EDT FRI JUL 8 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CONNECTICUT

       DISTRICT OF COLUMBIA

       DELAWARE

       MARYLAND

       NEW JERSEY

       SOUTHEAST NEW YORK

       EASTERN PENNSYLVANIA

       NORTHERN AND CENTRAL VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 155 PM UNTIL 900

PM EDT.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 65

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 85

STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH

NORTHEAST OF POUGHKEEPSIE NEW YORK TO 35 MILES SOUTH SOUTHEAST OF

WASHINGTON DISTRICT OF COLUMBIA.  FOR A COMPLETE DEPICTION OF THE

WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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.



DISCUSSION...CLUSTERS OF THUNDERSTORMS ARE EXPECTED TO CONTINUE

DEVELOPING AND INTENSIFY THIS AFTERNOON IN ADVANCE OF A SHORT WAVE

TROUGH MOVING EWD TOWARD THE MID ATLANTIC REGION.  AIR MASS IS VERY

MOIST WITH SURFACE DEW POINTS IN THE LOW 70S...AND DIABATIC HEATING

HAS RESULTED IN DESTABILIZATION WITH MLCAPE OF 1500 J/KG.  SWLY MID

LEVEL WINDS OF 30-40 KT ARE CONTRIBUTING TO SUFFICIENT VERTICAL

SHEAR TO ENHANCE THREAT FOR SEVERE STORMS.  LOCALIZED DAMAGING WIND

GUSTS AND HAIL WILL BE THE PRIMARY THREATS.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 55

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 23025.





...WEISS

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