

153 

WWUS20 KWNS 211536

SEL7

SPC WW 211536

NJZ000-NYZ000-PAZ000-CWZ000-220000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 727

NWS STORM PREDICTION CENTER NORMAN OK

1130 AM EDT FRI AUG 21 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NEW JERSEY

       EXTREME SOUTHEAST NEW YORK

       EASTERN PENNSYLVANIA

       COASTAL WATERS



EFFECTIVE THIS FRIDAY MORNING AND EVENING FROM 1130 AM UNTIL 800

PM EDT.



HAIL TO 1.5 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 70

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

ALLENTOWN PENNSYLVANIA TO 30 MILES WEST OF WILMINGTON DELAWARE.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 726...



DISCUSSION...STORMS ACROSS E-CNTRL PA ARE EXPECTED TO INTENSIFY AS

THEY DEVELOP EWD INTO THE DESTABILIZING WARM SECTOR WHERE 2000-2500

MLCAPE IS LIKELY THIS AFTERNOON. OTHER STORMS MAY DEVELOP IN WARM

SECTOR WHERE ONLY A WEAK CAP EXISTS. BULK SHEAR OF 40-45 KT WILL

SUPPORT BOWING SEGMENTS AND SUPERCELLS WITH DAMAGING WIND THE MAIN

THREAT. HOWEVER...ISOLATED HAIL AND A TORNADO OR TWO ARE ALSO

POSSIBLE.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 24035.





...DIAL

