

882 

WWUS20 KWNS 311824

SEL5

SPC WW 311824

MDZ000-NCZ000-VAZ000-CWZ000-010100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 645

NWS STORM PREDICTION CENTER NORMAN OK

225 PM EDT FRI JUL 31 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       MARYLAND EASTERN SHORE

       CENTRAL INTO PART OF EASTERN NORTH CAROLINA

       CENTRAL AND SOUTHEAST VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 225 PM UNTIL 900

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 15 MILES NORTH

NORTHEAST OF PATUXENT RIVER MARYLAND TO 20 MILES SOUTHEAST OF

SOUTHERN PINES NORTH CAROLINA.  FOR A COMPLETE DEPICTION OF THE

WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 644...



DISCUSSION...THUNDERSTORMS WILL INCREASE IN COVERAGE AND INTENSITY

WITHIN AXIS OF MODERATE INSTABILITY AND STRONG SHEAR ACROSS WW THIS

AFTERNOON AND EVENING.  ACTIVITY WILL LIKELY EVOLVE IN THE FORM OF

FAST MOVING LINES/CLUSTERS...AND EVEN A FEW SUPERCELLS.  ALTHOUGH AN

ISOLATED TORNADO REMAINS POSSIBLE...MAIN SEVERE THREAT WILL LIKELY

BE FROM DAMAGING WINDS.  HAIL AND HEAVY RAINFALL CAN ALSO BE

EXPECTED WITH THE STRONGER CORES.



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 25030.





...EVANS

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