

896 

WWUS20 KWNS 221812

SEL1

SPC WW 221812

MDZ000-NCZ000-VAZ000-CWZ000-222300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 731

NWS STORM PREDICTION CENTER NORMAN OK

210 PM EDT SAT AUG 22 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN MARYLAND

       NORTHEASTERN NORTH CAROLINA

       EASTERN VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 210 PM UNTIL

700 PM EDT.



HAIL TO 1 INCH 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 10 MILES NORTH

NORTHEAST OF PATUXENT RIVER MARYLAND TO 10 MILES SOUTH SOUTHEAST

OF ELIZABETH CITY NORTH CAROLINA.  FOR A COMPLETE DEPICTION OF

THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS

WOU1).



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...COMPLEX OF STORMS WITH EMBEDDED MID LEVEL CIRCULATIONS

WILL CONTINUE TO TRACK EAST-NORTHEASTWARD THROUGH THE AFTERNOON.

MODERATE INSTABILITY AND 30-35 KT OF DEEP LAYER SHEAR SHOULD SUSTAIN

BOWING SEGMENTS SOUTH OF THE MID LEVEL CIRCULATIONS...WITH WIND

DAMAGE THE PRIMARY THREAT.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

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

VECTOR 24025.





...IMY

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