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191 

WWUS20 KWNS 091718

SEL1

SPC WW 091718

MDZ000-NCZ000-VAZ000-CWZ000-100100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 281

NWS STORM PREDICTION CENTER NORMAN OK

120 PM EDT SAT MAY 9 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF SOUTHERN MARYLAND

       MUCH OF CENTRAL AND WESTERN NORTH CAROLINA

       PARTS OF CENTRAL AND SOUTHERN VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 120 PM UNTIL

900 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 80

STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES WEST

SOUTHWEST OF CHARLOTTE NORTH CAROLINA TO 25 MILES WEST NORTHWEST

OF PATUXENT RIVER MARYLAND.  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.



OTHER WATCH INFORMATION...CONTINUE...WW 280...



DISCUSSION...FULL HEATING HAS DEVELOPED A MODERATELY UNSTABLE AIR

MASS EAST OF MOUNTAINS. WITH 30-40KT OF SHEAR...THUNDERSTORMS WILL

DEVELOP INITIALLY E OF HIGHER TERRAIN AND MOVE INTO MORE UNSTABLE

AIR MASS ACROSS THE WATCH.  PRIMARY THREAT WILL BE DAMAGING WINDS

AND HAIL...WITH POTENTIAL FOR MORE SIGNIFICANT SEVERE ASSOCIATED

WITH ANY SUPERCELL THAT COULD DEVELOP.



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 24025.





...HALES

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