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WWUS20 KWNS 182224

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SPC WW 182224

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 660

NWS STORM PREDICTION CENTER NORMAN OK

625 PM EDT MON JUL 18 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN OHIO

       CENTRAL WEST VIRGINIA



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 625 PM UNTIL

100 AM 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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 65 MILES WEST

SOUTHWEST OF COLUMBUS OHIO TO 25 MILES NORTHEAST OF ELKINS WEST

VIRGINIA.  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.



OTHER WATCH INFORMATION...CONTINUE...WW 657...WW 658...WW 659...



DISCUSSION...SCATTERED THUNDERSTORMS OVER OH WILL SPREAD

SOUTHEASTWARD THROUGH THE EVENING AND ACROSS THE WATCH AREA.  HIGH

BOUNDARY-LAYER THETA-E AND STEEP LOW LEVEL LAPSE RATES...COUPLED

WITH SUFFICIENT FLOW ALOFT WILL PROMOTE A RISK OF LOCALLY DAMAGING

WIND GUSTS IN THE STRONGER CELLS.



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 31030.





...HART

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