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WWUS20 KWNS 051440

SEL4

SPC WW 051440

KYZ000-OHZ000-VAZ000-WVZ000-052200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 574

NWS STORM PREDICTION CENTER NORMAN OK

1040 AM EDT THU AUG 5 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND EASTERN KENTUCKY

       SOUTHERN OHIO

       EXTREME WESTERN VIRGINIA

       CENTRAL AND SOUTHERN WEST VIRGINIA



EFFECTIVE THIS THURSDAY MORNING AND EVENING FROM 1040 AM UNTIL

600 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 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES WEST

NORTHWEST OF BOWLING GREEN KENTUCKY TO 60 MILES NORTH NORTHEAST

OF WHITE SULPHUR SPRINGS WEST VIRGINIA.  FOR A COMPLETE DEPICTION

OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS

WOU4).



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...THUNDERSTORMS ARE ONGOING IMMEDIATELY IN ADVANCE OF A

SURFACE COLD FRONT THAT IS MOVING SEWD NEAR THE OH RIVER.  STRONG

SURFACE HEATING IN ADVANCE OF THE FRONT WILL REDUCE CONVECTIVE

INHIBITION THROUGH MIDDAY-EARLY AFTERNOON AND CONTRIBUTE TO MLCAPE

VALUES INCREASING TO AOA 3000 J/KG...ALLOWING ADDITIONAL

THUNDERSTORM DEVELOPMENT/INTENSIFICATION.  MODEST LOW-MIDLEVEL WLY

FLOW OF ABOUT 30 KT WILL SUPPORT ORGANIZED CLUSTERS/LINE SEGMENTS

WITH PRIMARY THREAT FOR DAMAGING WINDS THROUGH THE AFTERNOON.



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 550. MEAN STORM

MOTION VECTOR 28030.





...THOMPSON

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