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WWUS20 KWNS 142025

SEL4

SPC WW 142025

INZ000-KYZ000-OHZ000-TNZ000-150400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 614

NWS STORM PREDICTION CENTER NORMAN OK

425 PM EDT SAT AUG 14 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN INDIANA

       KENTUCKY

       SOUTHERN OHIO

       NORTHWEST AND NORTHERN MIDDLE TENNESSEE



EFFECTIVE THIS SATURDAY AFTERNOON FROM 425 PM UNTIL MIDNIGHT 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 50

STATUTE MILES EITHER SIDE OF A LINE FROM 65 MILES SOUTHWEST OF

CLARKSVILLE TENNESSEE TO 35 MILES NORTH NORTHEAST OF ATHENS OHIO.

 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...SW-NE ORIENTED BAND OF TSTMS SHOULD CONTINUE TO

INCREASE IN COVERAGE AND INTENSITY THIS AFTERNOON AS GROWING

STORM-SCALE COLD POOLS INTERACT WITH A HOT...MOIST AND UNSTABLE AIR

MASS WITH MLCAPE OF 3000-4000 J/KG.  WHILE VERTICAL SHEAR IS NOT

PARTICULARLY STRONG...THE FAVORABLE THERMODYNAMIC ENVIRONMENT WILL

FAVOR STRONG DOWNDRAFT DEVELOPMENT WITH THE RISK FOR DAMAGING WINDS

THROUGH THIS EVENING.



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 27025.





...MEAD

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