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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 268

NWS STORM PREDICTION CENTER NORMAN OK

115 PM EDT TUE MAY 10 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       MUCH OF CENTRAL AND SOUTHERN INDIANA

       MUCH OF CENTRAL AND EASTERN KENTUCKY

       PARTS OF SOUTHERN OHIO

       PARTS OF WESTERN WEST VIRGINIA



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 115 PM UNTIL

800 PM EDT.



HAIL TO 3 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 90

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES WEST OF

BLOOMINGTON INDIANA TO 55 MILES SOUTHEAST OF HUNTINGTON WEST

VIRGINIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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...AIR MASS ACROSS THE WATCH AREA HAS BECOME STRONGLY

UNSTABLE WITH MLCAPES AOA 3000 J/K WITH LITTLE REMAINING CINH.

VEERING SHEAR PROFILES WILL SUPPORT SEVERE THUNDERSTORMS...INCLUDING

SUPERCELLS DEVELOPING ACROSS THE WATCH THRU THE AFTERNOON.  IN

ADDITION TO VERY LARGE HAIL..DAMAGING WINDS WILL BE LIKELY AS STORMS

DEVELOP UPSCALE INTO SHORT LINE SEGMENTS AND CLUSTERS.



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

TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 29025.





...HALES

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