

000 

WWUS20 KWNS 271840

SEL7

SPC WW 271840

INZ000-KYZ000-OHZ000-WVZ000-280200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 557

NWS STORM PREDICTION CENTER NORMAN OK

235 PM EDT FRI JUL 27 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EXTREME SOUTHERN INDIANA

       MOST OF KENTUCKY

       SOUTHERN OHIO

       WESTERN WEST VIRGINIA



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 235 PM UNTIL

1000 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 70

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 10 MILES SOUTH OF

HUNTINGTON WEST VIRGINIA TO 30 MILES WEST SOUTHWEST OF OWENSBORO

KENTUCKY.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 555...WW 556...



DISCUSSION...UPPER LEVEL IMPULSE OVER NRN IL WILL MOVE SEWD

THROUGHOUT THE AFTERNOON...WITH RESULTANT LARGE SCALE LIFT SPREADING

ACROSS THE WW AREA. ALTHOUGH MLCAPE VALUES ARE ONLY AROUND 1000

J/KG... STRENGTHENING MID LEVEL WINDS WILL PROVIDE SUFFICIENT SHEAR

FOR STRONG UPDRAFTS. THE VERTICAL WIND PROFILES SUPPORT MORE OF A

WIND THAN HAIL THREAT...ESPECIALLY IF 1 OR 2 ORGANIZED CLUSTER OF

STORMS DEVELOP LATER IN 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 500. MEAN STORM

MOTION VECTOR 27025.





...IMY

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