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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 571

NWS STORM PREDICTION CENTER NORMAN OK

705 PM EDT WED AUG 4 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHERN INDIANA

       NORTHEASTERN KENTUCKY

       WEST CENTRAL AND SOUTHWEST OHIO



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 705 PM

UNTIL 200 AM 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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES NORTHWEST

OF TERRE HAUTE INDIANA TO 45 MILES SOUTH OF COLUMBUS OHIO.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU1).



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 567...WW 568...WW

569...WW 570...



DISCUSSION...MCS NOW ORGANIZING IN E CNTRL IL/W CNTRL IND EXPECTED

TO MOVE MAINLY ESE THROUGH LATE EVE.  WIND PROFILES APPEAR

SUPPORTIVE OF BOTH FORWARD-PROPAGATING SEGMENTS...AND

BACK-BUILDING/REGENERATIVE STORMS.  FORWARD-DEVELOPING STORMS MAY

ORGANIZE INTO SMALL BOWS WITH DMGG WIND...GIVEN HI PW AND LIKELY

NOCTURNAL INCREASE IN WSWLY LLJ.  MARGINALLY SVR HAIL ALSO MAY

OCCUR...ESPECIALLY WITH BACK-BUILDING CELLS.



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 28035.





...CORFIDI

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