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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 628

NWS STORM PREDICTION CENTER NORMAN OK

1140 AM EDT FRI SEP 7 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF CENTRAL AND NORTHERN INDIANA

       WEST CENTRAL AND NORTHWEST OHIO



EFFECTIVE THIS FRIDAY MORNING AND EVENING FROM 1140 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 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES EAST

SOUTHEAST OF FINDLAY OHIO TO 20 MILES NORTHWEST OF TERRE HAUTE

INDIANA.  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...CONVECTION IS EXPECTED TO INTENSIFY ACROSS NRN INDIANA

ALONG AN OUTFLOW BOUNDARY AND SPREAD EWD INTO W/NW OH THIS

AFTERNOON...WITH ADDITIONAL DEVELOPMENT EXPECTED LATER AND FARTHER

SW ON THE BOUNDARY INTO CENTRAL INDIANA.  GIVEN 0-6 KM BULK SHEAR IN

EXCESS OF 30 KT AND MLCAPE OF 2000-2500 J/KG...ORGANIZED CONVECTIVE

CLUSTERS/LINE SEGMENTS ARE EXPECTED WITH AN ATTENDANT RISK FOR

DAMAGING WINDS AND ISOLATED LARGE HAIL 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 27035.





...THOMPSON

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