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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 633

NWS STORM PREDICTION CENTER NORMAN OK

720 PM EDT MON JUL 11 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN AND CENTRAL INDIANA

       WESTERN OHIO



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 720 PM UNTIL

300 AM EDT.



HAIL TO 2 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 40

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES WEST

NORTHWEST OF LAFAYETTE INDIANA TO 30 MILES EAST OF DAYTON OHIO.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 628...WW 629...WW

630...WW 631...WW 632...



DISCUSSION...TSTMS ARE RAPIDLY DEVELOPING ALONG A W-E ORIENTED

PRE-FRONTAL CONFLUENCE ZONE WITHIN A HOT AND VERY MOIST AIR MASS

WHERE MLCAPE HAS INCREASED TO 2500-3500+ J/KG.  MOREOVER...CURRENT

PROFILER DATA FROM NWRN IND SHOW A BELT OF 50 KT WNWLY WINDS IN THE

3-6 KM AGL LAYER WHICH IS RESULTING IN MORE THAN SUFFICIENT

DEEP-LAYER SHEAR FOR ORGANIZED STORMS INCLUDING SUPERCELLS.  WSWLY

LOW-LEVEL INFLOW SHOULD ALLOW STORMS TO PROGRESS SEWD THROUGH PARTS

OF WRN/SWRN OH THIS EVENING WHERE AIR MASS HAS BEEN RECENTLY

OVERTURNED BY A LONG-LIVED BOWING MCS.  LARGE HAIL AND DAMAGING

WINDS WILL BE THE PRIMARY HAZARDS WITH THE MOST INTENSE STORMS.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM

MOTION VECTOR 29035.





...MEAD

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