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WWUS20 KWNS 041436

SEL6

SPC WW 041436

INZ000-MIZ000-OHZ000-042000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 566

NWS STORM PREDICTION CENTER NORMAN OK

1040 AM EDT WED AUG 4 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHEAST INDIANA

       SOUTH CENTRAL LOWER MICHIGAN

       NORTHWEST INTO CENTRAL OHIO



EFFECTIVE THIS WEDNESDAY MORNING AND AFTERNOON FROM 1040 AM UNTIL

400 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 55

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

NORTHWEST OF FORT WAYNE INDIANA TO 35 MILES SOUTH SOUTHEAST OF

MANSFIELD OHIO.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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...MCS OVER NE INDIANA WILL LIKELY PERSIST INTO EARLY

AFTERNOON AS THE LOW LEVELS DESTABILIZE IN ADVANCE OF THE

STORMS...AND NEW CONVECTION FORMS ALONG THE SRN FLANK OF THE MCS.

THE COMBINATION OF STRONG INSTABILITY AND 35-50 KT LOW-MIDLEVEL FLOW

INTO THE REAR OF THE CONVECTIVE SYSTEM SHOULD MAINTAIN A THREAT FOR

DAMAGING WINDS AND ISOLATED LARGE HAIL.



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.





...THOMPSON

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