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667 

WWUS20 KWNS 231141

SEL4

SPC WW 231141

INZ000-MIZ000-OHZ000-LEZ000-LHZ000-LMZ000-231900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 394

NWS STORM PREDICTION CENTER NORMAN OK

740 AM EDT WED JUN 23 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN INDIANA

       SOUTHERN AND CENTRAL LOWER MICHIGAN

       NORTHWEST OHIO

       LAKE ERIE

       LAKE HURON

       LAKE MICHIGAN



EFFECTIVE THIS WEDNESDAY MORNING AND AFTERNOON FROM 740 AM UNTIL

300 PM EDT.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 105

STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH

NORTHWEST OF SAGINAW MICHIGAN TO 65 MILES EAST SOUTHEAST OF SOUTH

BEND INDIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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 391...WW 392...WW 393...



DISCUSSION...BOW MCS NOW OVER LK MI EXPECTED TO CONTINUE EWD.  MCS

MAY INTENSIFY GIVEN STRENGTH OF ASSOCIATED WIND FIELD /PER MKX VWP/

AND EXPECTED SFC HEATING AHEAD OF IT.  DMGG WIND SHOULD BE MAIN SVR

THREAT...ALTHOUGH RISK FOR ISOLD TORNADOES MAY INCREASE WITH AS

BOUNDARY LAYER WARMS AND MOISTENS LATER TODAY.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 27040.





...CORFIDI

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