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563 

WWUS20 KWNS 281722

SEL5

SPC WW 281722

INZ000-MIZ000-OHZ000-LEZ000-290000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 545

NWS STORM PREDICTION CENTER NORMAN OK

120 PM EDT WED JUL 28 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF NORTHERN INDIANA

       PARTS OF SOUTHERN LOWER MICHIGAN

       NORTHERN OHIO

       LAKE ERIE



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 120 PM UNTIL

800 PM EDT.



HAIL TO 1 INCH 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 5 MILES SOUTH OF

SOUTH BEND INDIANA TO 60 MILES NORTH OF YOUNGSTOWN OHIO.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU5).



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...WITH THE AIR MASS VERY MOIST/UNSTABLE AND VIRTUALLY

UNCAPPED...THUNDERSTORMS ARE DEVELOPING ALONG/AHEAD OF COLD FRONT

ACROSS SRN LM.  STORMS WILL FORM INTO SHORT LINES UNDER 30-40KT OF

SHEAR ENHANCING WIND DAMAGE POTENTIAL AS THEY MOVE EWD ACROSS WATCH.

ADDITIONAL STRONG/SEVERE STORMS WILL LIKELY FORM ON LAKE BREEZE

FRONT ACROSS NRN OH AHEAD OF THE MI ACTIVITY.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM MOTION

VECTOR 27030.





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