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WWUS20 KWNS 230436

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SPC WW 230436

INZ000-MIZ000-OHZ000-LEZ000-LMZ000-231100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 520

NWS STORM PREDICTION CENTER NORMAN OK

1235 AM EDT FRI JUL 23 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       FAR NORTHERN INDIANA

       MUCH OF SOUTHERN LOWER MICHIGAN

       NORTHWEST OHIO

       LAKE ERIE

       LAKE MICHIGAN



EFFECTIVE THIS FRIDAY MORNING FROM 1235 AM UNTIL 700 AM EDT.



TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 45 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 40 MILES SOUTH OF MUSKEGON

MICHIGAN TO 30 MILES NORTH NORTHEAST OF MANSFIELD OHIO.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU0).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 518. WATCH NUMBER 518 WILL NOT BE IN EFFECT AFTER

1235 AM EDT. CONTINUE...WW 519...



DISCUSSION...W-E ORIENTED BAND OF TSTMS /WITH EMBEDDED SUPERCELLS/

IS EXPECTED TO GRADUALLY MOVE/DEVELOP MORE SEWD WITH TIME ALONG AN

OUTFLOW BOUNDARY/WARM FRONT RETREATING NWD THROUGH NRN IND/OH INTO

SRN LOWER MI.  AIR MASS ALONG AND S OF THIS BOUNDARY REMAINS QUITE

WARM AND VERY MOIST WITH DEWPOINTS IN THE LOW/MID 70S F.  WHEN

COUPLED WITH THE STRONG LOW-LEVEL SHEAR IN PLACE...ENVIRONMENT WILL

REMAIN SUPPORTIVE OF LOW-LEVEL MESOCYCLONE DEVELOPMENT/SUSTENANCE

WITH THE THREAT FOR A FEW TORNADOES IN ADDITION TO DAMAGING WIND

GUSTS.



AVIATION...TORNADOES AND 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

500. MEAN STORM MOTION VECTOR 29030.





...MEAD

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