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000 

WWUS20 KWNS 160235

SEL0

SPC WW 160235

INZ000-OHZ000-LMZ000-160800-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 600

NWS STORM PREDICTION CENTER NORMAN OK

1030 PM EDT WED AUG 15 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHERN INDIANA

       NORTHWEST OHIO

       LAKE MICHIGAN



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 1030 PM

UNTIL 400 AM EDT.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

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



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 40 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 20 MILES SOUTH SOUTHWEST OF

VALPARAISO INDIANA TO 65 MILES EAST OF FORT WAYNE INDIANA.  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.



DISCUSSION...SMALL MCS OVER NW IND HAS FORMED IN THE PAST 90 MINUTES

ON WRN SIDE OF COLD POOL/MCV ASSOCIATED WITH EARLIER CONVECTIVE

SYSTEM.  THE MCS  SHOULD REMAIN STRONG THROUGH EARLY THURSDAY AND

TRACK ESE INTO OH.  A SUPERCELL NOW PRESENT ON WRN SIDE OF SYSTEM

WILL POSE A THREAT FOR ISOLATED TORNADOES...IN ADDITION TO DAMAGING

WET MICROBURSTS/ MARGINALLY SVR HAIL...GIVEN HI PWS AND LOW LEVEL

WIND FIELD WITH CONSIDERABLE DEGREE OF SPEED/DIRECTIONAL SHEAR.

WIND PROFILES MAY ALSO SUPPORT BACK-BUILDING DEVELOPMENT ON WRN SIDE

OF MCS...WITH ASSOCIATED LOCALLY HEAVY RAIN POSSIBLE INTO FAR NE

IL/NRN IND IN WAKE OF SUPERCELL.



AVIATION...TORNADOES AND 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 30030.





...CORFIDI

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