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WWUS20 KWNS 060214

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INZ000-MIZ000-OHZ000-LEZ000-060900-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 268

NWS STORM PREDICTION CENTER NORMAN OK

1010 PM EDT SAT JUN 5 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL AND NORTHERN INDIANA

       EXTREME SOUTHERN LOWER MICHIGAN

       WEST CENTRAL AND NORTHWEST OHIO

       LAKE ERIE



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 1010 PM

UNTIL 500 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 75 STATUTE

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

LAFAYETTE INDIANA TO 20 MILES SOUTHEAST OF FINDLAY OHIO.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU8).



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...CONTINUE...WW 266...WW 267...



DISCUSSION...ISOLATED SUPERCELLS ARE DEVELOPING ALONG A RESIDUAL

RAIN-COOLED BOUNDARY/WARM FRONT ACROSS NE INDIANA AND NW OH...WHERE

LOW-LEVEL MOISTURE AND SHEAR ARE MAXIMIZED.  THESE STORMS WILL BE

CAPABLE OF PRODUCING TORNADOES...ALONG WITH AT LEAST ISOLATED

DAMAGING WINDS AND LARGE HAIL.  LATER TONIGHT...THE THREAT FOR

SUPERCELLS AND EMBEDDED BOWS WILL INCREASE FROM W TO E AS THE

SURFACE LOW AND COLD FRONT WILL MOVE EWD FROM IL TO INDIANA/WRN OH

AND LOWER MI.  THE COMBINATION OF MODERATE SURFACE-BASED

INSTABILITY...BOUNDARY LAYER DEWPOINTS OF 68-70 F...AND EFFECTIVE

SRH OF 250-300 M2/S2 IN THE PRESENCE OF DISCRETE STORMS COULD

SUPPORT AN ISOLATED STRONG TORNADO.



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 27035.





...THOMPSON

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