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WWUS20 KWNS 051002

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SPC WW 051002

IAZ000-ILZ000-WIZ000-LMZ000-051600-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 458

NWS STORM PREDICTION CENTER NORMAN OK

500 AM CDT THU JUN 5 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EASTERN IOWA

       NORTHWEST ILLINOIS

       SOUTHERN WISCONSIN

       LAKE MICHIGAN



EFFECTIVE THIS THURSDAY MORNING FROM 500 AM UNTIL 1100 AM CDT.



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 65 STATUTE

MILES EAST AND WEST OF A LINE FROM 50 MILES EAST SOUTHEAST OF

OTTUMWA IOWA TO 60 MILES NORTH OF MILWAUKEE WISCONSIN.  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...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 457. WATCH NUMBER 457 WILL NOT BE IN EFFECT AFTER

500 AM CDT.



DISCUSSION...LONG-LIVED...BROADLY-ROTATING STORM CLUSTERS SHOULD

PERSIST IN AREA OF SUSTAINED WAA ALONG AND ATOP STALLING OUTFLOW

BOUNDARY FROM ERN IA NEWD INTO WI.  QUALITY OF MOISTURE

INFLOW...COUPLED WITH MODERATE LOW-LVL SPEED/DIRECTIONAL

SHEAR...SUGGESTS POTENTIAL FOR A TORNADO OR TWO...IN ADDITION TO

LOCALLY DMGG OUTFLOW WINDS.



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 500.

MEAN STORM MOTION VECTOR 24030.





...CORFIDI

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