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WWUS20 KWNS 032256

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IAZ000-ILZ000-MOZ000-WIZ000-040500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 82

NWS STORM PREDICTION CENTER NORMAN OK

600 PM CDT SUN APR 3 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EASTERN IOWA

       WESTERN AND NORTHERN ILLINOIS

       EXTREME NORTHEAST MISSOURI

       FAR SOUTHERN WISCONSIN



EFFECTIVE THIS SUNDAY NIGHT FROM 600 PM UNTIL MIDNIGHT CDT.



TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 75 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE

MILES EAST AND WEST OF A LINE FROM 45 MILES SOUTH SOUTHEAST OF

OTTUMWA IOWA TO 35 MILES EAST NORTHEAST OF DUBUQUE IOWA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU2).



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...THUNDERSTORMS HAVE BEGUN TO FORM ALONG THE COLD FRONT

OVER IA.  THESE STORMS ARE EXPECTED TO INCREASE IN COVERAGE AND

INTENSITY THROUGH THE EVENING HOURS AND SPREAD INTO WESTERN IL.

LARGE HAIL AND DAMAGING WINDS ARE THE MAIN THREATS.  HOWEVER...THE

POTENTIAL EXISTS FOR ISOLATED TORNADOES ESPECIALLY NEAR THE SURFACE

WARM FRONT OVER NORTHERN IL OR PERHAPS FAR SOUTHERN WI.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 26040.





...HART

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