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WWUS20 KWNS 301810

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SPC WW 301810

IAZ000-ILZ000-WIZ000-LMZ000-010100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 113

NWS STORM PREDICTION CENTER NORMAN OK

105 PM CDT FRI APR 30 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EASTERN IOWA

       NORTHWESTERN ILLINOIS

       SOUTHERN AND EASTERN WISCONSIN

       LAKE MICHIGAN



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 105 PM UNTIL 800

PM CDT.



TORNADOES...HAIL TO 2 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 70 STATUTE

MILES EAST AND WEST OF A LINE FROM 30 MILES NORTHWEST OF GREEN

BAY WISCONSIN TO 40 MILES EAST OF BURLINGTON IOWA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU3).



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 111...WW 112...



DISCUSSION...STRONG UPPER FORCING WILL OVERSPREAD THE AREA THIS

AFTERNOON... WITH THUNDERSTORMS EXPECTED TO INCREASE IN NUMBER AND

INTENSITY FROM SOUTHWEST TO NORTHEAST ACROSS THE WW. A WARMING AND

MOISTENING BOUNDARY LAYER HAS RESULTED IN MODERATE INSTABILITY...

AND IN CONJUNCTION WITH 50 KT OF DEEP LAYER SHEAR...SUPERCELLS ARE

EXPECTED. STRONG LOW LEVEL SHEAR WILL SUPPORT A THREAT FOR

TORNADOES...AND THE STRONG FLOW ALOFT WILL FAVOR FAST MOVING BOW

ECHOES WITH WIND DAMAGE.



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

SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 23050.





...IMY

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