

299 

WWUS20 KWNS 241817

SEL7

SPC WW 241817

IAZ000-ILZ000-WIZ000-242200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 617

NWS STORM PREDICTION CENTER NORMAN OK

110 PM CDT FRI JUL 24 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EASTERN IOWA

       EXTREME NORTHWEST ILLINOIS

       EXTREME SOUTHWEST WISCONSIN



EFFECTIVE THIS FRIDAY AFTERNOON FROM 110 PM UNTIL 500 PM CDT.



TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 45 STATUTE

MILES EITHER SIDE OF A LINE FROM 35 MILES WEST SOUTHWEST OF

MOLINE ILLINOIS TO 65 MILES NORTH NORTHWEST OF DUBUQUE IOWA.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 616...



DISCUSSION...A VERY LARGE AND INTENSE SUPERCELL WAS LOCATED IN NERN

IA AND IS EXPECTED TO TRACK SSEWD THROUGH THE AFTERNOON. STRONG LOW

LEVEL SHEAR AS WELL AS A WARMING AND DESTABILIZING BOUNDARY LAYER

MAY SUPPORT A TORNADO THREAT WITH THIS LONG LIVED SUPERCELL. HAIL 3

INCHES OR LARGER IN SIZE AND WINDS IN EXCESS OF 70 MPH ARE ALSO

ANTICIPATED.



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

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 33030.





...IMY

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