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IAZ000-ILZ000-WIZ000-230700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 519

NWS STORM PREDICTION CENTER NORMAN OK

855 PM CDT THU JUL 22 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PART OF EAST-CENTRAL IOWA

       NORTHERN ILLINOIS

       FAR SOUTHERN WISCONSIN



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 855 PM

UNTIL 200 AM 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 30 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 70 MILES WEST OF DUBUQUE

IOWA TO 25 MILES SOUTH OF RACINE WISCONSIN.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU9).



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 514. WATCH NUMBER 514 WILL NOT BE IN EFFECT AFTER

855 PM CDT. CONTINUE...WW 515...WW 517...WW 518...



DISCUSSION...TSTMS ARE EXPECTED TO REMAIN FOCUSED ALONG A W-E

ORIENTED BAROCLINIC ZONE WHERE A SWLY 35-45 KT LLJ WILL ENHANCE DEEP

CONVERGENCE.  THE COMBINATION OF A VERY MOIST/UNSTABLE BOUNDARY

LAYER AND MODERATE TO STRONG LOW-LEVEL SHEAR WILL REMAIN SUPPORTIVE

OF LOW-LEVEL MESOCYCLONE DEVELOPMENT WITH THE THREAT FOR A FEW

TORNADOES IN ADDITION TO LOCALLY DAMAGING WIND GUSTS.



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 28025.





...MEAD

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