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WWUS20 KWNS 221904

SEL7

SPC WW 221904

ILZ000-INZ000-WIZ000-LMZ000-230300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 327

NWS STORM PREDICTION CENTER NORMAN OK

205 PM CDT SUN MAY 22 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHERN ILLINOIS

       NORTHWEST INDIANA

       CENTRAL AND EASTERN WISCONSIN

       LAKE MICHIGAN



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 205 PM UNTIL

1000 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 45 MILES NORTHEAST OF WAUSAU

WISCONSIN TO BLOOMINGTON ILLINOIS.  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 322...WW 323...WW

324...WW 325...WW 326...



DISCUSSION...TSTMS ARE EXPECTED TO MOVE INTO THE AREA FROM THE WEST

AND SOUTH THIS AFTERNOON AS THE CONTINUED WARMING AND MOISTENING OF

THE BOUNDARY LAYER SUPPORTS MLCAPE VALUES OF 1000-2000 J/KG.  18Z

DVN/ILX SOUNDINGS SHOWED DEEP-LAYER SHEAR OF AROUND 40 KT AND

EFFECTIVE SRH VALUES OF 150-200 M2/S2.  AS SUCH...THE POTENTIAL WILL

EXIST FOR SUPERCELLS CAPABLE OF LARGE HAIL...DAMAGING WINDS AND

TORNADOES.



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 24030.





...MEAD

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