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623 

WWUS20 KWNS 212244

SEL5

SPC WW 212244

ILZ000-INZ000-WIZ000-LMZ000-220600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 535

NWS STORM PREDICTION CENTER NORMAN OK

545 PM CDT TUE JUN 21 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND NORTHERN ILLINOIS

       NORTHWEST INDIANA

       SOUTHERN WISCONSIN

       LAKE MICHIGAN



EFFECTIVE THIS TUESDAY AFTERNOON AND WEDNESDAY MORNING FROM 545

PM UNTIL 100 AM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES WEST

NORTHWEST OF MILWAUKEE WISCONSIN TO 10 MILES EAST SOUTHEAST OF

BLOOMINGTON ILLINOIS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



OTHER WATCH INFORMATION...CONTINUE...WW 531...WW 532...WW

533...WW 534...



DISCUSSION...TSTMS EXPECTED TO CONTINUE MOVING AND DEVELOPING NNEWD

ACROSS CNTRL/NRN IL THIS EVE IN ZONE OF MODEST LARGE SCALE ASCENT

AHEAD OF VORT LOBE ROTATING NNE TOWARD THE MID/UPR MS VLY.  MODERATE

LARGELY UNIDIRECTIONAL SSW FLOW...SIZABLE SBCAPE...AND MOIST LOW LVL

ENVIRONMENT SUGGEST POTENTIAL FOR CLUSTERS/BANDS OF SUSTAINED

STORMS/POSSIBLE SUPERCELLS WITH SVR HAIL/WIND AND POSSIBLY A BRIEF

TORNADO.



AVIATION...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 550. MEAN STORM

MOTION VECTOR 21030.





...CORFIDI

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