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198 

WWUS20 KWNS 250128

SEL0

SPC WW 250128

ILZ000-INZ000-250700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 100

NWS STORM PREDICTION CENTER NORMAN OK

830 PM CDT SAT APR 24 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHEAST ILLINOIS

       WESTERN AND CENTRAL INDIANA



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 830 PM

UNTIL 200 AM CDT.



TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 60 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE

MILES EAST AND WEST OF A LINE FROM 60 MILES NORTHWEST OF

LAFAYETTE INDIANA TO 40 MILES SOUTH OF BLOOMINGTON INDIANA.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 96...WW 97...WW 98...WW

99...



DISCUSSION...TSTMS MAY CONTINUE TO FORM ALONG LOBE OF ASCENT/MID LVL

COOLING MOVING NEWD IN ERN QUADRANT OF DEEPENING CYCLONE NEAR STL.

STRENGTH OF LOW LVL SHEAR AND PRESENCE OF BACKED FLOW NEAR DIFFUSE

W/E STNRY FRONT IN NRN IL/IND SUGGEST A CONDITIONAL POTENTIAL FOR

ISOLD TORNADOES WITH ANY SUSTAINED UPDRAFTS.



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

SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 50 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

350. MEAN STORM MOTION VECTOR 19035.





...CORFIDI

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