

000 

WWUS20 KWNS 312216

SEL2

SPC WW 312216

ILZ000-WIZ000-010500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 102

NWS STORM PREDICTION CENTER NORMAN OK

515 PM CDT SAT MAR 31 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL AND NORTHERN ILLINOIS

       SOUTHERN WISCONSIN



EFFECTIVE THIS SATURDAY AFTERNOON FROM 515 PM UNTIL MIDNIGHT CDT.



TORNADOES...HAIL TO 1.5 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 55 STATUTE

MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH NORTHEAST OF

LONEROCK WISCONSIN TO 30 MILES SOUTHWEST OF DECATUR ILLINOIS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 100...WW 101...



DISCUSSION...ERN IA/NE MO SQLN WITH EMBEDDED SUPERCELLS SHOULD

CONTINUE SLOWLY E AS STORMS MOVE RAPIDLY NNE ALONG IT.  AS POTENT

NEG TILT UPR VORT NOW NEAR OMA CONTINUES TO EJECT NEWD...EXPECT

STRONG...LARGELY UNIDIRECTIONAL WIND PROFILES TO SPREAD E ACROSS

IL/SRN WI IN TANDEM WITH SQLN.  WHILE SFC-BASED INSTABILITY WILL

DECREASE WITH NIGHTFALL...SUFFICIENT CAPE SHOULD REMAIN PRESENT TO

SUPPORT ADDITIONAL STORM  DEVELOPMENT ALONG LINE.  ENHANCED

POTENTIAL FOR LOW LEVEL ROTATION/SPIN-UP TORNADOES WILL EXIST NEAR

LEWPS/CUSPS ALONG LINE...AND WITH ANY ISOLATED CELLS FORMING ALONG

STRENGTHENING LLJ AHEAD OF IT.



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

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

450. MEAN STORM MOTION VECTOR 22040.





...CORFIDI

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