

889 

WWUS20 KWNS 232039

SEL2

SPC WW 232039

ILZ000-INZ000-240200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 102

NWS STORM PREDICTION CENTER NORMAN OK

440 PM EDT FRI MAR 23 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHEAST ILLINOIS

       NORTHWEST AND CENTRAL INDIANA



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 440 PM UNTIL

1000 PM EDT.



HAIL TO 1.5 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 45

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 65 MILES NORTHWEST

OF DANVILLE ILLINOIS TO 20 MILES NORTHEAST OF INDIANAPOLIS

INDIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 101...



DISCUSSION...STRONG/SEVERE STORMS ARE MOVING NEWD TOWARD NERN IL AND

WEST CENTRAL IN AT THIS TIME...ON THE LEADING EDGE OF DYNAMIC

FORCING ASSOCIATED WITH A COLD UPPER LOW MOVING EWD OVER ERN MO.

SATELLITE IMAGERY INDICATES AN ARC OF CLEARING IN ADVANCE OF THE

STORMS WHICH IS ALLOWING HEATING/DESTABILIZATION TO OCCUR IN THE

DOWNSTREAM ENVIRONMENT.  POTENTIAL FOR LARGE HAIL AND DAMAGING WIND

GUSTS WILL CONTINUE WITH THESE STORMS INTO THE EVENING HOURS.



AVIATION...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 400. MEAN STORM

MOTION VECTOR 21035.





...WEISS

