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044 

WWUS20 KWNS 311634

SEL8

SPC WW 311634

ILZ000-312100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 768

NWS STORM PREDICTION CENTER NORMAN OK

1035 AM CST FRI DEC 31 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL ILLINOIS



EFFECTIVE THIS FRIDAY MORNING AND AFTERNOON FROM 1035 AM UNTIL

300 PM CST.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

TO 70 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 50 MILES SOUTHWEST OF

SPRINGFIELD ILLINOIS TO 15 MILES NORTHWEST OF BLOOMINGTON

ILLINOIS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 767...



DISCUSSION...SEVERE TSTMS INCLUDING SUPERCELLS ONGOING OVER NERN MO

ARE EXPECTED TO MOVE/DEVELOP NEWD TODAY INTO AREA ALONG AND S OF

WARM FRONT/RESIDUAL OUTFLOW BOUNDARY.  WHILE WIDESPREAD CLOUDS WILL

LIMIT DESTABILIZATION...A RELATIVELY MOIST BOUNDARY LAYER AND STRONG

DYNAMIC FORCING FOR ASCENT WILL BE SUFFICIENT TO SUSTAIN LOW-TOPPED

TSTM ACTIVITY.  GIVEN THE STRONG SHEAR ALREADY IN PLACE /REF.

CURRENT ILX VWP/...SETUP WILL FAVOR SUPERCELLS CAPABLE OF DAMAGING

WINDS...HAIL AND A FEW TORNADOES.



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

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400.

MEAN STORM MOTION VECTOR 23035.





...MEAD

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