

591 

WWUS20 KWNS 310825

SEL6

SPC WW 310825

ILZ000-MOZ000-311400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 766

NWS STORM PREDICTION CENTER NORMAN OK

220 AM CST FRI DEC 31 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       A SMALL PART OF WEST CENTRAL ILLINOIS

       EAST CENTRAL MISSOURI



EFFECTIVE THIS FRIDAY MORNING FROM 220 AM UNTIL 800 AM CST.



HAIL TO 1 INCH 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 55

STATUTE MILES EAST AND WEST OF A LINE FROM 10 MILES WEST

NORTHWEST OF ALTON ILLINOIS TO 25 MILES SOUTH SOUTHWEST OF VICHY

MISSOURI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 765...



DISCUSSION...PAIR OF LONG-LIVED STORMS/SUPERCELLS IN CNTRL MO...WITH

A HISTORY OF WIND DMG...MAY REMAIN STRONG ENOUGH TO POSE A CONTINUED

THREAT FOR DAMAGING WIND AND POSSIBLY A BRIEF TORNADO AS THEY

CONTINUE NE TOWARD THE ST LOUIS METRO.  ACTIVITY APPEARS TO BE TIED

TO LEAD UPR IMPULSE ACCELERATING NE AHEAD OF MAIN UPR TROUGH NOW

OVER CNTRL OK....AND SHOULD DIMINISH AS THE IMPULSE FURTHER OUTRUNS

LOW LVL MOISTURE AXIS.



AVIATION...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 24040.





...CORFIDI

