

929 

WWUS20 KWNS 311333

SEL7

SPC WW 311333

ARZ000-ILZ000-MOZ000-312100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 767

NWS STORM PREDICTION CENTER NORMAN OK

730 AM CST FRI DEC 31 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHERN ARKANSAS

       WEST CENTRAL ILLINOIS

       SOUTHERN...CENTRAL...AND EASTERN MISSOURI



EFFECTIVE THIS FRIDAY MORNING AND AFTERNOON FROM 730 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 80 STATUTE

MILES EAST AND WEST OF A LINE FROM 50 MILES NORTHWEST OF SAINT

LOUIS MISSOURI TO 20 MILES WEST OF RUSSELLVILLE ARKANSAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU7).



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 765...



DISCUSSION...SCTD TSTMS EXPECTED TO CONTINUE ALONG AND AHEAD OF

EWD-MOVING COLD FRONT NOW OVER WRN MO/ERN OK AS LARGE SCALE ASCENT

ASSOCIATED WITH NEG TILT SHORTWAVE IMPULSE CONTINUES NE ACROSS

REGION.  WHILE SFC-BASED INSTABILITY WILL BE WEAK...STRENGTH OF

SHEAR...CONTINUED MOIST INFLOW...AND CONVERGENCE ALONG

FRONT/EXISTING OUTFLOW BOUNDARIES SUGGEST POSSIBILITY FOR A FEW

SUSTAINED STORMS AND POSSIBLY A COUPLE SUPERCELLS.  THESE COULD

YIELD BRIEF TORNADOES AND LOCALLY DMGG WIND.



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 24050.





...CORFIDI

