WW 686 TORNADO AR KS MO OK TX 200135Z – 200800Z
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 686
NWS STORM PREDICTION CENTER NORMAN OK
735 PM CST WED DEC 19 2012
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
WESTERN ARKANSAS
EXTREME SOUTHEAST KANSAS
SOUTHWEST MISSOURI
EASTERN OKLAHOMA
EXTREME NORTHEAST TEXAS
EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 735 PM
UNTIL 200 AM 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 70 STATUTE
MILES EAST AND WEST OF A LINE FROM 15 MILES NORTH NORTHEAST OF
SPRINGFIELD MISSOURI TO 5 MILES EAST SOUTHEAST OF PARIS TEXAS.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU6).
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.
DISCUSSION...STORMS ARE INTENSIFYING ALONG A DRY LINE FROM SOUTH
CENTRAL OK INTO FAR NORTH-CENTRAL TX...WITH LESS-ORGANIZED
CONVECTION DEVELOPING OVER NERN OK. STORMS ARE LIKELY TO INCREASE
TONIGHT AS A STRONG COLD FRONT OVERTAKES THE DRY LINE AND BEGINS TO
SURGE EWD ACROSS THE AREA. STRONG DYNAMIC FORCING FOR ASCENT
ASSOCIATED WITH AN INTENSE UPPER TROUGH MOVING INTO THE CENTRAL
PLAINS WILL ENHANCE FORCED LIFT ALONG THE COLD FRONT SUPPORTIVE OF
ADDITIONAL STRONG/SEVERE STORM DEVELOPMENT. STRENGTHENING WINDS
ALOFT/DEEP LAYER SHEAR AND CLOCKWISE TURNING LOW-LEVEL HODOGRAPHS
FAVOR EMBEDDED SUPERCELL/QLCS STRUCTURES WITH DAMAGING WINDS AND
SEVERAL TORNADOES POSSIBLE TONIGHT.
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 23045.
...WEISS
via SPC Forecast Products http://www.spc.noaa.gov/products/watch/ww0686.html
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