WATCHES: Severe Thunderstorm Watch Number 682

WWUS20 KWNS 161151
SEL2
SPC WW 161151
LAZ000-TXZ000-CWZ000-161900-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 682
NWS STORM PREDICTION CENTER NORMAN OK
550 AM CST SUN DEC 16 2012

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

WESTERN...CENTRAL AND NORTHERN LOUISIANA
SOUTHEAST AND EAST TEXAS
COASTAL WATERS

EFFECTIVE THIS SUNDAY MORNING AND AFTERNOON FROM 550 AM UNTIL 100
PM CST.

HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 80 MILES SOUTHWEST
OF COLLEGE STATION TEXAS TO 40 MILES NORTH NORTHEAST OF NATCHEZ
MISSISSIPPI. 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.

DISCUSSION...TSTMS FCST TO CONTINUE INCREASING IN COVERAGE AND
SPREAD FROM W-E ACROSS WW AREA...WHILE STRENGTHENING TO SVR LEVELS.
STG MID-UPPER WINDS -- E.G. 90 KT OBSERVED AROUND 6 KM AGL OVER LDB
PROFILER SITE -- WILL CONTRIBUTE TO FAVORABLE DEEP-LAYER SHEAR.
MEAN-WIND AND DEEP-SHEAR VECTORS WILL BE ALIGNED NEARLY PARALLEL TO
LOW-LEVEL FRONTAL/CONVERGENCE ZONE...SUPPORTING PREDOMINANT
QUASI-LINEAR AND CLUSTERED MODES...WITH LEWPS AND SMALL BOWS
POSSIBLE.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
MOTION VECTOR 24035.


...EDWARDS

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