WATCHES: Tornado Watch Number 929

WWUS20 KWNS 101828
SEL9
SPC WW 101828
OKZ000-TXZ000-110100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 929
NWS STORM PREDICTION CENTER NORMAN OK
1225 PM CST MON NOV 10 2008

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

EXTREME SOUTHWEST OKLAHOMA
CENTRAL AND NORTHWEST TEXAS

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 1225 PM UNTIL
700 PM CST.

TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE
MILES EAST AND WEST OF A LINE FROM 20 MILES NORTHWEST OF WICHITA
FALLS TEXAS TO 40 MILES EAST SOUTHEAST OF JUNCTION TEXAS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU9).

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...THUNDERSTORMS ARE BEGINNING TO DEVELOP ACROSS CENTRAL
TX WHERE LOW-LEVEL MOISTENING AND SURFACE HEATING HAVE ERODED
CONVECTIVE INHIBITION...AND ADDITIONAL THUNDERSTORM DEVELOPMENT
APPEARS LIKELY DURING THE AFTERNOON ALONG THE WARM FRONT AND DRYLINE
NEAR THE RED RIVER IN NW TX. THOUGH MID LEVEL LAPSE RATES ARE NOT
PARTICULARLY STEEP AND CLOUDS HAVE LIMITED SURFACE HEATING THUS
FAR...GRADUAL MOISTENING AND CLOUD BREAKS W OF I-35 SHOULD ALLOW
SUFFICIENT DESTABILIZATION IN THE WARM SECTOR TO SUPPORT A SEVERE
STORM THREAT. MLCAPE VALUES OF 500-1500 J/KG AND STRONG
LOW-LEVEL/DEEP LAYER SHEAR WILL SUPPORT SUPERCELLS CAPABLE OF
PRODUCING A FEW TORNADOES...ALONG WITH AT LEAST ISOLATED LARGE HAIL
AND DAMAGING WINDS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
450. MEAN STORM MOTION VECTOR 25030.

...THOMPSON

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