WATCHES: Tornado Watch Number 73

WWUS20 KWNS 212109
SEL3
SPC WW 212109
TXZ000-220400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 73
NWS STORM PREDICTION CENTER NORMAN OK
410 PM CDT WED APR 21 2010

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

THE SOUTHERN TEXAS PANHANDLE AND TEXAS SOUTH PLAINS

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 410 PM UNTIL
1100 PM CDT.

TORNADOES...HAIL TO 2 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 75 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 75 MILES WEST NORTHWEST OF
PLAINVIEW TEXAS TO 15 MILES SOUTHEAST OF CHILDRESS TEXAS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU3).

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 72...

DISCUSSION...SURFACE HEATING/MIXING HAS REMOVED MUCH OF THE
CONVECTIVE INHIBITION ALONG A STALLED FRONT...AND THUNDERSTORM
DEVELOPMENT WILL BE POSSIBLE IN THE NEXT COUPLE OF HOURS ALONG THE
FRONT AND IMMEDIATELY NE OF A WEAK MESOLOW NW OF LBB. MODERATE
INSTABILITY IS PRESENT ALONG THE BOUNDARY...AND DEEP-LAYER VERTICAL
SHEAR IS SUFFICIENT FOR SUPERCELLS. THE PRIMARY INITIAL THREAT WILL
BE LARGE HAIL...THOUGH A COUPLE OF TORNADOES WILL ALSO BE POSSIBLE
TOWARD EVENING AS LOW-LEVEL MOISTURE AND SHEAR CONTINUE TO INCREASE
GRADUALLY.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 28015.

..THOMPSON

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