WATCHES: Tornado Watch Number 200

WWUS20 KWNS 300051
SEL0
SPC WW 300051
TXZ000-300800-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 200
NWS STORM PREDICTION CENTER NORMAN OK
745 PM CDT SUN APR 29 2007

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

SOUTHWEST TEXAS

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 745 PM UNTIL
300 AM CDT.

TORNADOES...HAIL TO 3 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 55 STATUTE
MILES EITHER SIDE OF A LINE FROM 20 MILES SOUTH SOUTHWEST OF
HONDO TEXAS TO 60 MILES NORTHWEST OF DRYDEN TEXAS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU0).

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...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 198. WATCH NUMBER 198 WILL NOT BE IN EFFECT AFTER
745 PM CDT. CONTINUE...WW 199...

DISCUSSION...WARM/MOIST AND VERY UNSTABLE AIR MASS FROM THE
TRANS-PECOS REGION SEWD ALONG THE RIO GRANDE VALLEY AND SRN EDGE OF
THE EDWARDS PLATEAU IS EXPECTED TO SUPPORT A CONTINUATION OF STRONG
TO SEVERE TSTMS TONIGHT. THIS ACTIVITY WILL BE FURTHER SUSTAINED AS
LARGE SCALE DIFFLUENCE...AHEAD OF AN UPPER LOW...SPREADS EWD ATOP
THE UNSTABLE WARM SECTOR. LOW LEVEL SELY FLOW TOPPED BY
STRENGTHENING WLY FLOW ALOFT WILL CONTRIBUTE TO SHEAR PROFILES
FAVORABLE FOR SUPERCELLS WITH LARGE HAIL. TORNADO POTENTIAL WILL
ALSO EXIST GIVEN ABUNDANT LOW LEVEL MOISTURE AND LOW LEVEL
DIRECTIONAL SHEAR.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 23020.

..CARBIN/HART

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