SEL9
SPC WW 292156
TXZ000-300400-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 199
NWS STORM PREDICTION CENTER NORMAN OK
500 PM CDT SUN APR 29 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
WEST CENTRAL AND NORTHWEST TEXAS
EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 500 PM UNTIL
1100 PM CDT.
HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55
STATUTE MILES EITHER SIDE OF A LINE FROM 55 MILES SOUTHWEST OF
SAN ANGELO TEXAS TO 45 MILES NORTHWEST OF WICHITA FALLS TEXAS.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU9).
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.
OTHER WATCH INFORMATION...CONTINUE...WW 198...
DISCUSSION...THUNDERSTORMS CONTINUE TO INCREASE IN AREAL COVERAGE
AND INTENSITY OVER PARTS OF WEST CENTRAL AND NORTHWEST TX THIS
AFTERNOON...IN VICINITY OF SURFACE OUTFLOW BOUNDARY. DESPITE
MARGINAL DEEP LAYER AND LOW LEVEL VERTICAL SHEAR
PROFILES...SUFFICIENT INSTABILITY AND FORCING ALONG BOUNDARY ARE
AIDING IN DEVELOPMENT OF A FEW SEVERE STORMS CAPABLE OF LARGE HAIL
AND DAMAGING WINDS.
AVIATION...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 22025.
..HART
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