SEL1
SPC WW 171838
TXZ000-180100-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 151
NWS STORM PREDICTION CENTER NORMAN OK
140 PM CDT TUE APR 17 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
WESTERN NORTH TEXAS
EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 140 PM UNTIL
800 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 80
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 115 MILES WEST
NORTHWEST OF ABILENE TEXAS TO 15 MILES EAST NORTHEAST OF
STEPHENVILLE TEXAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE
THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).
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...SCATTERED THUNDERSTORMS ARE INCREASING OVER WEST TX IN
REGION OF STRONG DAYTIME HEATING AND STEEP LOW LEVEL LAPSE RATES.
CLEARING SKIES ARE EXPECTED TO DEVELOP EASTWARD ACROSS WATCH AREA
THIS AFTERNOON...WITH STORMS ALSO SPREADING ACROSS REGION. LARGE
HAIL IS LIKELY DUE TO COLD MID LEVEL TEMPERATURES. POTENTIAL ALSO
EXISTS FOR ISOLATED LANDSPOUTS GIVEN FAVORABLE THERMODYNAMIC AND
AMBIENT VORTICITY PATTERN.
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 27030.
..HART
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