WATCHES: Severe Thunderstorm Watch Number 290

WWUS20 KWNS 122242
SEL0
SPC WW 122242
TXZ000-130400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 290
NWS STORM PREDICTION CENTER NORMAN OK
540 PM CDT TUE MAY 12 2009

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

THE SOUTHEAST TEXAS PANHANDLE INTO WEST CENTRAL TEXAS

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 540 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 45
STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH
NORTHWEST OF CHILDRESS TEXAS TO 40 MILES SOUTHWEST OF SAN ANGELO
TEXAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

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 289...

DISCUSSION...HIGH-BASED CONVECTION IN THE DEEPLY MIXED ENVIRONMENT
ALONG AND W OF THE DRYLINE MAY SPREAD E FAR ENOUGH TO REACH SOMEWHAT
RICHER MOISTURE AND STRONGER INSTABILITY NEAR THE CAPROCK THIS
EVENING. VERY STEEP MID LEVEL LAPSE RATES AND MODEST DEEP LAYER
VERTICAL SHEAR IN ADVANCE OF A WEAK MID LEVEL WAVE EJECTING NEWD
FROM SE NM COULD SUPPORT A FEW SUPERCELLS WITH LARGE HAIL/DAMAGING
WINDS...AND CONVECTION MAY EVOLVE INTO ONE OR TWO SMALL CLUSTERS
EARLY TONIGHT. THE EWD EXTENT OF THE SEVERE THREAT WILL BE LIMITED
BY STRONG CONVECTIVE INHIBITION AFTER SUNSET.

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 27020.

...THOMPSON

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