SEL6
SPC WW 211847
TXZ000-220200-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 316
NWS STORM PREDICTION CENTER NORMAN OK
145 PM CDT SAT MAY 21 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
CENTRAL TEXAS
EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 145 PM UNTIL
900 PM CDT.
HAIL TO 2.5 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 60
STATUTE MILES EAST AND WEST OF A LINE FROM 80 MILES WEST
SOUTHWEST OF AUSTIN TEXAS TO 50 MILES EAST NORTHEAST OF
STEPHENVILLE TEXAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE
THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).
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...ISOLATED SEVERE TSTM DEVELOPMENT IS ANTICIPATED WITHIN
THE NEXT HOUR ALONG SLOW-MOVING DRYLINE. WARM SECTOR AIR MASS IS
HOT AND QUITE MOIST WITH MLCAPE VALUES OF 2500-3500+ J/KG. WHILE
LOW-LEVEL WIND FIELD IS NOT PARTICULARLY STRONG...THE PRESENCE OF
AROUND 40 KT WLY FLOW IN THE MIDLEVELS IS RESULTING IN SUFFICIENT
DEEP-LAYER SHEAR FOR SUPERCELLS. VERY LARGE HAIL WILL BE THE
PRIMARY HAZARD WITH ANY STORMS THAT DEVELOP.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM
MOTION VECTOR 27020.
...MEAD
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