SEL5
SPC WW 111512
TXZ000-112300-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 375
NWS STORM PREDICTION CENTER NORMAN OK
1010 AM CDT THU JUN 11 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHERN AND EASTERN TEXAS
EFFECTIVE THIS THURSDAY MORNING AND EVENING FROM 1010 AM UNTIL
600 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 90
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH
NORTHWEST OF FORT WORTH TEXAS TO 40 MILES SOUTHWEST OF LUFKIN
TEXAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).
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 374...
DISCUSSION...ELEVATED TSTMS ARE FORMING THIS MORNING OVER N TX
WITHIN ZONE OF ASCENT N OF REMNANT OUTFLOW BOUNDARY. INFLOW AIR
MASS IS QUITE MOIST AND UNSTABLE WITH MLCAPE APPROACHING 2000-3000
J/KG LATER TODAY. THIS INSTABILITY IN CONJUNCTION WITH MODEST
DEEP-LAYER SHEAR WILL BE SUPPORTIVE OF UPSCALE STORM GROWTH INTO A
SEWD-MOVING MCS CAPABLE OF DAMAGING WINDS AND HAIL.
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 30030.
...MEAD/THOMPSON
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