

797 

WWUS20 KWNS 111512

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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