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000 

WWUS20 KWNS 132307

SEL4

SPC WW 132307

TXZ000-140400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 314

NWS STORM PREDICTION CENTER NORMAN OK

605 PM CDT TUE MAY 13 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTH CENTRAL TEXAS



EFFECTIVE THIS TUESDAY EVENING FROM 605 PM UNTIL 1100 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 65

STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES EAST

NORTHEAST OF JUNCTION TEXAS TO 55 MILES SOUTH SOUTHEAST OF DEL

RIO TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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 311...WW 312...



DISCUSSION...SUBTLE SRN STREAM IMPULSE AND UPSLOPE FLOW APPEAR TO BE

ENHANCING THUNDERSTORMS INVOF THE BIG BEND REGION EARLY THIS

EVENING.  THIS ACTIVITY SHOULD SPREAD EWD ACROSS THE HILL COUNTRY

OVER THE NEXT SEVERAL HOURS.  VWP/S AND FORECAST SOUNDINGS INDICATE

DEEP LAYER SHEAR SUPPORTIVE OF SUPERCELLS...WITH STRAIGHT LINE

HODOGRAPHS FAVORING BOTH RIGHT AND LEFT MOVING SPLITS.  LARGE

HAIL...SOME OF WHICH COULD BE QUITE LARGE...AND ISOLATED DAMAGING

WINDS SHOULD BE PRIMARY SEVERE THREATS GIVEN RELATIVELY WEAK LOW

LEVEL SHEAR IN PLACE OVER S-CENTRAL TX.



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 500. MEAN STORM

MOTION VECTOR 25030.





...EVANS

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