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WWUS20 KWNS 080142

SEL6

SPC WW 080142

TXZ000-080900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 256

NWS STORM PREDICTION CENTER NORMAN OK

840 PM CDT MON MAY 7 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN TEXAS



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 840 PM UNTIL

400 AM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 60

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 5 MILES NORTHWEST OF

CHILDRESS TEXAS TO 55 MILES EAST OF FORT STOCKTON 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.



OTHER WATCH INFORMATION...CONTINUE...WW 253...WW 254...WW 255...



DISCUSSION...SCTD SLIGHTLY ELEVATED TSTMS EXPECTED TO INCREASE IN

COVERAGE AND PROBABLY IN INTENSITY OVERNIGHT ON WRN EDGE OF

STRENGTHENING SSELY LLJ.  ACTIVITY ALSO MAY BE ENHANCED BY

DIFFLUENCE/ASCENT DOWNSTREAM FROM NRN MEXICAN UPPER TROUGH.  WARM

ADVECTION PATTERN DOES NOT APPEAR TO BE WELL-FOCUSED.  BUT

MOISTURE-RICH INFLOW AND MODERATELY STEEP MID LEVEL LAPSE RATES

SUGGEST POSSIBILITY FOR HAIL/LOCALLY DAMAGING WIND.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 50

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 22025.





...CORFIDI

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