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000 

WWUS20 KWNS 122210

SEL1

SPC WW 122210

NMZ000-TXZ000-130500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 131

NWS STORM PREDICTION CENTER NORMAN OK

510 PM CDT THU APR 12 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SMALL PART OF EASTERN NEW MEXICO

       MUCH OF TEXAS PAN HANDLE



EFFECTIVE THIS THURSDAY AFTERNOON FROM 510 PM UNTIL MIDNIGHT 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 80

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTH

NORTHEAST OF DALHART TEXAS TO 50 MILES SOUTH SOUTHEAST OF LUBBOCK

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

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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...MOISTURE WILL CONTINUE TO INCREASE NWD ACROSS WATCH

AREA THRU THE EVENING ON STRONG SELY JET.  WITH VERY FAVORABLE DEEP

SHEAR AND STEEP LAPSE RATES IN PLACE...THUNDERSTORMS SHOULD DEVELOP

FROM W TO E ACROSS THE WATCH AREA.  PRIMARY THREAT WILL BE LARGE

HAIL...PARTICULARLY WITH ANY SUPERCELL THAT DEVELOPS. DAMAGING

DOWNBURSTS ALSO POSSIBLE GIVEN THE STEEP LAPSE RATES AND STRONG

SHEAR PROFILES.



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 450. MEAN STORM

MOTION VECTOR 24030.





...HALES

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