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000 

WWUS20 KWNS 170442

SEL5

SPC WW 170442

TXZ000-171000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 705

NWS STORM PREDICTION CENTER NORMAN OK

1140 PM CDT TUE OCT 16 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       THE CENTRAL AND EASTERN TEXAS PANHANDLE



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 1140 PM

UNTIL 500 AM 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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES SOUTHEAST OF

AMARILLO TEXAS TO 55 MILES NORTH NORTHEAST OF BORGER 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.



DISCUSSION...SLIGHTLY ELEVATED THUNDERSTORMS WILL INCREASE IN

COVERAGE OVERNIGHT IN RESPONSE TO AN APPROACHING MID LEVEL TROUGH

FROM NM...AND INCREASING L0W-LEVEL MOISTURE ON A 40 KT LLJ.

RELATIVELY STEEP LAPSE RATES FROM 850-500 MB AND STRONG EFFECTIVE

BULK SHEAR SHOULD SUPPORT A FEW SUPERCELLS...WHICH WILL LOCALLY

ENHANCE THE LARGE HAIL THREAT.



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 24035.





...THOMPSON

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