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WWUS20 KWNS 251854

SEL5

SPC WW 251854

KSZ000-OKZ000-TXZ000-260100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 685

NWS STORM PREDICTION CENTER NORMAN OK

155 PM CDT SAT SEP 25 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTH CENTRAL KANSAS

       NORTHWEST OKLAHOMA

       NORTHERN TEXAS PANHANDLE



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 155 PM UNTIL

800 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 50

STATUTE MILES EITHER SIDE OF A LINE FROM 40 MILES WEST NORTHWEST

OF BORGER TEXAS TO 10 MILES SOUTH SOUTHEAST OF EMPORIA KANSAS.

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...SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP SOON

ALONG SURFACE COLD FRONT AND PRE-FRONTAL WIND SHIFT FROM CENTRAL KS

INTO THE TX PANHANDLE.  THESE STORMS WILL TRACK SLOWLY SOUTHWARD AND

ACROSS A NARROW BUT STRONG INSTABILITY CORRIDOR.  STEEP MID LEVEL

LAPSE RATES...FAVORABLE DEEP LAYER SHEAR...AND AMPLE MOISTURE WILL

HELP TO SUPPORT A FEW SEVERE STORMS CAPABLE OF LARGE HAIL AND

DAMAGING WINDS.



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 36020.





...HART

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