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000 

WWUS20 KWNS 071835

SEL3

SPC WW 071835

OKZ000-TXZ000-080100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 273

NWS STORM PREDICTION CENTER NORMAN OK

135 PM CDT WED MAY 7 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTH CENTRAL OKLAHOMA

       NORTH CENTRAL TEXAS



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 135 PM UNTIL

800 PM CDT.



TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 55 MILES NORTH NORTHWEST OF

MINERAL WELLS TEXAS TO 45 MILES EAST SOUTHEAST OF DURANT

OKLAHOMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



DISCUSSION...SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP ALONG

NORTHERN EDGE OF SURGING SURFACE DRYLINE OVER NORTH CENTRAL TX...AND

IN REGION STRONG DEEP LAYER FORCING OVER SOUTHERN OK.  STORMS ARE

LIKELY TO BECOME SUPERCELLULAR WITH A RISK OF LARGE HAIL AND

DAMAGING WINDS.  LOW LEVEL VERTICAL SHEAR WILL ALSO BE SUFFICIENT

FOR A RISK OF TORNADOES LATER THIS AFTERNOON AS STORMS MOVE EASTWARD

INTO DEEPER LOW LEVEL MOISTURE.



AVIATION...TORNADOES AND 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

450. MEAN STORM MOTION VECTOR 25035.





...HART

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