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000 

WWUS20 KWNS 131905

SEL1

SPC WW 131905

OKZ000-TXZ000-140200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 311

NWS STORM PREDICTION CENTER NORMAN OK

205 PM CDT TUE MAY 13 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       MUCH OF CENTRAL AND EASTERN OKLAHOMA

       A LARGE PART OF NORTHERN TEXAS



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 205 PM UNTIL

900 PM CDT.



TORNADOES...HAIL TO 3.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 85 STATUTE

MILES EAST AND WEST OF A LINE FROM 50 MILES WEST OF TEMPLE TEXAS

TO 30 MILES NORTH NORTHWEST OF MUSKOGEE OKLAHOMA.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU1).



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...VERY UNSTABLE AIR MASS WITH MLCAPES AOA 3000 J/KG AND

LITTLE REMAINING INHIBITION ARE IN PLACE AHEAD OF COLD FRONT ACROSS

NRN TX/SRN OK.  THUNDERSTORMS EXPECTED TO DEVELOP RAPIDLY DURING THE

AFTERNOON ALONG/AHEAD OF COLD FRONT AND THE DRY LINE EXTENDING SWD

IN NRN TX.  MDT/STG DEEP LAYER SHEAR WILL SUPPORT SUPERCELLS

INCLUDING THREAT OF VERY LARGE HAIL AND TORNADOES.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 3.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 24030.





...HALES

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