

710 

WWUS20 KWNS 290705

SEL9

SPC WW 290705

OKZ000-TXZ000-291400-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 779

NWS STORM PREDICTION CENTER NORMAN OK

200 AM CDT THU OCT 29 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHWESTERN OKLAHOMA

       NORTHWESTERN TEXAS



EFFECTIVE THIS THURSDAY MORNING FROM 200 AM UNTIL 900 AM CDT.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

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



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE

MILES EAST AND WEST OF A LINE FROM 25 MILES SOUTH SOUTHEAST OF

ABILENE TEXAS TO 40 MILES NORTH OF OKLAHOMA CITY OKLAHOMA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU9).



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.



OTHER WATCH INFORMATION...CONTINUE...WW 778...



DISCUSSION...A LINE OF STORMS FROM WEST CENTRAL OK SWWD INTO NWRN TX

WAS SLOWLY BECOMING BETTER ORGANIZED...AS STRONGER FORCING SPREADS

IN FROM THE SOUTHWEST. STRONGER CONVECTION CURRENTLY IS LOCATED

ALONG OR JUST BEHIND COLD FRONT. AS THE LINE MOVES SLOWLY EWD INTO A

MODERATELY UNSTABLE AIR MASS AND DEWPOINTS IN THE MID 60S...THE

POTENTIAL FOR SURFACE BASED STORMS WILL INCREASE. ALSO...GIVEN

EFFECTIVE SHEAR AT 60-70 KT AND 1 KM SRH IN THE 400-500 M2/S2

RANGE...ROTATING STORMS ARE LIKELY WITH EMBEDDED BOWS/WIND DAMAGE

AND POSSIBLY TORNADOES.



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

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.

MEAN STORM MOTION VECTOR 21040.





...IMY

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