

358 

WWUS20 KWNS 290627

SEL8

SPC WW 290627

OKZ000-TXZ000-291200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 778

NWS STORM PREDICTION CENTER NORMAN OK

120 AM CDT THU OCT 29 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN OKLAHOMA

       NORTH CENTRAL TEXAS



EFFECTIVE THIS THURSDAY MORNING FROM 120 AM UNTIL 700 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 EITHER SIDE OF A LINE FROM 25 MILES NORTH OF MCALESTER

OKLAHOMA TO 40 MILES WEST OF CORSICANA TEXAS.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU8).



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...STORMS HAVE BEEN SLOWLY STRENGTHENING THE PAST COUPLE

OF HOURS  ACROSS NRN TEXAS. WARM FRONT EXTENDED FROM NEAR FSI TO

GGG...AND DEWPOINTS NEAR 70 IN THE WARM SECTION APPEARED TO BE

AIDING IN THE DEVELOPMENT OF NEAR SURFACE BASED STORMS. THE

COMBINATION OF THIS MOIST ENVIRONMENT AND 1 KM SHEAR AT 40-50 KT

WILL BE FAVORABLE FOR ROTATING STORMS AND TORNADOES. AS THE WARM

FRONT CONTINUES TO RETREAT NWD THROUGH THE EARLY MORNING HOURS...THE

THREAT FOR TORNADOES WILL SPREAD INTO SRN OK.



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 20040.





...IMY

