

000 

WWUS20 KWNS 292250

SEL0

SPC WW 292250

OKZ000-TXZ000-300600-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 90

NWS STORM PREDICTION CENTER NORMAN OK

545 PM CDT THU MAR 29 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN AND EASTERN OKLAHOMA

       CENTRAL AND NORTHERN TEXAS



EFFECTIVE THIS THURSDAY AFTERNOON AND FRIDAY MORNING FROM 545 PM

UNTIL 100 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 55 STATUTE

MILES EAST AND WEST OF A LINE FROM 35 MILES WEST NORTHWEST OF

GROVE OKLAHOMA TO 40 MILES SOUTHWEST OF WACO TEXAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU0).



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...THIS TORNADO WATCH REPLACES SEVERE

THUNDERSTORM WATCH NUMBER 89. WATCH NUMBER 89 WILL NOT BE IN

EFFECT AFTER 545 PM CDT.



DISCUSSION...POTENTIAL FOR ISOLATED TORNADOES WILL EXIST THIS

EVENING WITHIN COMPLEX...LARGER SCALE MCS EXTENDING FROM NEAR TPL

NNE TO NEAR BVO.  50-60 DEEP SSWLY SHEAR ACROSS REGION...COUPLED

WITH NEARLY SATURATED LOW LEVEL ENVIRONMENT...SUGGESTS THAT SETUP

WILL REMAIN FAVORABLE FOR THE DEVELOPMENT OF LARGER /MCV-SCALE/

CIRCULATIONS OR WEAK LOW PRESSURE AREAS THAT COULD CONTINUE TO

LOCALLY ENHANCE LOW-LEVEL CONVERGENCE/UPLIFT IN WEAKLY UNSTABLE

ENVIRONMENT.  RESULTING SEMI-DISCRETE STORMS COULD THEREFORE

MAINTAIN POTENTIAL FOR LOW- LEVEL ROTATION/ISOLATED TORNADOES

THROUGH LATE EVENING.



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 450.

MEAN STORM MOTION VECTOR 22035.





...CORFIDI

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