

698 

WWUS20 KWNS 230238

SEL8

SPC WW 230238

TXZ000-230900-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 78

NWS STORM PREDICTION CENTER NORMAN OK

935 PM CDT THU APR 22 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHWEST AND WEST CENTRAL TEXAS



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 935 PM

UNTIL 400 AM 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 105 STATUTE

MILES EAST AND WEST OF A LINE FROM 35 MILES EAST NORTHEAST OF BIG

SPRING TEXAS TO 65 MILES EAST SOUTHEAST OF DRYDEN 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.



OTHER WATCH INFORMATION...CONTINUE...WW 76...WW 77...



DISCUSSION...TSTMS HAVE BEGUN TO FORM IN THE PAST HOUR ALONG MERGING

COLD FRONT/DRY LINE IN SW TX...W OF MAF.  AREA VWP AND SFC DATA

SUGGEST THAT RESULTING LOW-LVL CONVERGENCE WILL BE SUFFICIENT FOR

SUSTAINED STORMS/POSSIBLE SUPERCELLS GIVEN /1/ INCREASING MOISTURE

/PW APPROACHING INCH/ IN SSELY NEAR-SFC FLOW E OF FRONT/DRY

LINE.../2/ GLANCING INFLUENCE OF UPR DISTURBANCE MOVING NNE ACROSS

NM...AND /3/ PRESENCE OF STRONG WSWLY DEEP SHEAR.  LARGE HAIL...DMGG

WINDS...AND ISOLD TORNADOES MAY OCCUR AS THE STORMS ORGANIZE INTO

BROKEN BANDS



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

550. MEAN STORM MOTION VECTOR 25030.





...CORFIDI

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