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000 

WWUS20 KWNS 241651

SEL4

SPC WW 241651

TXZ000-250100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 174

NWS STORM PREDICTION CENTER NORMAN OK

1150 AM CDT TUE APR 24 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHERN AND CENTRAL TEXAS



EFFECTIVE THIS TUESDAY MORNING AND EVENING FROM 1150 AM UNTIL 800

PM CDT.



TORNADOES...HAIL TO 3.5 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 70 STATUTE

MILES EAST AND WEST OF A LINE FROM 40 MILES WEST NORTHWEST OF

SHERMAN TEXAS TO 40 MILES WEST SOUTHWEST OF JUNCTION TEXAS.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU4).



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 172...WW 173...



DISCUSSION...TSTMS EXPECTED TO INCREASE ALONG MERGING PACIFIC

FRONT/DRY LINE IN WRN PART OF WW...WHERE DEEP SHEAR WILL INCREASE

WITH CONTINUED ENE MOTION OF FAR W TX UPR DISTURBANCE.  BANDS OF

SEMI-DISCRETE...FAST- MOVING SUPERCELLS WILL POSE A SERIOUS THREAT

FOR VERY LARGE HAIL...HIGH WIND AND A FEW TORNADOES AS HEATING AND

RICH MOISTURE INFLOW CONTINUE ACROSS AREA.



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

SURFACE AND ALOFT TO 3.5 INCHES. EXTREME TURBULENCE AND SURFACE

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

550. MEAN STORM MOTION VECTOR 23040.





...CORFIDI

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