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000 

WWUS20 KWNS 131755

SEL0

SPC WW 131755

TXZ000-140000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 60

NWS STORM PREDICTION CENTER NORMAN OK

1255 PM CDT TUE MAR 13 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND NORTHERN TEXAS



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 1255 PM UNTIL

700 PM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75

STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES SOUTH

SOUTHEAST OF HONDO TEXAS TO 5 MILES NORTH NORTHEAST OF SHERMAN

TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



DISCUSSION...SCATTERED THUNDERSTORMS ARE EXPECTED TO INTENSIFY

ACROSS CENTRAL AND NORTH TX THROUGH THE AFTERNOON...ALONG

INSTABILITY AXIS AND WHERE POCKETS OF SUNSHINE ARE AIDING THREAT.

LOW LEVEL SHEAR IS RATHER WEAK.  HOWEVER...SUFFICIENT DEEP LAYER

VERTICAL SHEAR AND MODERATE CAPE VALUES INDICATE A RISK OF HAIL AND

DAMAGING WINDS IN STRONGER STORMS.



AVIATION...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 450. MEAN STORM

MOTION VECTOR 22030.





...HART

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