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409 

WWUS20 KWNS 101408

SEL9

SPC WW 101408

TXZ000-102100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 19

NWS STORM PREDICTION CENTER NORMAN OK

810 AM CST WED MAR 10 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN AND CENTRAL TEXAS



EFFECTIVE THIS WEDNESDAY MORNING AND AFTERNOON FROM 810 AM UNTIL

300 PM CST.



HAIL TO 1 INCH 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 NORTH AND SOUTH OF A LINE FROM 15 MILES SOUTHWEST

OF STEPHENVILLE TEXAS TO 65 MILES NORTHEAST OF CORSICANA TEXAS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU9).



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...TSTMS HAVE FORMED IN THE PAST HOUR OVER NW TX...ALONG

LEADING EDGE OF STRONG FORCING FOR ASCENT ASSOCIATED WITH ERN NM UPR

VORT.  AS UPR VORT CONTINUES ENEWD...AND BOUNDARY LAYER WARMS AND

MOISTENS AHEAD OF IT...STORMS MAY BUILD SWD INTO CNTRL TX...AND

POSSIBLY NWD TO THE RED RVR.  POTENTIAL MAY DEVELOP FOR SVR SFC

WINDS AND HAIL AS 700 MB FLOW INCREASES TO AOA 50 KTS.



AVIATION...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 400. MEAN STORM MOTION

VECTOR 25050.





...CORFIDI

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