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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 123

NWS STORM PREDICTION CENTER NORMAN OK

700 PM CDT SUN APR 10 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTH CENTRAL THROUGH SOUTH CENTRAL TEXAS



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 700 PM UNTIL

200 AM 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 65

STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES EAST

NORTHEAST OF SHERMAN TEXAS TO 115 MILES SOUTHWEST OF BROWNWOOD

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

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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.



OTHER WATCH INFORMATION...CONTINUE...WW 120...WW 121...WW 122...



DISCUSSION...TSTMS EXPECTED TO FORM IN THE NEXT HOUR OR SO ON AXIS

OF MERGING DRY LINE AND LEAD COLD FRONT ALONG WRN BORDER OF WW.

DEVELOPMENT MAY BE ENCOURAGED BY APPROACH OF UPR IMPULSE NOW OVER

FAR W TX.  INCREASING UVV...STRENGTHENING MID/UPR LVL WIND FIELD

WITH UPR IMPULSE...AND STEEP LOW TO MID-LVL LAPSE RATES TOGETHER

SUGGEST POTENTIAL FOR SUSTAINED STORMS/SUPERCELLS.  THESE LIKELY

WILL EVOLVE INTO ONE OR MORE CLUSTERS THAT SHOULD MOVE MAINLY E TO

ENE THROUGH LATE EVE/EARLY MON.  ASSOCIATED STORMS/BOWING SEGMENTS

COULD YIELD DMGG WIND...LARGE HAIL...AND PERHAPS A TORNADO OR TWO

GIVEN PREVAILING THERMODYNAMIC ENVIRONMENT.



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 550. MEAN STORM

MOTION VECTOR 25035.





...CORFIDI

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