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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 198

NWS STORM PREDICTION CENTER NORMAN OK

1145 PM CDT SUN APR 24 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       LARGE PART OF NORTHERN TEXAS



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 1145 PM UNTIL

500 AM CDT.



HAIL TO 2.5 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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES NORTH

NORTHWEST OF SAN ANGELO TEXAS TO 50 MILES NORTH OF LONGVIEW

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

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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...THIS SEVERE THUNDERSTORM WATCH REPLACES

TORNADO WATCH NUMBER 196. WATCH NUMBER 196 WILL NOT BE IN EFFECT

AFTER 1145 PM CDT. CONTINUE...WW 197...



DISCUSSION...SEVERE THUNDERSTORMS INCLUDING SUPERCELLS WILL CONTINUE

TO BE A THREAT THRU MUCH OF THE NIGHT WITH THE APPROACHING UPPER

TROUGH AND WIND MAX PROVIDING LARGE SCALE ASCENT.  WITH THE AIR MASS

REMAINING MDTLY UNSTABLE AND THE AVAILABLE SHEAR ADDITIONAL

THUNDERSTORMS WILL CONTINUE TO REDEVELOP FROM THE DRY LINE WRN

PORTION OF THE WATCH EWD.  PRIMARY THREAT WILL BE LARGE HAIL AND

LOCAL DAMAGING DOWNBURST WINDS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 24030.





...HALES

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