

606 

WWUS20 KWNS 290356

SEL7

SPC WW 290356

NMZ000-TXZ000-290900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 207

NWS STORM PREDICTION CENTER NORMAN OK

1100 PM CDT TUE APR 28 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST NEW MEXICO

       SOUTHWEST TEXAS



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 1100 PM

UNTIL 400 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 75

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES SOUTH OF

ROSWELL NEW MEXICO TO 55 MILES NORTH NORTHEAST OF MIDLAND TEXAS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU7).



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

SEVERE THUNDERSTORM WATCH NUMBER 205. WATCH NUMBER 205 WILL NOT

BE IN EFFECT AFTER 1100 PM CDT. CONTINUE...WW 206...



DISCUSSION...POTENTIAL FOR SUPERCELLS AND ADDITIONAL ELEVATED

STRONG/SEVERE THUNDERSTORM CLUSTERS WILL CONTINUE OVERNIGHT OVER THE

REGION AHEAD OF BROAD UPPER TROUGH.  AIRMASS REMAINS MODERATELY

UNSTABLE WITH 45-55 KT EFFECTIVE SHEAR.  ALTHOUGH AN ISOLATED

TORNADO COULD OCCUR WITH INITIAL STORMS LATE THIS EVENING...OVERALL

THREAT SHOULD EVOLVE TOWARDS LARGE HAIL AS STORMS BECOME MORE

ELEVATED WITH EWD EXTENT.



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 500. MEAN STORM

MOTION VECTOR 26020.





...EVANS

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