

627 

WWUS20 KWNS 112018

SEL9

SPC WW 112018

NMZ000-TXZ000-120400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 139

NWS STORM PREDICTION CENTER NORMAN OK

320 PM CDT SAT APR 11 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST NEW MEXICO

       SOUTHWEST INTO WEST CENTRAL TEXAS



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 320 PM UNTIL

1100 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 70

STATUTE MILES EAST AND WEST OF A LINE FROM 75 MILES NORTH

NORTHEAST OF HOBBS NEW MEXICO TO 20 MILES EAST OF DRYDEN 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...LARGE SCALE ASCENT WILL CONTINUE TO INCREASE STRONG TO

SEVERE THUNDERSTORM DEVELOPMENT ACROSS WW THIS EVENING AHEAD OF

UPPER LOW NOW MOVING INTO THE SRN ROCKIES.  MOISTENING SELY LOW

LEVEL FLOW SHOULD SUPPORT AXIS OF MODEST INSTABILITY...WITH

DESTABILIZATION SPREADING ENEWD WITH TIME.  SHEAR IS MORE THAN

ADEQUATE FOR SUPERCELLS...ALTHOUGH PRIMARY THREAT WILL BE LARGE

HAIL.  ISOLATED DAMAGING WINDS AND POSSIBLY A TORNADO MAY ACCOMPANY

SURFACE-BASED STORMS...ESPECIALLY IN SRN PORTIONS OF WW INTO THE

EARLY EVENING.



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.





...EVANS

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