

167 

WWUS20 KWNS 080456

SEL3

SPC WW 080456

NMZ000-TXZ000-081100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 863

NWS STORM PREDICTION CENTER NORMAN OK

1200 AM CDT SAT OCT 8 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EXTREME SOUTHEAST NEW MEXICO

       WEST CENTRAL TEXAS



EFFECTIVE THIS SATURDAY MORNING FROM MIDNIGHT UNTIL 600 AM CDT.



HAIL TO 1.5 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 45

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTHWEST OF

PLAINVIEW TEXAS TO 35 MILES SOUTHEAST OF WINK 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 861...WW 862...



DISCUSSION...AN EJECTING MIDLEVEL TROUGH AND SURFACE COLD FRONT WILL

SPREAD EWD INTO W TX OVERNIGHT...WITH THUNDERSTORM DEVELOPMENT

LIKELY ALONG THE COLD FRONT IN THE NEXT COUPLE OF HOURS.  MUCAPE AOA

1500 J/KG AND STRONG VERTICAL SHEAR WILL SUPPORT AN ORGANIZED LINE

OF THUNDERSTORMS WITH THE POTENTIAL FOR A FEW DAMAGING GUSTS AND

LARGE HAIL.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 24035.





...THOMPSON

