

921 

WWUS20 KWNS 241013

SEL2

SPC WW 241013

OKZ000-TXZ000-241700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 12

NWS STORM PREDICTION CENTER NORMAN OK

410 AM CST THU FEB 24 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN AND WESTERN OKLAHOMA

       WEST CENTRAL AND NORTHWEST TEXAS



EFFECTIVE THIS THURSDAY MORNING FROM 410 AM UNTIL 1100 AM CST.



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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES NORTH OF

BIG SPRING TEXAS TO 40 MILES SOUTH OF CHANDLER OKLAHOMA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU2).



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...TSTMS EXPECTED TO INCREASE OVER W CNTRL AND NW TX

THROUGH LATER THIS MORNING AS SMALL SCALE IMPULSE AHEAD OF LARGER

SCALE UPR TROUGH NOW OVER NM CONTINUES NE AND FURTHER INTERACTS WITH

WRN EDGE OF PW AXIS.  CLOUD-LAYER WIND PROFILES AND STEEP MID-LVL

LAPSE RATES SUGGEST A THREAT FOR SVR HAIL WITH LONGER-LIVED UPDRAFTS



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 24035.





...CORFIDI

