

315 

WWUS20 KWNS 101020

SEL0

SPC WW 101020

ARZ000-LAZ000-OKZ000-TXZ000-101800-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 30

NWS STORM PREDICTION CENTER NORMAN OK

420 AM CST SUN FEB 10 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHWEST ARKANSAS

       NORTHWEST LOUISIANA

       FAR SOUTHEAST OKLAHOMA

       NORTHEAST TEXAS



EFFECTIVE THIS SUNDAY MORNING FROM 420 AM UNTIL NOON CST.



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 80

STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH

NORTHEAST OF TEXARKANA ARKANSAS TO 75 MILES WEST SOUTHWEST OF

NATCHITOCHES LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH

SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 28...WW 29...



DISCUSSION...A SQUALL LINE WILL CONTINUE TO MAKE A STEADY EASTWARD

PROGRESSION ACROSS THE ARKLATEX THROUGH THE MORNING...WHILE MOIST

ADVECTION CONTINUES TO OCCUR NEAR/JUST ABOVE THE SURFACE VIA A

STRONG LOW LEVEL JET. A HIGHLY SHEARED ENVIRONMENT WILL CONTINUE TO

YIELD AN ORGANIZED STORM MODE...WITH DAMAGING WINDS/SOME HAIL AS THE

PRIMARY HAZARDS. IT IS POSSIBLE THAT A TORNADO THREAT COULD INCREASE

BY LATE MORNING AS MORE CONSEQUENTIAL MOISTURE BECOMES ESTABLISHED

ACROSS THE REGION AND DESTABILIZATION OCCURS AHEAD OF THE SQUALL

LINE. ACCORDINGLY...PORTIONS OF THE SEVERE TSTM WATCH COULD

EVENTUALLY NECESSITATE A TORNADO WATCH UPGRADE...MAINLY ACROSS LA.



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 450. MEAN STORM

MOTION VECTOR 26040.





...GUYER

