

000 

WWUS20 KWNS 241449

SEL0

SPC WW 241449

ARZ000-LAZ000-OKZ000-TXZ000-242200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 30

NWS STORM PREDICTION CENTER NORMAN OK

845 AM CST SAT FEB 24 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       MUCH OF ARKANSAS

       MUCH OF NORTHERN LOUISIANA

       PARTS OF EASTERN OKLAHOMA

       NORTHEAST TEXAS



EFFECTIVE THIS SATURDAY MORNING AND AFTERNOON FROM 845 AM UNTIL

400 PM CST.



...THIS IS A PARTICULARLY DANGEROUS SITUATION...



DESTRUCTIVE TORNADOES...LARGE HAIL TO 2.5 INCHES IN DIAMETER...

THUNDERSTORM WIND GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE

POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 105 STATUTE

MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH NORTHEAST OF

RUSSELLVILLE ARKANSAS TO 35 MILES SOUTH OF SHREVEPORT LOUISIANA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU0).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



DISCUSSION...VERY INTENSE TROUGH AND ASSOCIATED 120KT MID LEVEL JET

MAX ROTATING EWD ACROSS SRN PLAINS.  WITH IMPRESSIVE RETURN OF GULF

MOISTURE UNDERWAY ALONG WITH STEEP MID LEVEL LAPSE

RATES...CONDITIONS WILL RAPIDLY BECOME FAVORABLE FOR DEVELOPMENT OF

TORNADIC SUPERCELLS.  CURRENT INHIBITION WILL QUICKLY WEAKEN NEWD

ACROSS WATCH AREA WITH MID LEVEL COOLING AND STRONG UPWARD MOTION.

TORNADO POTENTIAL EXPECTED TO INCREASE THRU THE AFTERNOON ACROSS THE

WATCH.  GIVEN THE VERY STRONG SHEAR PROFILES AND

THERMODYNAMICS...DEVELOPMENT OF STRONG TORNADOES ARE POSSIBLE BY

AFTERNOON.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 24050.





...HALES

