

000 

WWUS20 KWNS 102043

SEL6

SPC WW 102043

ARZ000-MSZ000-110300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 296

NWS STORM PREDICTION CENTER NORMAN OK

335 PM CDT SAT MAY 10 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN ARKANSAS

       NORTHWEST MISSISSIPPI



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 335 PM UNTIL

1000 PM CDT.



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



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

THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE

POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 65 MILES NORTH NORTHWEST OF

TEXARKANA ARKANSAS TO 35 MILES NORTH OF GREENWOOD MISSISSIPPI.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU6).



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.



OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 292. WATCH NUMBER 292 WILL NOT BE IN EFFECT AFTER

335 PM CDT. CONTINUE...WW 293...WW 294...WW 295...



DISCUSSION...POTENTIALLY VOLATILE SITUATION MAY BE UNFOLDING ACROSS

PORTIONS OF SOUTHWEST AND SOUTHERN AR...EWD TO NWRN/CNTRL MS THROUGH

THIS EVENING AS LARGE DEEP-LAYER CYCLONE CONTINUES TO INTENSIFY

ACROSS KS/MO AND ASCENT STRENGTHENS ACROSS VERY UNSTABLE AIR MASS.

WARM FRONT NOW BISECTING AR NW-SE HAS BEEN REINFORCED BY DAYLONG

STRONG TO SEVERE ELEVATED CONVECTION ACROSS THE OZARK PLATEAU. AS

STRONGER FORCING NOW EMERGES WITH THE ADVANCING UPPER

TROUGH...RESIDUAL WEAK INHIBITION SHOULD BE REMOVED AND ALLOW FOR

SURFACE-BASED STORM DEVELOPMENT. STORMS/SUPERCELLS DEVELOPING IN

UNPERTURBED AIR MASS ACROSS ERN/SERN OK WILL ENCOUNTER MOIST LOW

LEVEL ELY/SELY FLOW NEAR THE WARM FRONT/OUTFLOW BOUNDARY ACROSS AR

SHORTLY. LOW LEVEL SHEAR ALONG THIS BOUNDARY...AND ACROSS THE REST

OF THE WARM SECTOR...WILL SUPPORT LONG-LIVED UPDRAFT ROTATION. A

CORRIDOR OF GREATER POTENTIAL FOR STRONG TO INTENSE LOW LEVEL STORMS

ROTATION MAY EVOLVE THROUGH THE EVENING HOURS WITH THE THREAT OF ONE

OR TWO LONGER-LIVED STRONG TORNADOES WITHIN THE WATCH AREA.



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

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 26030.





...CARBIN

