

199 

WWUS20 KWNS 032045

SEL6

SPC WW 032045

ARZ000-OKZ000-040400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 136

NWS STORM PREDICTION CENTER NORMAN OK

345 PM CDT TUE APR 3 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WEST-CENTRAL ARKANSAS

       SOUTHEAST OKLAHOMA



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 345 PM UNTIL

1100 PM 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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES SOUTH

SOUTHWEST OF MCALESTER OKLAHOMA TO 10 MILES SOUTH OF HOT SPRINGS

ARKANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 132...WW 133...WW

134...WW 135...



DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND

INTENSITY ACROSS THE WATCH AREA LATE THIS AFTERNOON AND EVENING AS

DEEP-LAYER ASCENT IS ENHANCED BY VORTICITY MAXIMUM LIFTING NEWD

THROUGH THE RED RIVER VALLEY.  WHILE THE STRONGEST SURFACE-BASED

INSTABILITY IS FORECAST TO REMAIN S OF THE RED RIVER...LOCALLY

STRONGER DAYTIME HEATING HAS BOOSTED MLCAPE TO 1000-1500 J/KG OVER

SERN AND E-CNTRL OK.  WHEN COUPLED WITH STEADILY STRENGTHENING MID

AND HIGH-LEVEL FLOW...ENVIRONMENT WILL SUPPORT ORGANIZED STORM MODES

INCLUDING SUPERCELLS.  WHILE A TORNADO IS POSSIBLE...IT APPEARS THAT

THE MAJORITY OF STORMS MAY REMAIN SLIGHTLY ELEVATED WITH LARGE HAIL

AND DAMAGING WINDS BEING THE PRIMARY HAZARDS.



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 22030.





...MEAD

