

602 

WWUS20 KWNS 021949

SEL0

SPC WW 021949

ARZ000-LAZ000-MSZ000-TXZ000-030300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 60

NWS STORM PREDICTION CENTER NORMAN OK

150 PM CST FRI MAR 2 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST ARKANSAS

       WESTERN AND CENTRAL LOUISIANA

       WESTERN MISSISSIPPI

       EASTERN TEXAS



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 150 PM UNTIL 900

PM 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 75

STATUTE MILES EAST AND WEST OF A LINE FROM 85 MILES NORTHEAST OF

MONROE LOUISIANA TO 50 MILES SOUTHWEST OF FORT POLK 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 56...WW 57...WW 58...WW

59...



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

INTENSITY THIS AFTERNOON ALONG COLD FRONT PROGRESSING EWD/SEWD

ACROSS THE REGION.  PRE-FRONTAL AIR MASS HAS WARMED INTO THE

80S...AND WHEN COUPLED WITH DEWPOINTS IN THE 60S...IS RESULTING IN

MLCAPE VALUES OF 1000-1500 J/KG.  GIVEN THE PRESENCE OF 50-60 KT

DEEP-LAYER SHEAR OBSERVED ACROSS FRONTAL ZONE...THE SETUP WILL

SUPPORT SUPERCELLS AND BOWING STRUCTURES.  WHILE A TORNADO IS

POSSIBLE...THE VEERED NATURE OF THE LOW-LEVEL WIND FIELD IS

RESULTING IN ONLY MODEST LOW-LEVEL SHEAR 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 25035.





...MEAD

