

688 

WWUS20 KWNS 031827

SEL4

SPC WW 031827

ALZ000-MSZ000-040200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 344

NWS STORM PREDICTION CENTER NORMAN OK

130 PM CDT SUN JUN 3 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN ALABAMA

       EXTREME NORTHEAST MISSISSIPPI



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 130 PM UNTIL 900

PM CDT.



HAIL TO 2 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 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES SOUTHWEST

OF MUSCLE SHOALS ALABAMA TO 20 MILES EAST OF ANNISTON ALABAMA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU4).



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.



DISCUSSION...SCATTERED STRONG TO SEVERE STORMS ARE EXPECTED TO

INCREASE IN BOTH COVERAGE AND INTENSITY ALONG A WEAK WARM FRONTAL

ZONE DRAPED OVER NRN MS/AL. LIFT ALONG/ACROSS THIS BOUNDARY IS AIDED

BY A 20-30KT WLY LOW LEVEL JET AND MODEST 30KT NWLY FLOW AT MID

LEVELS WILL CONTRIBUTE TO SUFFICIENT SHEAR TO MAINTAIN UPDRAFT

ORGANIZATION AND PERSISTENCE. AIRMASS ALONG AND SOUTH OF THE

BOUNDARY IS VERY UNSTABLE ACROSS MS BUT LESS SO TO THE NORTH OF THE

BOUNDARY...OVER NRN AL. HOWEVER...LATEST SATL IMAGERY INDICATES THAT

STRONG HEATING SHOULD CONTINUE ACROSS NRN AL IN ADVANCE OF THE

ONGOING CONVECTION AND ADDITIONAL CELLS MAY DEVELOP ALONG THE FRONT

AND MOVE INTO AL THROUGH THE AFTERNOON. SOMEWHAT DRIER BOUNDARY

LAYER IN THIS REGION MAY SUPPORT DOWNBURST WIND POTENTIAL. IN

ADDITION TO LOCALLY STRONG DOWNBURST WINDS...LARGE HAIL IS POSSIBLE

WITH ANY OF THE PERSISTENT ROTATING STORMS GIVEN MAGNITUDE OF

AVAILABLE INSTABILITY TO THIS DEVELOPING CONVECTION.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 29035.





...CARBIN

