

573 

WWUS20 KWNS 311954

SEL0

SPC WW 311954

LAZ000-MSZ000-CWZ000-010200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 330

NWS STORM PREDICTION CENTER NORMAN OK

255 PM CDT THU MAY 31 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST LOUISIANA

       SOUTHEAST AND EAST CENTRAL MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 255 PM UNTIL

900 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 55

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES SOUTHEAST OF

NEW ORLEANS LOUISIANA TO 35 MILES WEST NORTHWEST OF MERIDIAN

MISSISSIPPI.  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 327...WW 328...WW 329...



DISCUSSION...SEVERAL ORGANIZED BANDS OF STRONG/SEVERE STORMS ARE

PROGRESSING EWD ACROSS SOUTH CENTRAL MS AND SRN LA.  THESE STORMS

WILL MOVE INTO A MODERATELY UNSTABLE DOWNSTREAM ENVIRONMENT WITH

MLCAPE OF 1500-2000 J/KG.  DEEP LAYER SHEAR IN THE LOWEST 8 KM IS

SUFFICIENT TO MAINTAIN MULTICELL STRUCTURES WITH STRONGER CELLS

CAPABLE OF PRODUCING LOCALIZED DAMAGING WIND GUSTS AND OCCASIONAL

HAIL.



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 550. MEAN STORM

MOTION VECTOR 24020.





...WEISS

