

667 

WWUS20 KWNS 311439

SEL7

SPC WW 311439

LAZ000-MSZ000-CWZ000-312200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 97

NWS STORM PREDICTION CENTER NORMAN OK

935 AM CDT TUE MAR 31 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN AND SOUTHERN LOUISIANA

       CENTRAL AND SOUTHWEST MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 935 AM UNTIL

500 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 95

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH

NORTHEAST OF JACKSON MISSISSIPPI TO 15 MILES SOUTH OF

INTRACOASTAL CITY LOUISIANA.  FOR A COMPLETE DEPICTION OF THE

WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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...ONGOING LINE OF THUNDERSTORMS ACROSS NRN LA WILL LIKELY

EXPAND IN COVERAGE AND GRADUALLY INTENSIFY THROUGH THE DAY AS THE

WARM FRONT LIFTS SLOWLY NWD ACROSS LA/SRN MS.  THOUGH LOW-LEVEL

SHEAR WILL TEND TO WEAKEN WITH TIME...DEEP LAYER SHEAR AND MODERATE

INSTABILITY WILL REMAIN FAVORABLE FOR EMBEDDED BOW ECHOES AND

SUPERCELL STRUCTURES CAPABLE OF PRODUCING DAMAGING WINDS AND LARGE

HAIL THRONG THIS AFTERNOON.



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 27030.





...THOMPSON

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