

641 

WWUS20 KWNS 250602

SEL0

SPC WW 250602

LAZ000-MSZ000-CWZ000-251400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 40

NWS STORM PREDICTION CENTER NORMAN OK

1205 AM CST MON FEB 25 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST LOUISIANA

       FAR SOUTHEAST MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS MONDAY MORNING FROM 1205 AM UNTIL 800 AM CST.



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 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES SOUTH

SOUTHWEST OF BATON ROUGE LOUISIANA TO 45 MILES EAST SOUTHEAST OF

GULFPORT 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 39...



DISCUSSION...ELEVATED TSTMS /INCLUDING SUPERCELLS/ ARE EXPECTED TO

PERSIST OVERNIGHT WITHIN A ZONE OF LOW-LEVEL WAA/ISENTROPIC ASCENT N

OF STATIONARY FRONT...WITH DEEP-LAYER ASCENT POSSIBLY AUGMENTED BY A

WEAK IMPULSE MOVING ALONG THE GULF COAST.  LOCAL ENVIRONMENT IS

CHARACTERIZED BY MUCAPE OF AROUND 1000 J/KG AND 50 KT OF EFFECTIVE

BULK SHEAR WHICH WILL CONTINUE TO PROMOTE ORGANIZED/ROTATING

UPDRAFTS WITH A RISK FOR LARGE HAIL AND DAMAGING WINDS.



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 400. MEAN STORM

MOTION VECTOR 25035.





...MEAD



732 

WWUS20 KWNS 250602

SEL0

SPC WW 250602

LAZ000-MSZ000-CWZ000-251400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 40

NWS STORM PREDICTION CENTER NORMAN OK

1205 AM CST MON FEB 25 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST LOUISIANA

       FAR SOUTHEAST MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS MONDAY MORNING FROM 1205 AM UNTIL 800 AM CST.



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 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES SOUTH

SOUTHWEST OF BATON ROUGE LOUISIANA TO 45 MILES EAST SOUTHEAST OF

GULFPORT 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 39...



DISCUSSION...ELEVATED TSTMS /INCLUDING SUPERCELLS/ ARE EXPECTED TO

PERSIST OVERNIGHT WITHIN A ZONE OF LOW-LEVEL WAA/ISENTROPIC ASCENT N

OF STATIONARY FRONT...WITH DEEP-LAYER ASCENT POSSIBLY AUGMENTED BY A

WEAK IMPULSE MOVING ALONG THE GULF COAST.  LOCAL ENVIRONMENT IS

CHARACTERIZED BY MUCAPE OF AROUND 1000 J/KG AND 50 KT OF EFFECTIVE

BULK SHEAR WHICH WILL CONTINUE TO PROMOTE ORGANIZED/ROTATING

UPDRAFTS WITH A RISK FOR LARGE HAIL AND DAMAGING WINDS.



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 400. MEAN STORM

MOTION VECTOR 25035.





...MEAD

