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175 

WWUS20 KWNS 280057

SEL3

SPC WW 280057

LAZ000-MSZ000-CWZ000-280700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 83

NWS STORM PREDICTION CENTER NORMAN OK

750 PM CDT FRI MAR 27 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHEAST LOUISIANA

       SOUTHERN MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 750 PM

UNTIL 200 AM CDT.



TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 95 STATUTE

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

MISSISSIPPI TO 35 MILES EAST SOUTHEAST OF INTRACOASTAL CITY

LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 78...WW 79...WW 80...WW

81...WW 82...



DISCUSSION...COMPLEX AND DANGEROUS SITUATION UNFOLDING ACROSS THE MS

DELTA REGION TONIGHT. TWO INTENSE CLUSTERS OF CONVECTION WITH

EMBEDDED SUPERCELLS ARE UNDERWAY ALONG RETURNING WARM

FRONT/OUTFLOW....ONE NOW NEAR ALLEN PARISH AND ANOTHER OVER AMITE

COUNTY MS. INCREASINGLY STRONG SLY LOW LEVEL FLOW IN ADVANCE OF

DEEPENING LARGE SCALE CYCLONE ACROSS THE ARKLATEX REGION WILL

CONTINUE TO AID WARM MOIST INFLOW INTO THIS CONVECTIVELY ACTIVE

REGION FOR SEVERAL MORE HOURS. EARLIER EVENING SOUNDINGS SUGGESTED

THAT LOW LEVEL FLOW WAS RELATIVELY LIMITED TO SUSTAIN MORE INTENSE

UPDRAFT ROTATION. HOWEVER...NOT ONLY IS THAT EXPECTED TO CHANGE

DRAMATICALLY OVER THE NEXT FEW HOURS BUT THE EARLIER SOUNDINGS

PROBABLY DID NOT ADEQUATELY SAMPLE THE LOW LEVEL SHEAR NEAR THE

FRONT AND WEAK SUB-SYNOPTIC LOWS COINCIDENT WITH THE MOST VIGOROUS

CONVECTION. THUS...STORMS WILL CONTINUE TO HAVE THE POTENTIAL TO

PRODUCE TORNADOES...ALONG WITH VERY LARGE HAIL. EVENTUALLY...EXPECT

ADVANCING COLD FRONT TO SUPPORT MORE SQUALL LINEAR DEVELOPMENT WITH

DAMAGING WINDS LIKELY LATER TONIGHT.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 24030.





...CARBIN

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