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MESOSCALE DISCUSSION 0354
NWS STORM PREDICTION CENTER NORMAN OK
0659 PM CDT TUE MAR 31 2009
AREAS AFFECTED...NRN FL AND SCNTRL/SERN GA
CONCERNING...SEVERE THUNDERSTORM WATCH 98...99...
VALID 312359Z - 010130Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
98...99...CONTINUES.
MCV CONTINUES TO TRANSLATE THROUGH SCNTRL GA JUST SW OF DOUGLAS AT
2345Z. TLH 0.5 BASE VELOCITY DATA SHOWS A SIGNIFICANT COLD POOL
SWINGING SEWD INTO VALDOSTA AND TALLAHASSEE AREAS WITH RAPID UPSCALE
GROWTH OF BOW ECHOES /260@40KTS/ ALONG ITS LEADING EDGE.
UPR 60S SFC DEW POINTS/GULF BOUNDARY LAYER HAS MOVED INLAND AHEAD OF
THE ACTIVITY GENERALLY TO THE WEST OF I-75 AND SOUTH OF THE GA
BORDER. BUT...SOME RECOVERY IS POSSIBLE INTO AREAS FROM GAINESVILLE
TO JACKSONVILLE AHEAD OF THE MCS. THUS...STORMS MAY BEGIN TO
DEVELOP/PROPAGATE ESE ALONG/N OF I-10 WITH DMGG WINDS
LIKELY...INCLUDING LAKE CITY FL AND THE OKEFENOKEE SWAMP REGION. IF
THE STORMS CAN MANAGE TO MAINTAIN CHARACTER...JACKSONVILLE METRO MAY
EXPERIENCE DMGG WINDS BY 02Z.
TSTMS HAVE ALSO BEEN DEVELOPING ALONG THE RETURNING GULF AIR MASS IN
NRN FL/SRN GA FROM GAINESVILLE NWD INTO SCNTRL GA. HERE...LLVL
SHEAR IS SOMEWHAT SUPPORTIVE OF A BRIEF TORNADO BEFORE THE COLD POOL
SWEEPS THROUGH THE REGION.
SMALL PART OF SEVERE THUNDERSTORM WATCH 98 WAS LOCALLY EXTENDED BY
WFO TLH THROUGH 02Z IN THE ERN FL PNHDL TO ACCOUNT FOR THE BOWS
MOVING ACROSS THE REGION.
..RACY.. 03/31/2009
ATTN...WFO...JAX...TAE...
LAT...LON 31708299 31678218 31138124 30378124 30368208 29968295
29698378 30138463 31708299
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