MESOSCALE DISCUSSION 0177
   NWS STORM PREDICTION CENTER NORMAN OK
   0327 PM CST SAT FEB 28 2009
   
   AREAS AFFECTED...SRN GA AND ADJACENT PORTIONS OF AL...NRN FL
   
   CONCERNING...TORNADO WATCH 42...
   
   VALID 282127Z - 282300Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 42 CONTINUES.
   
   SIZABLE BOUNDARY LAYER TEMPERATURE/DEW POINT SPREADS...ASSOCIATED
   WITH SUBSTANTIAL SURFACE HEATING AND LINGERING MODEST MOISTURE...
   APPEAR TO HAVE CONTRIBUTED TO CONVECTIVE OUTFLOWS FROM VIGOROUS
   STORM CELLS BECOMING MORE PROMINENT DURING THE PAST HOUR OR SO. 
   AND...THE RISK FOR DAMAGING WINDS NOW MAY BE THE PRIMARY SEVERE
   THREAT WITH THE CONVECTIVE LINE ALONG A PRE-FRONTAL CONFLUENCE ZONE
   ...WHICH SHOULD CONTINUE TO GRADUALLY ADVANCE ACROSS THE REMAINDER
   OF SOUTHERN GEORGIA...NEAR/NORTH OF THE FLORIDA BORDER INTO COASTAL
   AREAS...BETWEEN NOW AND 23-00Z.  THE STRONGER WEST SOUTHWESTERLY 850
   MB JET CORE ALREADY APPEARS TO BE LIFTING WITH FRONTAL WAVE INTO THE
   LEE OF THE APPALACHIANS.  BUT...30-40 KT SPEEDS ALONG THE TRAILING
   JET AXIS WILL MAINTAIN AT LEAST MODERATELY FAST STORM MOTIONS...WITH
   POTENTIAL FOR PEAK CONVECTIVE GUSTS APPROACHING OR BRIEFLY EXCEEDING
   50 KTS.
   
   ..KERR.. 02/28/2009
   
   
   ATTN...WFO...CHS...JAX...TAE...
   
   LAT...LON   31208369 31538269 31718197 31928124 30868131 30518192
               30388336 30378459 30678562 31208369