SWOMCD
SPC MCD 231521
FLZ000-231715-
MESOSCALE DISCUSSION 1285
NWS STORM PREDICTION CENTER NORMAN OK
1021 AM CDT TUE JUN 23 2009
AREAS AFFECTED...WRN FLORIDA
CONCERNING...SEVERE THUNDERSTORM WATCH 495...
VALID 231521Z - 231715Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 495
CONTINUES.
SKIES ARE CLEARING RAPIDLY BEHIND THE MORNING CONVECTION...WITH A
DISTINCT OUTFLOW BOUNDARY ACROSS WRN FL. A VERY MOIST AND UNSTABLE
AIR MASS REMAINS ALONG AND W OF THIS OUTFLOW...AND EVEN THE OUTFLOW
ITSELF IS EXPECTED TO DESTABILIZE FURTHER. THE 12Z TBW SOUNDING
SHOWS OVER 4000 J/KG MLCAPE WHEN MODIFIED FOR CURRENT CONDITIONS.
GPS WATER VAPOR OBSERVATIONS CONTINUE TO SHOW PRECIPITABLE WATER
VALUES OVER 2.00 INCHES. IN ADDITION...WATER VAPOR IMAGERY SHOWS A
RELATIVE MOIST PLUME EXTENDING SEWD OUT OF SRN AL/GA INTO FL.
THUS...WITH CONTINUED DAYTIME HEATING...VIGOROUS UPDRAFTS ARE
EXPECTED TO FORM ALONG THE OUTFLOW BOUNDARY/SEA BREEZE...WITH STORMS
MOVING IN A SWD DIRECTION. WHILE DAMAGING WIND GUSTS WILL BE THE
PRIMARY THREAT...THERE IS SOME THREAT OF A BRIEF TORNADO ALONG THE
OUTFLOW BOUNDARY WHERE ENHANCED LOW LEVEL VORTICITY MAY EXIST.
..JEWELL.. 06/23/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MFL...MLB...TBW...JAX...
LAT...LON 29088279 28998217 28598164 27868150 26828138 25698084
25198117 25778175 26608235 27448277 27858293 28298284
28758273 29088279
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