SWOMCD
SPC MCD 181616
FLZ000-181715-
MESOSCALE DISCUSSION 2256
NWS STORM PREDICTION CENTER NORMAN OK
1016 AM CST FRI DEC 18 2009
AREAS AFFECTED...SOUTH FL
CONCERNING...TORNADO WATCH 804...
VALID 181616Z - 181715Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 804 CONTINUES.
LATEST RADAR AND SATELLITE IMAGERY SUGGEST THE BACK EDGE OF A WEAK
DISTURBANCE IS SHIFTING EAST ACROSS SOUTH FL. DATA ALSO STRONGLY
SUGGESTS AT LEAST TWO MCV-TYPE ROTATIONAL CLUSTERS ADVANCING
STEADILY TOWARD THE EAST COAST...SERVING AS THE EFFECTIVE BACK EDGE
OF THE SEVERE THREAT IN THE SHORT TERM. AHEAD OF THIS ORGANIZED
ACTIVITY...NUMEROUS SUPERCELLS...POTENTIALLY TORNADIC...CONTINUE
JUST OFF THE SE COAST WITH A FEW TRAILING SUPERCELLS INLAND OVER
DADE COUNTY. A BREAK IN DEEP CONVECTION SHOULD OCCUR IN THE WAKE OF
AFOREMENTIONED SEVERE THUNDERSTORMS BEFORE PRE-FRONTAL SEVERE
CONVECTION EVOLVES LATER THIS AFTERNOON.
..DARROW.. 12/18/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MFL...MLB...KEY...TBW...
LAT...LON 24408177 26738177 27627987 25317986 24408177
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