Severe threat shifting east - a bumpy day ahead
Posted by JAC on 12/18/2009, 11:39 am




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
 
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Very Unstable Air pushing up from the GOM, Tornado Watch for South FL - JAC, 12/18/2009, 7:43 am
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