Tornado Watch Up
Posted by JAC on 3/11/2010, 12:12 pm
STRONG LOW LEVEL WARM ADVECTION APPEARS TO BE THE PRIMARY INSTIGATOR
  IN ONGOING WIDESPREAD CONVECTION ACROSS THE NRN/CNTRL
  PENINSULA...WWD INTO THE NERN GULF OF MEXICO.  LATEST
  SATELLITE/RADAR IMAGERY DEPICT A VERY CLEAR BACK EDGE TO THIS
  ACTIVITY OVER THE NERN GOM WITH NE-SW ORIENTED BROKEN SQUALL LINE
  PROGRESSING ESEWD AT ROUGHLY 20-25KT.  THIS MOVEMENT WOULD SUGGEST
  SUBSIDENCE WILL NOT OVERSPREAD THE WRN PENINSULA NORTH OF TPA UNTIL
  AT LEAST 20Z.  PRIOR TO THIS...GRADUAL BOUNDARY LAYER WARMING WILL
  ENCOURAGE NEAR-SFC BASED UPDRAFTS SOUTH OF THE EXTENSIVE PRECIP
  SHIELD AND WITH STRONG SHEAR IN PLACE DEEP ROTATION IS LIKELY.
  GIVEN THAT ISOLATED SUPERCELLS HAVE ALREADY DEVELOPED...IT APPEARS
  THE THREAT FOR TORNADOES MAY GRADUALLY INCREASE THROUGH THE MID DAY
  INTO THE AFTERNOON HOURS.  WILL CONTINUE TO MONITOR FOR POSSIBLE
  TORNADO WATCH.






URGENT - IMMEDIATE BROADCAST REQUESTED
  TORNADO WATCH NUMBER 29
  NWS STORM PREDICTION CENTER NORMAN OK
  1100 AM EST THU MAR 11 2010
 
  THE NWS STORM PREDICTION CENTER HAS ISSUED A
  TORNADO WATCH FOR PORTIONS OF
 
         MUCH OF CENTRAL FLORIDA PENINSULA
         COASTAL WATERS
 
  EFFECTIVE THIS THURSDAY MORNING AND EVENING FROM 1100 AM UNTIL
  600 PM EST.
 
  TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
  TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
 
  THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE
  MILES NORTH AND SOUTH OF A LINE FROM 60 MILES WEST NORTHWEST OF
  SAINT PETERSBURG FLORIDA TO 30 MILES EAST NORTHEAST OF MELBOURNE
  FLORIDA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
  ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).


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South FL could be under-the-gun this afternoon - JAC, 3/11/2010, 7:44 am
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