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 167 
 WTNT41 KNHC 042056
 TCDAT1
 TROPICAL STORM TOMAS DISCUSSION NUMBER  27
 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL   AL212010
 500 PM EDT THU NOV 04 2010
  
 THIS AFTERNOON...TOMAS CONTINUES AS A SHEARED TROPICAL STORM WITH
 MOST OF THE DEEP CONVECTION LOCATED EAST OF A LOW-LEVEL SWIRL.
 DESPITE APPEARANCES THAT THE SWIRL IS THE CIRCULATION CENTER...THE
 AIR FORCE C-130 OBSERVATIONS INDICATE THAT THIS FEATURE HAS BEEN
 ROTATING AROUND A BROADER MEAN CENTER.  THE RECONNAISSANCE ALSO
 OBSERVED A CENTRAL PRESSURE OF 995 MB AND EQUIVALENT WINDS AT THE
 SURFACE OF ABOUT 45 KT...THOUGH THIS WIND VALUE COULD BE SLIGHTLY
 GENEROUS.
  
 THE MOTION OF THE CYCLONE IS 350 DEGREES AT 4 KT AS IT IS PRIMARILY
 BEING STEERED TO THE NORTH AROUND THE WESTERN PERIPHERY OF THE
 SUBTROPICAL RIDGE.  A VIGOROUS SHORT-WAVE TROUGH CURRENTLY OVER THE
 GULF OF MEXICO SHOULD INDUCE RECURVATURE OF TOMAS TOWARD THE
 NORTH-NORTHEAST AND ACCELERATION OF ITS FORWARD SPEED DURING THE 36
 HR OR SO.  THE TRACK MODELS ARE IN EXCELLENT AGREEMENT ON THIS
 POINT AND THE OFFICIAL FORECAST THROUGH 36 HR IS CLOSE TO THE MODEL
 CONSENSUS AND THE PREVIOUS ADVISORY.  AT 48 HR AND
 BEYOND...HOWEVER...THE EVENTUAL TRACK OF TOMAS IS QUITE UNCERTAIN.
 ONE GROUP OF MODELS...INCLUDING THE GFS...GFS ENSEMBLE
 MEAN...NOGAPS...HWRF...AND GFDL...CONTINUE TO SPEED THE CYCLONE
 NORTH-NORTHEASTWARD AND HAVE IT BECOMING EXTRATROPICAL AS IT
 ENCOUNTERS A STRONG COLD FRONT.  ANOTHER SCENARIO...SHARED BY THE
 ECMWF AND UKMET MODELS...IS THAT THE CYCLONE WOULD BECOME SHEARED
 AND SHALLOW...NOT PICKED UP BY THE TROUGH AND FRONT...AND MEANDER
 EASTWARD FOR A COUPLE DAYS.  THE CONSENSUS TECHNIQUES...BY
 DESIGN...SPLIT THE DIFFERENCE...WHICH IS NOT VERY LIKELY TO BE
 CORRECT.  IN A SOMEWHAT UNCOMFORTABLE COMPROMISE...THIS TRACK
 FORECAST IS NEARLY IDENTICAL TO THE PREVIOUS ADVISORY BUT IS
 SOMEWHAT EQUATORWARD OF THE MODEL CONSENSUS.
  
 TOMAS HAS ABOUT A DAY OR TWO TO INTENSIFY UNDER THE INFLUENCE OF
 MODERATE SOUTHERLY VERTICAL SHEAR...A MOIST ENVIRONMENT...VERY WARM
 WATERS...AND A SOMEWHAT UNSTABLE ATMOSPHERE.  BEYOND TWO DAYS...THE
 CYCLONE SHOULD EXPERIENCE STRONG WESTERLY SHEAR AND INCREASINGLY
 COOLER WATERS.  THE INTENSITY PREDICTION IS QUITE CLOSE TO A
 CONSENSUS OF DECAY-SHIPS...LGEM...AND GFDL MODELS AND NEARLY THE
 SAME AS THE PREVIOUS ADVISORY.  IT SHOULD BE NOTED THAT IF THE
 TRACK DOES TAKE THE CYCLONE DIRECTLY OVER EITHER EASTERN CUBA OR
 HISPANIOLA FOR MORE THAN A FEW HOURS...THE CYCLONE WOULD BE WEAKER
 THAN INDICATED HERE.
  
 REGARDLESS OF THE EXACT TRACK AND INTENSITY OF TOMAS...THE MOST
 SIGNIFICANT THREAT FROM THIS TROPICAL CYCLONE IS HEAVY RAINFALL...
 WHICH COULD PRODUCE FLASH FLOODING AND LIFE-THREATENING MUD SLIDES
 OVER HAITI AND THE DOMINICAN REPUBLIC DURING THE NEXT COUPLE OF
 DAYS.
  
 FORECAST POSITIONS AND MAX WINDS
  
 INITIAL      04/2100Z 16.6N  76.0W    45 KT
  12HR VT     05/0600Z 17.8N  75.6W    50 KT
  24HR VT     05/1800Z 20.1N  74.3W    60 KT
  36HR VT     06/0600Z 22.6N  72.5W    65 KT
  48HR VT     06/1800Z 24.8N  71.1W    55 KT
  72HR VT     07/1800Z 27.5N  69.0W    40 KT
  96HR VT     08/1800Z 28.5N  66.5W    30 KT
 120HR VT     09/1800Z 29.0N  64.5W    30 KT...POST-TROP/REMNT LOW
  
 $$
 FORECASTER LANDSEA/BEVEN
  
 
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