Tropical Depression ONE

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TROPICAL DEPRESSION ONE SPECIAL DISCUSSION NUMBER   1
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL   AL012010
600 PM EDT FRI JUN 25 2010
 
THE AIR FORCE RESERVE HURRICANE HUNTER AIRCRAFT INVESTIGATING THE
DISTURBANCE IN THE WESTERN CARIBBEAN SEA HAS FOUND A WELL-DEFINED
CIRCULATION CENTER WITH A MINIMUM CENTRAL PRESSURE OF AROUND 1004
MB.  BASED ON DATA FROM THE AIRCRAFT...ADVISORIES ARE BEING
INITIATED ON TROPICAL DEPRESSION ONE AT THIS TIME.  THE INITIAL
INTENSITY IS SET AT 30 KT BASED ON A BLEND OF WIND DATA FROM THE
AIRCRAFT AND SURROUNDING OBSERVATIONS.
 
THE DEPRESSION IS VERY CLOSE TO TROPICAL STORM STRENGTH...AND
CONDITIONS APPEAR FAVORABLE FOR SOME INTENSIFICATION BEFORE IT
REACHES THE YUCATAN PENINSULA IN A DAY OR SO.  AFTER WEAKENING OVER
LAND...THE CYCLONE COULD REGAIN SOME STRENGTH WHEN IT ENTERS THE
SOUTHERN GULF OF MEXICO.  THE OFFICIAL INTENSITY FORECAST IS CLOSE
TO THE DECAY SHIPS MODEL...WHICH INCLUDES THE EFFECTS OF
INTERACTION WITH THE YUCATAN PENINSULA.
 
THE INITIAL MOTION IS RATHER UNCERTAIN BUT THE BEST ESTIMATE IS
300/09.  A MID-LEVEL RIDGE IS FORECAST TO PERSIST OVER THE GULF OF
MEXICO FOR THE NEXT 48 TO 72 HOURS...THEREFORE A GENERAL
WEST-NORTHWESTWARD MOTION IS EXPECTED DURING THAT TIME...WHICH
SHOULD BRING THE CYCLONE ACROSS THE YUCATAN PENINSULA AND INTO THE
SOUTHERN GULF OF MEXICO.  AFTER 72 HOURS THE TRACK MODEL GUIDANCE
DIVERGES...WITH ONE GROUP...INCLUDING THE HWRF AND GFDL...TAKING
THE SYSTEM ON A MORE NORTHERLY OR NORTHEASTERLY TRACK.  A SECOND
GROUP OF GUIDANCE...INCLUDING THE GFS...ECMWF AND NOGAPS KEEPS THE
SYSTEM ON A MORE WESTERLY TRACK OVER THE SOUTHERN GULF OF MEXICO. 
THE OFFICIAL FORECAST IS A BLEND OF THESE TWO.
 
A TROPICAL STORM WARNING IS REQUIRED FOR THE EAST COAST OF THE
YUCATAN PENINSULA AT THIS TIME.  IF THE CYCLONE MOVES SOUTH OF THE
OFFICIAL FORECAST TRACK...A TROPICAL STORM WARNING FOR BELIZE MAY
BE REQUIRED LATER THIS EVENING. 
 
FORECAST POSITIONS AND MAX WINDS
 
INITIAL      25/2200Z 16.5N  83.5W    30 KT
 12HR VT     26/0600Z 17.4N  84.7W    35 KT
 24HR VT     26/1800Z 18.5N  86.5W    40 KT
 36HR VT     27/0600Z 19.5N  88.0W    45 KT...INLAND
 48HR VT     27/1800Z 21.0N  89.5W    25 KT...INLAND
 72HR VT     28/1800Z 23.0N  91.5W    30 KT
 96HR VT     29/1800Z 24.0N  92.5W    35 KT
120HR VT     30/1800Z 25.0N  93.5W    40 KT
 
$$
FORECASTER AVILA/BRENNAN
 
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