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 549 
 WTNT43 KNHC 130259
 TCDAT3
 TROPICAL DEPRESSION EIGHT DISCUSSION NUMBER   3
 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL   AL082007
 1100 PM EDT WED SEP 12 2007
  
 THE DEPRESSION HAS NOT APPRECIABLY CHANGED IN ITS CONVECTIVE
 ORGANIZATION OR ESTIMATED INTENSITY SINCE THIS AFTERNOON.  WHILE
 DVORAK...ADT...AND AMSU ESTIMATES ARE AT MINIMAL TROPICAL STORM
 INTENSITY...SSMI AND SSMIS MICROWAVE IMAGERY SUGGESTS INSTEAD THAT
 THE CENTER OF THE SYSTEM IS OFFSET ON THE NORTHEAST SIDE OF THE
 CONVECTION.  UPPER TROPOSPHERIC MOTION VECTORS SHOW THAT THERE
 REMAINS SOME MODERATE NORTHEASTERLY SHEAR THAT CONTINUES TO IMPACT
 THE SYSTEM.  SINCE THE ESTIMATED CENTER IS NOT WELL EMBEDDED WITHIN
 THE CONVECTION...THIS INDICATES THAT THE SYSTEM REMAINS A TROPICAL
 DEPRESSION AT THIS TIME.
 
 TD EIGHT IS SOUTH OF A WEAK DEEP LAYERED RIDGE WHICH IS CURRENTLY
 PROVIDING A STEERING OF ABOUT 280/10...SLIGHTLY MORE WESTWARD THAN
 INDICATED IN THE PREVIOUS ADVISORY.  ALL OF THE GLOBAL AND REGIONAL
 MODELS SHOW THE CYCLONE SLOWING BETWEEN 24 AND 48 HOURS IN RESPONSE
 TO THE INFLUENCE OF AN MID- TO UPPER-LEVEL TROUGH THAT IS CURRENTLY
 NORTH OF 25N AT THE SAME LONGITUDE OF THE DEPRESSION.  THE TROUGH
 SHOULD CUTOFF AND RETROGRADE WEST-SOUTHWESTWARD.  THIS HAS THE
 COMBINED EFFECT OF WEAKENING THE WEST-NORTHWESTWARD STEERING AS
 WELL AS INDUCING RATHER STRONG SOUTHWESTERLY SHEAR AT THE LONGER
 TIME PERIODS.  THE FORECAST TRACK IS THE CONSENSUS OF THE
 GFS...UKMET...GFDL...AND HWRF MODELS AND IS SLIGHTLY SOUTH OF THE
 PREVIOUS OFFICIAL FORECAST.  THE ECMWF AND NOGAPS MODELS ARE
 DISCOUNTED AS THEY UNREALISTICALLY TAKE THE DEPRESSION NORTHWARD
 ALMOST IMMEDIATELY.  
 
 THOUGH THE DEPRESSION IS OVER WARM 28C WATERS...NONE OF THE
 INTENSITY GUIDANCE TAKES TD EIGHT TO A HURRICANE IN THE NEXT FIVE
 DAYS.  THIS MAY BE DUE TO THE CLOSE PROXIMITY TO RATHER DRY AIR
 JUST TO THE NORTH AND WEST OF THE SYSTEM IN THE EARLY TIME PERIODS
 AND THE RATHER SHARP INCREASE IN SHEAR AT THE LATER TIME PERIODS. 
 THE INTENSITY FORECAST IS CLOSE TO THE SHIPS AND LGE MODELS THROUGH
 THREE DAYS AND A BLEND OF THESE TWO WITH THE GFDL AND HWRF MODELS
 AT DAYS FOUR AND FIVE.  
  
 FORECAST POSITIONS AND MAX WINDS
  
 INITIAL      13/0300Z 13.4N  46.4W    30 KT
  12HR VT     13/1200Z 13.9N  47.6W    35 KT
  24HR VT     14/0000Z 14.3N  48.6W    40 KT
  36HR VT     14/1200Z 14.6N  49.5W    45 KT
  48HR VT     15/0000Z 15.0N  50.6W    50 KT
  72HR VT     16/0000Z 16.0N  53.5W    55 KT
  96HR VT     17/0000Z 17.0N  56.5W    50 KT
 120HR VT     18/0000Z 18.0N  59.0W    45 KT
  
 $$
 FORECASTER LANDSEA/PASCH
  
 
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