ZCZC MIATCDEP1 ALL TTAA00 KNHC DDHHMM TROPICAL STORM ALETTA DISCUSSION NUMBER 7 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL EP012006 200 PM PDT SUN MAY 28 2006 THE SURFACE CENTER OF ALETTA IS OBSCURED AND THERE HAVEN'T BEEN ANY RECENT MICROWAVE PASSES OVER THE CYCLONE. THE CURRENT LOCATION AND MOTION ARE THEREFORE SUBJECT TO SOME SPECULATION. WHAT LOW CLOUD LINES THAT ARE VISIBLE ARE ELONGATED AND SUGGESTIVE OF A NORTHEAST/ SOUTHWEST ORIENTED TROUGH AXIS...RATHER THAN A WELL-DEFINED CIRCULATION. NEVERTHELESS...THERE HAS BEEN AN ABUNDANCE OF DEEP CONVECTION OVER THE CENTER THIS AFTERNOON. DVORAK CLASSIFICATIONS ARE UNCHANGED AND THE INITIAL INTENSITY IS HELD AT 40 KT...ALTHOUGH THE DATA T NUMBERS SUGGEST THIS ESTIMATE MIGHT BE A LITTLE HIGH. OUTFLOW REMAINS RESTRICTED IN THE WESTERN SEMICIRCLE BUT LESS SO THAN EARLIER TODAY. THE TRACK FORECAST REMAINS DIFFICULT. THIS MORNING'S MODEL RUNS SHOW A LITTLE MORE RIDGING TO THE NORTH OF THE CYCLONE...AND THE NOGAPS NO LONGER BRINGS ALETTA TO THE COASTLINE. THE GFDL...HOWEVER... STILL TAKES ALETTA INLAND NEAR ACAPULCO. THE OFFICIAL FORECAST IS CLOSE TO THE PREVIOUS ADVISORY TRACK FOR THE FIRST 48 HOURS...AND CLOSER TO THE COAST THAN THE MODEL CONSENSUS OUT OF RESPECT FOR CONTINUITY AND THE GFDL. ALL GUIDANCE SAVE THE GFDL TAKES ALETTA WESTWARD LATE IN THE PERIOD SOUTH OF THE BUILDING SUBTROPICAL RIDGE...AND THE OFFICIAL FORECAST IS A LITTLE FASTER THAN THE PREVIOUS ADVISORY TRACK. THERE ARE SOME HINTS THAT THE WESTERLY SHEAR IS ABATING SOMEWHAT...AND GRADUAL STRENGTHENING IS FORECAST IN ACCORD WITH THE SHIPS GUIDANCE. THE THERMODYNAMIC ENVIRONMENT DOES NOT APPEAR CONDUCIVE FOR SIGNIFICANT DEVELOPMENT HOWEVER...AND BY 72 HOURS THE GLOBAL MODELS SUGGEST THAT WESTERLY SHEAR MAY AGAIN IMPACT THE TROPICAL CYCLONE. FORECASTER FRANKLIN FORECAST POSITIONS AND MAX WINDS INITIAL 28/2100Z 15.8N 101.0W 40 KT 12HR VT 29/0600Z 16.1N 100.9W 40 KT 24HR VT 29/1800Z 16.4N 100.9W 45 KT 36HR VT 30/0600Z 16.6N 101.1W 45 KT 48HR VT 30/1800Z 16.7N 102.0W 50 KT 72HR VT 31/1800Z 16.5N 103.5W 50 KT 96HR VT 01/1800Z 16.5N 105.0W 50 KT 120HR VT 02/1800Z 16.5N 106.5W 50 KT $$ NNNN
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Page last modified: Monday, 11-Sep-2006 11:28:39 UTC