ZCZC MIATCDAT2 ALL TTAA00 KNHC DDHHMM TROPICAL DEPRESSION HENRI DISCUSSION NUMBER 19 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 5 AM EDT MON SEP 08 2003 SATELLITE IMAGERY...INFRARED AND MICROWAVE...SHOWS THAT HENRI IS LOSING THE TROPICAL CHARACTERISTICS OF A WELL-DEFINED LOW-LEVEL CIRCULATION AND ORGANIZED CONVECTION AND MAY BE TRANSFORMING INTO AN EXTRATROPICAL SYSTEM. THE LESS SAID...THE BETTER...ABOUT DIAGNOSING THE PHASE OR ENERGETICS OF A CYCLONE. VERTICAL SHEAR IS 30 KNOTS INCREASING SOON TO 40 KNOTS. THE MAXIMUM 1-MIN WIND SPEED IS ESTIMATED AT 30 KNOTS. THE 00Z GFS RUN SHOWS HENRI TO BE A SHALLOW LOW TRAPPED TO THE SOUTH OF A BUILDING RIDGE OVER THE NEXT 5 DAYS. THE FORECAST SLIGHT STRENGTHENING IS BASED ON THE GFS FORECAST OF INCREASING PRESSURE GRADIENT TO THE NORTH OF THE CENTER. THE INITIAL MOTION ESTIMATE IS AN UNCERTAIN 055/07. IT IS ASSUMED THAT THE CENTER WAS JUST WEST OF DATA BUOY 41002 AT 06Z SINCE THE WIND SHIFTED FROM SOUTHEAST TO SOUTH AT 06Z. THE CIRCULATION MAY BE STRETCHED OR ELONGATED...AS SUGGESTED BY A 23Z QUIKSCAT PASS. THE FORECAST TRACK IS A LITTLE SLOWER THAN THE PREVIOUS ADVISORY AFTER 24 HOURS. FORECASTER LAWRENCE FORECAST POSITIONS AND MAX WINDS INITIAL 08/0900Z 32.5N 75.9W 30 KT 12HR VT 08/1800Z 33.3N 74.9W 30 KT...EXTRATROPICAL 24HR VT 09/0600Z 33.8N 74.0W 35 KT...EXTRATROPICAL 36HR VT 09/1800Z 34.3N 73.0W 40 KT...EXTRATROPICAL 48HR VT 10/0600Z 34.8N 72.0W 35 KT...EXTRATROPICAL 72HR VT 11/0600Z 35.0N 71.0W 35 KT...EXTRATROPICAL 96HR VT 12/0600Z 35.0N 70.5W 30 KT...EXTRATROPICAL 120HR VT 13/0600Z 35.0N 70.0W 25 KT...EXTRATROPICAL NNNN
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Page last modified: Monday, 07-Feb-2005 16:49:58 UTC