ZCZC MIATCDEP1 ALL TTAA00 KNHC DDHHMM TROPICAL DEPRESSION ELEVEN-E DISCUSSION NUMBER 1 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 2 PM PDT MON AUG 30 2004 VISIBLE AND INFRARED SATELLITE IMAGERY INDICATES THAT THE TROPICAL DISTURBANCE SOUTHWEST OF ACAPULCO HAS BECOME ORGANIZED ENOUGH TO BE CLASSIFIED AS A TROPICAL DEPRESSION. CURRENT SATELLITE INTENSITY ESTIMATES REFLECT THIS WITH A CONSENSUS 2.0 FROM TAFB AND SAB. AFWA CLASSIFIED THE SYSTEM WITH A 1.5 BASED ON THE PATTERN T...BUT THE DATA T NUMBER WAS ALSO A 2.0. IN ADDITION...QUIKSCAT AMBIGUITY DATA AND MICROWAVE IMAGERY PROVIDE ENOUGH SUPPORT FOR A SURFACE CIRCULATION BOUNDED BY CONVECTION PRIMARILY OVER THE WESTERN SEMICIRCLE. THE DEPRESSION BEGINS WITH AN INITIAL INTENSITY OF 30 KT. INITIAL MOTION IS AN UNCERTAIN 300/6. THE DEPRESSION IS MOVING SLOWLY TO THE WEST-NORTHWEST ON THE SOUTHERN PERIPHERY OF A WEAK MID-LEVEL RIDGE WHICH EXTENDS ACROSS MEXICO AND IS ANCHORED BY AN ANTICYCLONE OVER SOUTHERN CALIFORNIA. THIS GENERAL MOTION IS EXPECTED OVER THE FIRST 48 HOURS BUT AN ACCELERATION IS ANTICIPATED THEREAFTER AS THE SYSTEM BECOMES MORE UNDER THE INFLUENCE OF THE RIDGE AND IS STEERED BY STRONGER DEEP-LAYERED FLOW. IN THE 4 TO 5 DAY RANGE...A LONGWAVE TROUGH IS EXPECTED TO MOVE ACROSS THE WESTERN UNITED STATES. THIS MAY PROVIDE JUST ENOUGH WEAKNESS IN THE RIDGE TO ALLOW FOR A SLOWER AND POTENTIALLY MORE NORTHWARD MOTION...BUT THIS IS VERY RELIANT ON THE STRENGTH OF THE SYSTEM AT THAT TIME. THE NOGAPS FAVORS A STRONG TROUGH AND THE UKMET FAVORS A SHALLOW TROUGH. THE OFFICIAL FORECAST FOLLOWS THE GFS SOLUTION WHICH IS A COMPROMISE OF THE NOGAPS AND UKMET. THE OFFICIAL INTENSITY FORECAST GRADUALLY STRENGTHENS THE DEPRESSION TO 60 KT BY 72 HOURS. THE SYSTEM WILL BEGIN MOVING OVER WATER TEMPERATURES BELOW 26C AFTER 72 HOURS SO SLIGHT WEAKENING IS ANTICIPATED THEREAFTER. VERTICAL SHEAR IS EXPECTED TO BE MARGINAL THROUGH THE FORECAST PERIOD AND THIS SHOULD PLAY A CRITICAL PART IN HOW STRONG THE SYSTEM WILL ULTIMATELY BECOME. FORECASTER BERG/PASCH FORECAST POSITIONS AND MAX WINDS INITIAL 30/2100Z 12.5N 103.9W 30 KT 12HR VT 31/0600Z 13.0N 104.9W 35 KT 24HR VT 31/1800Z 13.9N 106.8W 40 KT 36HR VT 01/0600Z 14.8N 108.7W 45 KT 48HR VT 01/1800Z 16.0N 111.0W 50 KT 72HR VT 02/1800Z 18.5N 115.5W 60 KT 96HR VT 03/1800Z 20.5N 119.5W 60 KT 120HR VT 04/1800Z 22.0N 123.0W 50 KT $$ NNNN
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Page last modified: Monday, 30-Aug-2004 20:33:50 UTC