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ZCZC MIATCDEP5 ALL TTAA00 KNHC DDHHMM TROPICAL DEPRESSION FERNANDA DISCUSSION NUMBER 17 NATIONAL WEATHER SERVICE MIAMI FL 8 AM PDT SAT AUG 21 1999 SATELLITE IMAGERY CONTINUES TO SHOW A LOW- TO MID-LEVEL CIRCULATION WITH OCCASIONAL FLARE-UPS OF CONVECTION. INITIAL INTENSITY REMAINS 30 KNOTS IN AGREEMENT WITH DVORAK ESTIMATES FROM TAFB AND SAB. LOW TO MID LEVEL STEERING SHOULD ALLOW THE GENERAL MOTION TOWARD THE WEST-SOUTHWEST TO PERSIST. THIS MOTION WILL KEEP THE TROPICAL CYCLONE OVER RELATIVELY WARM WATER SO IT WILL LIKELY BE SLOW TO DISSIPATE. THIS FORECAST BASICALLY UPDATES THE PREVIOUS PACKAGE. MAYFIELD FORECAST POSITIONS AND MAX WINDS INITIAL 21/1500Z 15.4N 128.5W 30 KTS 12HR VT 22/0000Z 15.0N 129.8W 30 KTS 24HR VT 22/1200Z 14.7N 131.6W 30 KTS 36HR VT 23/0000Z 14.5N 133.3W 30 KTS 48HR VT 23/1200Z 14.5N 135.1W 30 KTS 72HR VT 24/1200Z 14.5N 138.5W 25 KTS NNNN