![]() |
HOME |
ACTIVE CYCLONES |
FORECASTS | IMAGERY | ABOUT TPC | RECONNAISSANCE |
---|
ZCZC MIATCDEP4 ALL TTAA00 KNHC DDHHMM TROPICAL DEPRESSION NINE-E DISCUSSION NUMBER 1 NATIONAL WEATHER SERVICE MIAMI FL 2 PM PDT FRI AUG 13 1999 THE TROPICAL DISTURBANCE THAT WAS LOCATED SEVERAL HUNDRED MILES SOUTHWEST OF THE SOUTHERN TIP OF BAJA CALIFORNIA HAS GOTTEN BETTER ORGANIZED DURING THE DAY. A WELL DEFINE LOW LEVEL CIRCULATION IS EVIDENT IN THE VISIBLE SATELLITE IMAGERY. WIND SPEEDS COMPUTED FROM SEVERAL OF THE LOW LEVEL CLOUD ELEMENTS GIVE VALUES THAT RANGE FROM 20 TO ALMOST 30 KNOTS. ALTHOUGH SOME OF THE CIRCULATION IS EXPOSED ON THE EAST SIDE OF THE LOW LEVEL CIRCULATION CENTER DEEP CONVECTION HAS BEEN PERSISTING ON THE WESTERN SIDE. T-NUMBERS HAVE INCREASED AND ARE NOW 2.0 FROM BOTH SAB AND MIAMI. THEREFORE...THE DISTURBANCE IS UP-GRADED TO TROPICAL DEPRESSION NINE-E. INITIAL MOTION IS ESTIMATED AT 285/12. THE SYSTEM IS EXPECTED TO MOVE IN THIS GENERAL DIRECTION UNTIL IT COMES UNDER THE INFLUENCE OF THE RIDGE TO THE NORTHWEST...AT WHICH TIME IT SHOULD TAKE MORE OF A WESTERLY DIRECTION SIMILAR TO ITS PREDECESSORS. THE GUIDANCE MODELS ARE IN GENERAL AGREEMENT WITH THIS SCENARIO. INTENSITY GUIDANCE MODELS DEVELOP THE SYSTEM RATHER SLOWLY. PART OF THIS MAY BE DUE TO SLIGHTLY COOLER SSTS CAUSED BY THE UP-WELLING FROM THE PASSAGE OF EUGENE AND DORA AS WELL AS A MORE STABLE ENVIRONMENT LEFT IN THEIR WAKE. JARVINEN FORECAST POSITIONS AND MAX WINDS INITIAL 13/2100Z 14.5N 117.6W 25 KTS 12HR VT 14/0600Z 15.0N 119.3W 30 KTS 24HR VT 14/1800Z 15.6N 121.4W 35 KTS 36HR VT 15/0600Z 16.0N 123.6W 40 KTS 48HR VT 15/1800Z 16.4N 125.8W 45 KTS 72HR VT 16/1800Z 17.0N 130.0W 50 KTS NNNN