ZCZC MIATCDEP2 ALL TTAA00 KNHC DDHHMM Tropical Storm Aletta Discussion Number 19 NWS National Hurricane Center Miami FL EP022018 300 AM MDT Sun Jun 10 2018 After being devoid of thunderstorms for some time, a burst of deep convection developed over the northern semicircle of Aletta. This has probably made the weakening of the cyclone a little less rapid than had been occurring over the last day or so. The current intensity estimate is down to 45 kt based on a blend of subjective Dvorak estimates from TAFB and SAB along with objective Dvorak estimates from UW-CIMSS. In spite of the recent increase of thunderstorm activity, which is thought to be temporary, strong shear and marginal SSTs are likely to cause continued weakening and Aletta is expected to degenerate into a remnant low in a day or so. This is consistent with the intensity model consensus. The system continues to move slowly westward, or around 280/5 kt. A weak low- to mid-level ridge to the north of Aletta should maintain this general motion for a few days. Later in the period, steering currents are forecast to become very weak, and little motion is indicated at days 4 and 5. By that time, however, Aletta should be a very weak post-tropical cyclone. The official forecast is similar to the previous one and on the southern side of the track model guidance suite. FORECAST POSITIONS AND MAX WINDS INIT 10/0900Z 16.0N 114.5W 45 KT 50 MPH 12H 10/1800Z 16.1N 115.5W 35 KT 40 MPH 24H 11/0600Z 16.1N 116.8W 30 KT 35 MPH 36H 11/1800Z 16.0N 117.9W 25 KT 30 MPH...POST-TROP/REMNT LOW 48H 12/0600Z 15.9N 119.0W 25 KT 30 MPH...POST-TROP/REMNT LOW 72H 13/0600Z 15.8N 120.7W 25 KT 30 MPH...POST-TROP/REMNT LOW 96H 14/0600Z 15.6N 121.0W 20 KT 25 MPH...POST-TROP/REMNT LOW 120H 15/0600Z 15.4N 121.2W 15 KT 15 MPH...POST-TROP/REMNT LOW $$ Forecaster Pasch NNNN
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Page last modified: Monday, 31-Dec-2018 12:10:12 UTC