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Hurricane Lane Forecast Discussion Number 13
2018-08-18 04:34:58| National Hurricane Center (East Pacific)
Issued at 800 PM PDT Fri Aug 17 2018 678 WTPZ44 KNHC 180234 TCDEP4 Hurricane Lane Discussion Number 13 NWS National Hurricane Center Miami FL EP142018 800 PM PDT Fri Aug 17 2018 Lane has continued to rapidly intensify during the past several hours, with the eye gradually becoming better defined and the central dense overcast surrounding the eye becoming larger. Satellite intensity estimates have increased to a range of 100-115 kt, and based on this the initial intensity is increased to 105 kt in best agreement with the CIMSS satellite consensus technique. The hurricane currently has good outflow in all directions and there is a large area of outer banding, primarily in the southeastern semicircle. The first portion of the intensity forecast is a bit problematic. With the exception of the HMON model, none of the intensity guidance shows much additional strengthening. However, except for the possibility of some dry air wrapping around the west side of the central convection, there is no apparent reason why the current rapid intensification should stop that quickly. The intensity forecast will show 12 h more of rapid intensification, followed by a period of little change from 12-48 h. This portion of the intensity forecast lies above all of the guidance. After 48 h, Lane should start to encounter westerly shear, which should increase by the end of the forecast period and cause the cyclone to steadily weaken. This portion of the intensity forecast lies near or a little above the intensity consensus. The initial motion is 280/14. Lane is forecast to move south of a subtropical ridge in either a westward or west-northwestward direction over the next 5 days, with some decrease in forward speed by 72-120 h as the ridge weakens slightly. There is some spread in the guidance by 120 h, with the GFS and the NAVGEM models on the north side of the guidance envelope and the ECMWF model and UKMET Ensemble mean on the south side. As in the previous advisory, little change was made to the forecast track which lies close to the center of the guidance envelope and the consensus models. FORECAST POSITIONS AND MAX WINDS INIT 18/0300Z 11.8N 135.6W 105 KT 120 MPH 12H 18/1200Z 12.2N 137.7W 120 KT 140 MPH 24H 19/0000Z 12.7N 140.4W 120 KT 140 MPH 36H 19/1200Z 13.4N 142.7W 120 KT 140 MPH 48H 20/0000Z 13.9N 145.0W 115 KT 130 MPH 72H 21/0000Z 14.5N 149.0W 100 KT 115 MPH 96H 22/0000Z 15.0N 152.5W 80 KT 90 MPH 120H 23/0000Z 15.5N 156.5W 65 KT 75 MPH $$ Forecaster Beven
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