ZCZC MIATCDEP2 ALL TTAA00 KNHC DDHHMM Tropical Depression Twelve-E Discussion Number 1 NWS National Hurricane Center Miami FL EP122021 400 AM CDT Tue Aug 10 2021 Over the past several hours, showers and thunderstorms have showed increased signs of organization in association with an area of low pressure located a few hundred miles south of Acapulco, Mexico. An ASCAT-B pass around 0330 UTC revealed that the low has developed a well-defined center and is producing 25 to 30-kt winds, with some higher wind vectors flagged as rain contaminated within the deep convection occurring to the south and west of the center. The system has become sufficiently organized to be classified as a tropical depression, and its initial intensity is set at 30 kt for this advisory. The estimated motion of the depression is west-northwest, or 290/7 kt. The system is expected to generally move west-northwestward to westward over the next several days, as it is steered by a ridge to its north and northeast. This track is roughly parallel to, but well offshore of, the southwestern coast of Mexico. The track guidance is in reasonably good agreement, and the official NHC forecast lies near the center of the guidance envelope. The depression is located in a moist, unstable environment with ample oceanic heat content to fuel strengthening during the next few days. However, moderate to strong northerly vertical wind shear will likely prevent rapid intensification of this system in the short term. Nonetheless, the intensity guidance unanimously supports strengthening, and this system is likely to become a tropical storm later today. Continued strengthening is forecast through the rest of the week and into the weekend, and the cyclone could reach hurricane strength by Thursday. The official NHC intensity forecast generally follows the IVCN consensus aid and shows the system's intensity peaking on days 4 and 5, when the wind shear is forecast to diminish while the cyclone remains over warm SSTs. FORECAST POSITIONS AND MAX WINDS INIT 10/0900Z 13.0N 100.8W 30 KT 35 MPH 12H 10/1800Z 13.7N 102.0W 40 KT 45 MPH 24H 11/0600Z 14.3N 103.6W 45 KT 50 MPH 36H 11/1800Z 14.5N 105.3W 50 KT 60 MPH 48H 12/0600Z 14.7N 106.5W 60 KT 70 MPH 60H 12/1800Z 15.3N 107.9W 65 KT 75 MPH 72H 13/0600Z 16.3N 109.4W 70 KT 80 MPH 96H 14/0600Z 18.2N 113.3W 80 KT 90 MPH 120H 15/0600Z 19.0N 117.5W 80 KT 90 MPH $$ Forecaster Reinhart/Pasch NNNN
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Page last modified: Friday, 31-Dec-2021 12:10:02 UTC