ZCZC MIATCDEP1 ALL TTAA00 KNHC DDHHMM Tropical Depression Sixteen-E Discussion Number 2 NWS National Hurricane Center Miami FL EP162021 1000 AM CDT Sun Oct 10 2021 The depression is gradually getting better organized this morning, as a large mass of deep convection with clouds tops colder than -80 degrees C has developed over the cyclone's center. The initial advisory is held at 30 kt for this advisory and is based on the latest Dvorak intensity estimates from TAFB and SAB. The initial motion of the depression is 290/15 kt. This west-northwestward motion is forecast to continue through tonight as the cyclone moves along the southern periphery of a mid-tropospheric ridge located over Mexico. Early this week, a short-wave trough is expected to dig southward over the western United States and northern Mexico which would produce a weakness in the ridge. This should cause the cyclone to make a gradual turn to the north Monday through Tuesday night, with a northeastward motion expected by Wednesday. The track model guidance is in very good agreement on this scenario and the latest NHC forecast track is little changed from the previous one. Based on the forecast track, the center of the cyclone should pass near or south of the southern tip of the Baja California peninsula Tuesday night or early Wednesday, then reach the coast of west-central mainland Mexico Wednesday night or early Thursday. The recent increase in convection over the cyclone's center suggests that a bout of intensification is soon to get underway, and the depression is expected to become a tropical storm later today. The environment surrounding the depression is ideal for strengthening over the next 2 to 3 days, and it is possible that the system could undergo a period of rapid intensification (RI) during that time. The latest GFS-SHIPS RI guidance continues to indicate a greater than 40 percent chance of a 65-kt increase in strength over the next 72 h. Based on a blend of the latest HCCA and IVCN intensity solutions and the SHIPS RI guidance, the latest NHC intensity forecast is similar to the previous one, indicating the cyclone reaching 95 kt in 72 h. Although not explicitly shown in the forecast, the system could become a major hurricane before reaching the coast of mainland Mexico. Key Messages: 1. The tropical cyclone is forecast to be at or near major hurricane intensity when it reaches the coast of west-central mainland Mexico by late Wednesday or early Thursday, and could bring life-threatening storm surge, flash flooding, and dangerous winds to a portion of that area. Residents in this area should monitor the progress of this system and ensure they have their hurricane plan in place. 2. The tropical cyclone is expected to pass near or south of the southern tip of the Baja California peninsula as a hurricane Tuesday night or Wednesday, and could bring strong winds and heavy rainfall to the extreme southern portion of the peninsula. Watches could be required for portions of this area tonight or early Monday. FORECAST POSITIONS AND MAX WINDS INIT 10/1500Z 14.8N 104.7W 30 KT 35 MPH 12H 11/0000Z 15.4N 106.6W 40 KT 45 MPH 24H 11/1200Z 16.0N 108.2W 50 KT 60 MPH 36H 12/0000Z 17.1N 109.4W 65 KT 75 MPH 48H 12/1200Z 18.4N 110.0W 75 KT 85 MPH 60H 13/0000Z 19.9N 109.9W 85 KT 100 MPH 72H 13/1200Z 21.8N 109.0W 95 KT 110 MPH 96H 14/1200Z 26.3N 105.5W 55 KT 65 MPH...INLAND 120H 15/1200Z...DISSIPATED $$ Forecaster Latto NNNN
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Page last modified: Friday, 31-Dec-2021 12:10:10 UTC