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Tropical Storm Dolores Forecast Discussion Number 7
2021-06-19 22:38:19| National Hurricane Center (East Pacific)
Issued at 400 PM CDT Sat Jun 19 2021 000 WTPZ44 KNHC 192038 TCDEP4 Tropical Storm Dolores Discussion Number 7 NWS National Hurricane Center Miami FL EP042021 400 PM CDT Sat Jun 19 2021 Dolores's circulation, and the associated weather, continue to move farther inland over west-central Mexico, but it's hard to tell how much of a surface circulation remains over the mountainous topography of the region. Deep convection continues to develop near the estimated center, likely with the help of some orographic lift of onshore flow. Based on a typical decay rate over land, Dolores's intensity is set at 45 kt, but there is higher-than-normal uncertainty in this estimate given the effects of the terrain. The heading remains toward the north-northwest (345 degrees), but the speed has increased to 15 kt, likely due to the mid-level circulation rotating around a mid-level low centered near Socorro Island. If the surface circulation has not yet been mangled by the mountainous terrain, it will soon, and the mid-level circulation should then continue north-northwestward through tonight. The new NHC forecast shows continued rapid weakening and depicts Dolores as a remnant low in 12 hours, but in reality the circulation may have dissipated by that time. This forecast reasoning follows the quick dissipation of vorticity indicated in the global model fields. Even though Dolores is moving farther inland, the coastal watches and warnings are being maintained on this advisory until there is no longer a threat of tropical-storm-force winds in those areas. Key Messages: 1. Tropical storm conditions are still occurring within the tropical storm warning area and will spread farther inland across west-central Mexico through tonight. 2. Heavy rains are forecast over coastal sections of the Mexican states of Guerrero, Michoacan, Colima, Jalisco, Nayarit, and southern Sinaloa through the weekend, which could result in life-threatening flash flooding and mudslides. FORECAST POSITIONS AND MAX WINDS INIT 19/2100Z 20.3N 104.1W 45 KT 50 MPH...INLAND 12H 20/0600Z 22.5N 104.5W 25 KT 30 MPH...POST-TROP/INLAND 24H 20/1800Z...DISSIPATED $$ Forecaster Berg
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