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Tropical Storm Dolores Forecast Discussion Number 6
2021-06-19 16:37:13| National Hurricane Center (East Pacific)
Issued at 1000 AM CDT Sat Jun 19 2021 125 WTPZ44 KNHC 191437 TCDEP4 Tropical Storm Dolores Discussion Number 6 NWS National Hurricane Center Miami FL EP042021 1000 AM CDT Sat Jun 19 2021 Satellite imagery indicates that Dolores's center is moving onshore near the Michoacan/Colima border a little to the northwest of Punta San Telmo, Mexico. Within its last few hours over water, Dolores's satellite presentation continued to improve, and an SSMIS microwave pass from 1155 UTC showed that the storm has a large, well-defined mid-level eye surrounded by a nearly closed eyewall. Dolores appears to be very close to hurricane strength, and its current intensity is set at 60 kt as a compromise between estimates of T3.5 and T4.5 from TAFB and SAB, respectively. Dolores has been accelerating while approaching the coast, and its current motion is estimated to be toward the north-northwest (335 degrees) at 11 kt. With the center forecast to move farther inland through the day, the mountainous terrain of west-central Mexico is expected to disrupt the surface circulation, and the model guidance generally shows the low-level vorticity dissipating in about 12 hours, or less. To maintain continuity with previous forecasts, the NHC official forecast maintains a track for 24 hours, showing Dolores weakening fast and degenerating to a remnant low over west-central Mexico by this time tomorrow. However, it is entirely possible that the surface circulation will have dissipated by Sunday morning, with the associated rains continuing to spread northward with the remnant mid-level circulation. Even though Dolores is making landfall, the hurricane watch for the coast of Mexico is being maintained on this advisory since gusts to hurricane force could be occurring to the east of where the center is moving onshore. Key Messages: 1. Even though Dolores had made landfall, tropical storm conditions are still occurring within the tropical storm warning area and will spread farther inland across west-central Mexico through the day and tonight. Hurricane conditions, especially in gusts, are still possible for a few more hours within the hurricane watch area. 2. Heavy rains are forecast over coastal sections of the Mexican states of Oaxaca, 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 19/1500Z 18.6N 103.7W 60 KT 70 MPH...ON THE COAST 12H 20/0000Z 20.4N 104.2W 40 KT 45 MPH...INLAND 24H 20/1200Z 21.8N 104.6W 30 KT 35 MPH...POST-TROP/INLAND 36H 21/0000Z...DISSIPATED $$ Forecaster Berg
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