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4w ago

Tropical Storm Mario Forms Off Southwest Mexico, Triggers Watch and Heavy-Rain Threat

Forecasters warn the storm’s compact core makes its evolution unusually uncertain.

Satellite image of Tropical Storm Mario at 18:10 UTC on September 12, 2025. Credit: NOAA/GOES-East, RAMMB/CIRA, The Watchers
Tracker map from the National Hurricane Center for Tropical Storm Mario on Friday.
Image

Overview

  • The National Hurricane Center upgraded the system to Tropical Storm Mario with maximum sustained winds near 40 mph and a minimum central pressure around 1006 hPa.
  • At 18:00 UTC the center was about 80 miles WSW of Zihuatanejo and 55 miles SW of Lazaro Cardenas, moving west-northwest near 14 mph roughly parallel to the coast.
  • The Government of Mexico issued a Tropical Storm Watch from Lazaro Cardenas to Punta San Telmo, with tropical-storm conditions possible along parts of the Michoacan coast today.
  • Heavy rainfall of 2 to 4 inches, with local amounts up to 6 inches, is forecast across southern Mexico through Sunday, raising a risk of flash flooding in higher terrain.
  • Forecasts indicate the system will skirt the coast before shifting farther offshore on Saturday and then over cooler waters by day five, likely becoming post-tropical, though model guidance ranges from inland dissipation to potential strengthening.