Overview
- By Thursday, Oct. 8 Mexico’s SMN reported the Gulf system had organized into tropical storm Isaías with about 75 km/h sustained winds and forecast it to reach hurricane category 1 on Oct. 8 and possibly category 2 on Oct. 9.
- A second system, Depression 20‑E off the southern Pacific coast expected to become Simón, is forecast to strengthen and bring torrential rain to Guerrero, Oaxaca and nearby states with localized totals of 75–250 mm in the worst areas.
- Conagua and the SMN issued coastal warnings for strong gusts and high surf with waves of 3–4 meters possible along parts of Colima, Michoacán and Guerrero and gusts commonly in the 50–70 km/h range.
- In Argentina the SMN kept orange alerts across the AMBA and provinces including Corrientes, Misiones, Santa Fe and Chaco after storms on Oct. 7 that produced urban flooding, hail, transit disruptions and some evacuations.
- Authorities in both countries urge people to follow official channels, avoid maritime activity, secure loose objects, prepare for evacuations in flood‑prone areas and expect cascading impacts such as river rises, landslides and flash floods.