Overview
- Mexico’s Servicio Meteorológico Nacional issued forecasts on Tuesday 11 August calling for very heavy rains of 75–150 mm in parts of Veracruz, Oaxaca, Chiapas, Tabasco and isolated eastern Sonora through 13 August.
- The same forecasts say a persistent anticyclonic circulation will keep northern and Pacific coastal states unusually hot with daytime highs of 40–45 °C, raising heat‑exposure risks even where storms are expected elsewhere.
- SMN and Conagua warn storms may include lightning, hail and rapid river rises that can trigger landslides, flash floods and urban inundation, especially in mountainous and low‑lying zones.
- Coastal and wind hazards will accompany the rains and heat with gusts near 60–70 km/h and Pacific swell of 1.5–2.5 m, and local forecasts for Mexico City predict strong afternoon‑evening showers roughly between 15:00 and 21:00 on Tuesday.
- Argentina’s SMN has active 72‑hour cold alerts for a polar mass that will bring snow to Andean provinces such as Mendoza and Neuquén and strong winds, and officials in both countries urge following Protección Civil, SMN and Conagua updates for local warnings and safety guidance.