Overview
- Mexico’s SMN and CONAGUA warn that Tropical Wave No. 18, interacting with cyclonic circulations and upper-level troughs, will produce very heavy to locally intense rains with possible hail and electrical storms in states such as Michoacán, Guerrero, Oaxaca, Puebla and Veracruz.
- Forecast bulletins specify rainfall totals of 75–150 mm in the worst-hit areas and warn of floods, landslides and urban inundation that could raise rivers and block roads.
- Residents of Mexico City and municipalities in the State of Mexico are advised to expect afternoon-to-evening chubascos with electrical activity and temperature drops at the times listed by local forecasts.
- Northern and northwestern states face a separate threat from extreme heat with daytime highs forecast near 40–45 °C, creating heat-safety risks even as the south contends with storms.
- Argentina’s SMN issued yellow alerts for rain, snow, strong winds and Zonda for multiple provinces on Monday, and authorities in both countries urge people to follow Protection Civil and local meteorological updates and avoid risky travel during severe conditions.