Overview
- Mexico's SMN and CONAGUA warn that between Aug. 11 and 13 parts of the south and southeast may receive 75–150 mm of rain, raising the risk of flash floods and landslides in vulnerable valleys and mountain slopes.
- Forecasts for Mexico City and the Valley of Mexico call for strong afternoon and evening storms on Tuesday with lightning, possible hail, and short windows of heavy rainfall around 15:00, 18:00 and 21:00 that can cause urban inundation.
- An entrenched mid‑level anticyclone will keep an extreme heat episode in place across northern and Pacific‑border states with daytime highs of 40–45 °C while gusts of about 60–70 km/h and a Pacific 'mar de fondo' of 1.5–2.5 m threaten coastal areas.
- Argentina's SMN has issued 72‑hour orange and yellow alerts for Andean provinces for a polar cold mass that will bring mountain snow accumulations of roughly 15–25 cm and Zonda or strong wind advisories for provinces such as Mendoza and Neuquén.
- Local authorities and meteorological services have scheduled updated forecasts and urge people to follow Protección Civil guidance, avoid prolonged cold or heat exposure, and prepare for travel disruptions and water or power impacts.