Overview
- Mexico’s national weather service issued alerts for July 30 to August 1 forecasting very strong to locally intense rains in southern states and temperatures above 45°C in parts of Baja California and Sonora.
- The heaviest downpours, with localized totals of 75–150 mm, are expected in eastern Oaxaca and central‑south Chiapas and carry risks of flash flooding, river rises, landslides, hail and electrical storms.
- A concurrent heat wave will push daytime highs above 45°C in northeast Baja California and northwest Sonora and produce widespread heat stress across northern and central states that could affect health and infrastructure.
- Forecasters link the split threats to the Mexican monsoon interacting with tropical wave No. 22, channels of low pressure and mid/upper‑level circulations and advise following SMN/Conagua notices and avoiding flood‑prone areas.
- Regional contrasts this weekend include a high chance of strong thunderstorms for the Buenos Aires metro area and mostly dry, warm weather in Galicia, with agencies noting a strong El Niño influence on seasonal patterns.