Overview

• Argentina’s Servicio Meteorológico Nacional has issued yellow warnings across the AMBA and nine provinces ahead of a South Atlantic cyclogenesis forecast to dump 50–100 mm of rain and gusty winds between August 19 and 20.
• Forecasters note significant divergence between ECMWF and GFS tracks, meaning some locations could receive double their typical monthly rainfall and face heightened flood and wind-damage risk.
• Mexico’s Conagua and SMN predict heavy to very heavy monsoon-driven downpours on August 18, with Chiapas singled out for 75–150 mm and urban areas warned of severe afternoon-evening thunderstorms.
• Extreme heat alerts persist in Baja California, where temperatures above 45 °C threaten heat-related health impacts in lowland and desert communities.
• Spain’s AEMET reports that its 16-day August heatwave has ended with maximum temperatures plunging by up to 10 °C and forecasts renewed showers and storms in northern regions such as Asturias, aiding wildfire relief.