Spain and Brazil Swelter as Sahara Dust Tints Skies While Storms Threaten Southern Africa

**TL;DR** Spain and Brazil are forecast to see extreme heat while a Sahara dust plume turns skies orange, and southern Africa braces for intense thunderstorms.

## Context A south‑westerly flow from North Africa is pushing warm air over the Iberian Peninsula, lifting daytime temperatures far above late‑April norms. At the same time, a dust plume lifted from the Sahara is expected to travel northward, scattering sunlight and giving sunrise and sunset skies an orange‑red hue across Spain and southwest France. In Brazil, high pressure is building over the central‑south, driving temperatures into the high 30s °C. Meanwhile, a low‑pressure system over the southern Atlantic is feeding moisture into Botswana and South Africa, setting the stage for heavy showers. Over the United States, a ridge of high pressure is bringing unusually warm air to the northwest, raising temperatures well above seasonal averages.

## Key Facts - Madrid is forecast to reach 30 °C on Tuesday, which is 10 °C above the typical late‑April average according to Spain’s State Meteorological Agency (AEMET) and the ECMWF ensemble model. - Seville is expected to hit 34 °C, roughly 9 °C higher than its usual late‑April temperature, based on the same AEMET‑ECMWF forecast. - Botswana and South Africa could experience thunderstorms with rainfall rates of 20‑30 mm per hour, posing flood, lightning and hail hazards, as indicated by the South African Weather Service and Botswana Meteorological Services using radar‑based nowcasting. - The Sahara dust plume, tracked by the Copernicus Atmosphere Monitoring Service (CAMS) via satellite aerosol optical depth, is projected to cover Iberia and southwest France, creating orange‑tinged skies at dawn and dusk. - In Brazil, daytime maximum temperatures are expected to reach the high 30s °C, about 5‑10 °C above the seasonal average, according to the National Institute of Meteorology (INMET) using its regional forecast model. - The northwestern United States (Montana, Nebraska, North and South Dakota) could see temperatures above 30 °C, roughly 15 °C above normal, as reported by the NOAA Climate Prediction Center’s medium‑range outlook.

## What It Means The anomalous heat raises health risks such as heat exhaustion and strains energy demand for cooling. The dust plume can reduce air quality and affect solar panel output. Intense thunderstorms increase flash‑flood risk and could disrupt transport and agriculture. Unusual warmth in the US may accelerate snowmelt and elevate wildfire risk later in the season.

Watch for updates on temperature peaks, dust concentration levels, and storm warnings over the next 48 hours as agencies refine their forecasts.