Massive Saharan dust cloud to sweep across US in days and bring polluted air

A huge cloud of dust from the Sahara Desert is set to engulf southeastern regions of the US in the coming days after travelling across the Atlantic, forecasters have said. The Saharan air layer has carried sand and dust thousands of miles across the ocean, moving through the Caribbean and into parts of Florida. Meteorologists say the Atlantic drift will create an environment hostile to the development of hurricanes, injecting dry air into the atmosphere and leading to high temperatures. Miami-Dade county issued a warning over harmful particles potentially affecting air quality across the region to remain in effect until 3pm Eastern Time on Tuesday. It covers inland areas of Miami-Dade county, including Miami, Florida City and Hialeah. The phenomenon comes days after Tropical Storm Arthur briefly brought life-threatening flooding to the region last week. Map shows the Saharan air layer as of Tuesday, 23 June, 2026 (Cooperative Institute for Meteorological Satellite Studies / University of Wisconsin-Madison) The lack of moisture could “smother” storms before they have a chance to converge, while wind shear can help to break apart violent weather systems as they develop, according to Fox Weather. Saharan dust is formed when strong winds whip up dirt high into the sky over North Africa. The direction of the winds in the upper part of the atmosphere direct the matter and can carry it thousands of miles away, as far away as Britain to the north or the United States to the west. The matter is eventually deposited by rain as water droplets collect particles on the way down from the sky. On the ground, they evaporate and leave behind a thin film of dust that came together on another continent. The phenomenon is relatively common but in certain weather conditions it can also affect air pollution and pollution levels. South Florida was already battling thunderstorms linked to a heatwave and poor air quality linked to a string of wildfires in recent days. Storm Arthur brought flooding to the Gulf states, but Sahara dust could dry the air and help protect against converging storms (AP) The chance of rain and storms is likely to wane through the week as the Saharan dust and drier air moves in, CBS reports. Miami-based meteorologists told the Palm Beach Post that ‘feels like’ temperatures could reach 105-110F as the Sahara dust dries the air and evaporates clouds. The region is still reeling from the impact of tropical Storm Arthur, which formed near the Texas coast on 17 June to become the first named system of the 2026 Atlantic hurricane season. Forecasts indicated the storm total rainfall amounts could exceed 12 inches in some areas as others saw totals approaching 20 inches, according to Nasa. Near New Orleans, three tornadoes were confirmed, all with winds of 90-95mph. The storm had dissipated by 18 June due to wind shear and an ill-defined centre.