An enormous dust cloud has finally hit the United States, after journeying 5,000 miles from the Sahara Desert across the Atlantic Ocean. The plume darkened the skies in Puerto Rico earlier this week, causing some of the highest atmospheric aerosol concentrations the island had ever seen. By yesterday morning, the cloud had begun to creep … Continue reading Unprecedented Sahara Dust Storm Finally Hits the U.S. From Texas to Florida (Videos and Maps)