Overview

• The Saharan dust plume has blanketed much of the Caribbean, recording a peak aerosol optical depth of 0.55—the highest level this season.
• The dry, dust-laden Saharan Air Layer typically suppresses tropical cyclone formation by limiting atmospheric moisture and increasing wind shear.
• Meteorologists project the plume will arrive in Florida by Thursday and extend across the Gulf Coast into late weekend.
• Air quality alerts in Puerto Rico and Caribbean territories advise residents with asthma and allergies to remain indoors or wear masks, with similar warnings expected in U.S. states.
• Annual Saharan dust outbreaks between April and October can enhance sunsets with vibrant hues and deposit nutrients that fertilize distant ecosystems.