After making its way across the Atlantic Ocean, a massive cloud of dust from the Sahara Desert is expected to reach the U.S. on Wednesday afternoon.

SAN JUAN, Puerto Rico — A massive cloud of dust from the Sahara Desert blanketed most of the Caribbean on Monday in the biggest event of its kind this year as it heads toward the United States.

A significant weather event is unfolding this week as a massive cloud of dust from the Sahara Desert is heading toward the southeastern United States. This annual occurrence, part of the atmospheric phenomenon known as the Saharan Air Layer,