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 massive plume of Saharan dust is covering the Caribbean and is making its way toward the southern U.S. While it is bad for air quality, it prevents major storms and hurricanes from developing. CBS News' Karen Hua has more details.