This article was published more than 2 years agoCommentGift Share(This article, first published on Monday afternoon, was updated Tuesday midday.)A nearly 4,000-mile-long plume of thick dust from the Sahara Desert that arrived in Puerto Rico, Hispaniola and Cuba is forecast to move into the Gulf of Mexico, inland from Texas to the lower Mississippi River Valley Thursday and Friday, before reaching Washington this weekend.The plume is part of a phenomena that develops every year off the coast of Africa, known as the Saharan Air Layer (SAL), but the current one is unusually intense and is...…This article was published more than 2 years agoCommentGift Share(This article, first published on Monday afternoon, was updated Tuesday midday.)A nearly 4,000-mile-long plume of thick dust from the Sahara Desert that arrived in Puerto Rico, Hispaniola and Cuba is forecast to move into the Gulf of Mexico, inland from Texas to the lower Mississippi River Valley Thursday and Friday, before reaching Washington this weekend.The plume is part of a phenomena that develops every year off the coast of Africa, known as the Saharan Air Layer (SAL), but the current one is unusually intense and is...WW…