An employee of the Emergency Operations Center (EOC) monitors tropical storm Laura in Santo Domingo, on August 22, 2020.
Erika Santelices | AFP | Getty Images
Tropical storms Marco and Laura were expected to develop into hurricanes as they gained strength and aimed for an unprecedented twin strike next week on the mainland U.S.
Marco entered the Gulf of Mexico Saturday evening and was headed toward landfall in Louisiana or Mississippi Monday afternoon, according to National Hurricane Center projections. Hurricane status could come as early as Saturday night, federal forecasters said.
Laura, over the eastern area of the Dominican Republic Saturday, was expected to strengthen to a hurricane by…