At a Glance

Tropical Storm Marco is entering the Gulf of Mexico. Hurricane, storm surge watches have been issued for portions of Louisiana and Mississippi. It will likely become a hurricane by Sunday.Where, when and at what intensity it moves ashore along the Gulf Coast remains uncertain.

This is a previous version of our forecast for Marco. To see the latest updates, .

The Weather Company’s primary journalistic mission is to report on breaking weather news, the environment and the importance of science to our lives. This story does not necessarily represent the position of our parent company, .