Tropical Storm Marco, which is making its way toward Louisiana, has become a hurricane, according to the National Hurricane Center.

“#Marco has become a hurricane, according to data from the Air Force @403rdWing Hurricane Hunters. Maximum winds are 75 mph (120 km/h) with higher gusts,” the National Hurricane Center tweeted early Sunday afternoon.

TROPICAL STORMS MARCO AND LAURA HERALD 'CRAZY' FEW DAYS IN THE GULF OF MEXICO

Life-threatening storm surge and hurricane-force winds are expected along portions of the U.S. Gulf Coast, the National Hurricane Center warned, in a statement.

Marco is expected to make landfall in southeastern Louisiana or Mississippi Monday, sometime from mid-morning to mid-afternoon.

Tropical Storm Laura is also projected to hit the Gulf Coast, possibly as a hurricane, later this week. Laura is expected to make landfall about 36 to 48 hours after Marco in the same general area.

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Fox News’ Rick Reichmuth, Brie Stimson and the Associated Press contributed to this article. Follow James Rogers on Twitter @jamesjrogers