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 this afternoon.

Life-threatening storm surge and hurricane-force winds are expected along portions of the U.S. Gulf Coast.

Marco is expected to make landfall in southeastern Louisiana or Mississippi tomorrow.

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.