MIAMI BEACH, Fla. (CBS) — Tropical Storm Gordon is expected to become a hurricane late Tuesday as it hits the central U.S. Gulf Coast, including Mississippi. From there, it’s forecast to move inland over the lower Mississippi Valley on Wednesday.

As the storm churned in the Gulf of Mexico, boaters evacuated to safe harbors, motorists left barrier islands and homeowners looked over yards that could soon be submerged in seawater. A number of schools called off classes, and red no-swimming flags flew along the shore as waves kicked up from the approaching storm.

Gordon formed into a tropical storm near the Florida Keys early Monday as it lashed the southern part of the state with heavy rains and high winds.

As of 8 a.m. ET Tuesday, the storm was centered some 190 miles east-southeast of the mouth of the Mississippi River and moving west-northwest at 15 mph, forecasters said. Maximum sustained winds were clocked at 65 mph.

The Miami-based National Hurricane Center said, “On the forecast track, the center of Gordon will move across the eastern gulf today, and will approach the north-central Gulf Coast within the warning area late this afternoon or evening, and move inland over the lower Mississippi Valley tonight or early Wednesday.”

A map made by the National Hurricane Center shows the projected path of Tropical Storm Gordon as of 8 a.m. ET on Sept. 4, 2018. (Credit: National Hurricane Center)

A hurricane warning was put into effect for the area stretching from the mouth of the Pearl River in Mississippi to the Alabama-Florida border. As much as 8 inches of rain could fall in some parts of the Gulf states through late Thursday, according to the hurricane center.

The center said the storm is also expected to bring “life-threatening” storm surge to portions of the central Gulf Coast. A storm surge warning has been issued for the area stretching from Shell Beach, Louisiana, to Dauphin Island, Alabama. The warning means there is danger of life-threatening inundation. The region could see rising waters of 3 to 5 feet.

Biloxi, Mississippi could be in Gordon’s path, notes the CBS affiliate there, WLOX-TV:

“The deepest water will occur along the immediate coast near and to the east of the landfall location, where the surge will be accompanied by large waves,” the center said.

Louisiana Gov. John Bel Edwards declared a state of emergency Monday and said 200 National Guard troops will be deployed to southeastern Louisiana.

The storm’s predicted track had shifted slightly east as of Monday evening, meaning Louisiana is currently just outside the area under the hurricane warning. Still, the southeastern part of the state remains under a tropical storm warning and residents need to be prepared for the storm to shift west, Edwards said.

“This storm has every possibility to track further in our direction,” Edwards said during a news conference Monday evening.

New Orleans Mayor LaToya Cantrell held an afternoon news conference and said the city has “the pumps and the power” needed to protect residents. But authorities issued a voluntary evacuation order for areas outside the city’s levee protection system, including the Venetian Isles, Lake Saint Catherine and Irish Bayou areas.

Cantrell urged residents within the levee protection area to stock up on supplies and shelter in place.

Miami Beach Police said via Twitter that the Labor Day holiday was “NOT a beach day,” with rough surf and potential rip currents. Red flags flew over Pensacola-area beaches in Florida’s Panhandle, where swimming and wading in the Gulf of Mexico was prohibited. More than 4,000 Florida Power & Light customers lost power Monday due to weather conditions.

Walter Augier, left, and Jhon M. fish as rain and wind are whipped up by Tropical Storm Gordon on Sept. 3, 2018, in Miami, Florida. (Photo by Joe Raedle/Getty Images)

The storm left many businesses on Florida’s Gulf Coast feeling shortchanged by the holiday weekend. The area has already been heavily impacted by this summer’s so-called “red tide”- massive algae blooms that have caused waves of dead marine life to wash up along the coast.

Jenna Wright, owner of a coffee shop in Naples, Florida, told the Naples Daily News she’d expected higher numbers for the Labor Day weekend.

“This is normally a decent weekend, but the storm and red tide aren’t helping,” Wright said. “We’re a beach coffee shop, and if people can’t go to the beach, then we won’t get any customers.”

Separately, Tropical Storm Florence continued to hold steady over the eastern Atlantic. Forecasters say little change in strength is expected in coming days and no coastal watches or warnings are in effect due to that storm.