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BATON ROUGE, La.  — Tropical Storm Francine churned in extremely warm waters in the Gulf of Mexico with increasing strength and was expected to reach hurricane status Tuesday before making landfall in Louisiana on Wednesday.

A hurricane warning was in effect along the Louisiana coast from the border with Texas eastward to Grand Isle, about 50 miles (80 kilometers) south of New Orleans, and a tropical storm warning extended eastward from there to the mouth of the Pearl River, according to the National Hurricane Center. A storm surge warning stretched from just east of Houston to the mouth of the Mississippi River south of New Orleans. Such a warning means there’s a chance of life-threatening flooding.

Louisiana Gov. Jeff Landry said citizens, especially in south Louisiana, have about a 24-hour window to “batten down all the hatches.” Forecasters said Francine’s landfall in south Louisiana was expected Wednesday afternoon or evening as a Category 2 hurricane with winds of 96 to 110 mph (155 to 175 kph).

When the storm does make landfall, Landry urged residents to stay in place rather than venturing out onto the roads and risk blocking first responders or utility crews who will be working to repair power lines.

By early Tuesday afternoon, Francine was still a tropical storm with maximum sustained winds of 65 mph (100 kph), according to the National Hurricane Center. The system was located about 380 miles (610 kilometers) southwest of Morgan City, Louisiana, and was moving northeast at 9 mph (14 kph).

The storm is moving over extremely warm Gulf waters that will serve as fuel to strengthen it. Water temperatures are about 87 degrees (31 degrees Celsius) where Francine is located, said Brian McNoldy, senior research associate at the University of Miami’s Rosenstiel School of Marine, Atmospheric, and Earth Science.

“The ocean heat content averaged over the entire Gulf is the highest it’s been on record for the date,” McNoldy wrote on his blog.

Across much of coastal Louisiana, residents boarded up windows, filled sandbags and made last-minute preparations ahead of Francine’s arrival.

In downtown New Orleans, cars and trucks were lined up for blocks to collect sandbags from the parking lot of a local YMCA, whose CEO Erika Mann said Tuesday that 1,000 bags of sand had already been distributed by volunteers.

“I love that these are community people that came out,” Mann said. “It’s a beautiful effort to do what we do in New Orleans, we’re resilient and we come together to help in the times we need each other.”

One resident picking up sandbags was Wayne Grant, 33, who moved to New Orleans last year and was nervous for his first potential hurricane in the city. The low-lying rental apartment he shares with his partner had already flooded out in a storm the year before and he was not taking any chances this time around.

“It was like a kick in the face, we’ve been trying to stay up on the weather ever since,” Grant said. “We’re super invested in the place, even though it’s not ours.”

Landry said the Louisiana National Guard is being deployed to parishes that could be impacted by Francine. They are equipped with food, water, nearly 400 high-water vehicles, about 100 boats and 50 helicopters to respond to the storm, including possible search-and-rescue operations.

Francine is the sixth named storm of the Atlantic hurricane season. There’s a danger of life-threatening storm surge as well as damaging, life-threatening hurricane-force winds, said Brad Reinhart, a senior hurricane specialist at the hurricane center.

There’s also the potential for 4 to 8 inches (10 to 20 centimeters) of rain with the possibility of 12 inches (30 centimeters) locally across much of Louisiana and Mississippi through Friday morning, Reinhart said. That heavy rainfall could also cause considerable flash and urban flooding.

Francine is barreling toward a Louisiana coastline that has yet to fully recover since hurricanes Laura and Delta decimated Lake Charles in 2020, followed a year later by Hurricane Ida. Over the weekend, a 22-story building in Lake Charles that had become a symbol of storm destruction was imploded after sitting vacant for nearly four years, its windows shattered and covered in shredded tarps.

Francine’s storm surge on the Louisiana coast could reach as much as 10 feet (3 meters) from Cameron to Port Fourchon and into Vermilion Bay, forecasters said.

“It’s a potential for significantly dangerous, life-threatening inundation,” said Michael Brennan, director of the hurricane center, adding it could also send “dangerous, damaging winds quite far inland.”

He said landfall was likely somewhere between Sabine Pass — on the Texas-Louisiana line — and Morgan City, Louisiana, about 220 miles (350 kilometers) to the east.

Residents of Baton Rouge, Louisiana’s capital, began forming long lines as people filled gas tanks and stocked up on groceries. Others filled sandbags at city-operated locations to protect homes from possible flooding.

“It’s crucial that all of us take this storm very seriously and begin our preparations immediately,” Baton Rouge Mayor-President Sharon Weston Broome said, urging residents to stock up on three days of food, water and essentials.

A mandatory evacuation was ordered for seven remote coastal communities by the Cameron Parish Office of Homeland Security & Emergency Preparedness. They include Holly Beach, a laid-back stretch dubbed Louisiana’s “Cajun Riviera,” where many homes sit on stilts. The storm-battered town has been a low-cost paradise for oil industry workers, families and retirees, rebuilt multiple times after past hurricanes.

In Grand Isle, Louisiana’s last inhabited barrier island, Mayor David Camardelle recommended residents evacuate and ordered a mandatory evacuation for those in recreational vehicles. Hurricane Ida decimated the city three years ago, destroying 700 homes.

In New Orleans, Mayor LaToya Cantrell urged residents to prepare to shelter in place. “Now is the time to finalize your storm plans and prepare, not only for your families but looking out for your neighbors,” she said.

City officials said they were expecting up to 6 inches (15 centimeters) inches of rain, gusty winds and “isolated tornado activity” with the most intense weather likely to reach New Orleans on Wednesday and Thursday.