TAMPA, Fla. (AP) — Florida residents loaded up on sandbags and evacuated from homes in low-lying areas along the Gulf Coast as Tropical Storm Idalia intensified Monday and forecasters predicted it would hit in days as a major hurricane with potentially life-threatening storm surges.

“You should be wrapping up your preparation for #TropicalStormIdalia tonight and Tues morning at the latest,” the National Weather Service in Tampa Bay said Monday on X, formerly known as Twitter.

As the state prepared, Idalia thrashed Cuba with heavy rain, especially in the westernmost part of the island, where the tobacco-producing province of Pinar del Rio is still recovering from the devastation caused by Hurricane Ian almost a year ago.

Authorities in the province issued a state of alert, and residents were evacuated to friends’ and relatives’ homes as authorities monitored the Cuyaguateje river for possible flooding. As much as 10 centimeters (4 inches) of rain fell in Cuba on Sunday, meteorological stations reported.

Idalia is expected to start affecting Florida with hurricane-force winds as soon as late Tuesday and arrive on the coast by Wednesday. It is the first storm to hit Florida this hurricane season and a potentially big blow to the state, which is also dealing with lingering damage from last year’s Hurricane Ian.

Idalia is also the latest in a summer of natural disasters, including wildfires in Hawaii, Canada and Greece; the first tropical storm to hit California in 84 years, and devastating flooding in Vermont.

“Just got to prepare for these things, hope for the best, and prepare for the worst and, you know, hunker down, as they say,” said Derek Hughes as he waited to load up his car with sandbags at a city park in Tampa.

Florida Gov. Ron DeSantis declared a state of emergency in 46 counties, a broad swath that stretches across the northern half of the state from the Gulf Coast to the Atlantic Coast. The state has mobilized 1,100 National Guard members, who have 2,400 high-water vehicles and 12 aircraft at their disposal for rescue and recovery efforts.

Tampa International Airport and St. Pete-Clearwater International Airport said they would close on Tuesday, and the Sunrail commuter rail service in Orlando was being suspended.

DeSantis warned of a “major impact” to the state, noting the potential for Idalia to become a Category 3 hurricane.

“The property — we can rebuild someone’s home,” DeSantis said during a news conference Monday. “You can’t unring the bell, though, if somebody stays in harm’s way and does battle with Mother Nature.”

DeSantis said the Florida Department of Transportation would waive tolls on highways in the Tampa area and the Big Bend starting at 4 a.m. Tuesday to help ease any burden on people in the path of the storm.

Large parts of the western coast of Florida are at risk for storm surges and floods. Evacuation notices have been issued in 21 counties with mandatory orders for some people in eight of those counties. Many of the notices were for people in low-lying and coastal areas, for those living in structures such as mobile and manufactured homes, recreational vehicles and boats, and for people who would be vulnerable in a power outage.

Pasco and Levy counties, located north of Tampa, both ordered mandatory evacuations for some residents. In Levy County, officials said residents of Cedar Key must be off the island by Tuesday evening because storm surges would make bridges impassable.

“Once the storm surge comes in, help may not be available to reach you,” the county said in a public advisory.

The National Hurricane Center in Miami issued a hurricane warning Monday from Longboat Key in the Sarasota area to the Holocene River, up past Tampa Bay.

Many school districts along the Gulf Coast said they would be closed Tuesday and Wednesday. Several colleges and universities said they would close their campuses on Tuesday, including the University of Florida in Gainesville.

“They told us that our dorm building, especially, is prone to flooding,” said Erin Amiss, a student at Eckerd College in St. Petersburg.

MacDill Air Force Base, located on Tampa Bay, is preparing to evacuate several aircraft and began a mandatory evacuation Monday morning for personnel who live in local counties, the Air Force said in a statement.

Tampa resident Grace Cruz, who has lived in the state for more than 40 years, put away patio furniture, filled her car up with gas and loaded up on sandbags. She worried about the tens of thousands of new residents to Florida who had never before experienced a hurricane, and she had some advice for them.

“If you’re planning to get away, you start ahead of time because of the traffic,” Cruz said. “No kidding. It’s horrible.”

As Gulf Coast residents packed up their cars or hauled out generators in case of power outages, state officials warned about potential fuel contamination at dozens of gas stations.

President Joe Biden spoke to DeSantis on Monday morning, telling the Florida governor that he had approved an emergency declaration for the state, the White House said in a news release. DeSantis is running for the Republican presidential nomination in 2024.

Southwest Florida is still recovering from Hurricane Ian, which was responsible last year for almost 150 deaths. The Category 5 hurricane damaged 52,000 structures, nearly 20,000 of which were destroyed or severely damaged.

At 11 p.m. EDT Monday, Tropical Storm Idalia was about 10 miles (16 kilometers) off the western tip of Cuba, with maximum sustained winds of 70 mph (110 kph), the hurricane center said. Idalia was moving north at 8 mph (13 kph). On Tuesday, it was expected to turn northeast at a faster pace, reaching Florida’s western coast as a dangerous major hurricane on Wednesday.

After moving across Florida, Idalia is forecast to blow through Georgia, South Carolina and North Carolina.

So far this year, the U.S. East Coast has been spared from cyclones. But in the West earlier this month, Tropical Storm Hilary caused widespread flooding, mudslides and road closures in Mexico, California, Nevada and points north.

The National Oceanic and Atmospheric Administration recently said the 2023 hurricane season would be far busier than initially forecast, partly because of extremely warm ocean temperatures. The season runs through Nov. 30, with August and September typically the peak.

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Associated Press writers Sarah Brumfield in Silver Spring, Maryland; Cristiana Mesquita in Havana; Mike Schneider in St. Louis, Missouri; and Lisa Baumann in Bellingham, Washington, contributed to this report.