Hurricane Ian continued to intensify Monday night, with maximum sustained winds now at 105 mph.

The hurricane is about 105 miles east-southeast of the western tip of Cuba, which is expected to see significant wind and storm surge impacts soon.

The storm is expected to become a major hurricane overnight or Tuesday morning.

-ABC News' Melissa Griffin

Tampa International Airport will stop all operations starting 5 p.m. Tuesday to secure its airfield and terminals ahead of Hurricane Ian's expected landfall later this week.

The U.S. Department of Health and Human Services has declared a public health emergency for the state of Florida.

HHS Secretary Xavier Becerra made the declaration Monday to address the possible health impacts for Florida residents once Hurricane Ian nears the state.

"We will do all we can to assist Florida officials with responding to the health impacts of Hurricane Ian," Becerra said in a statement. "We are working closely with state, local, and tribal health authorities, as well as our federal partners, and stand ready to provide additional public health and medical support."

HHS has pre-positioned two 15-person health and medical task force teams from its National Disaster Medical System, as well as a 13-person incident management team and two pharmacists to assist with the response in Florida.

"These teams are highly trained and ready to respond if, when, and where they may be needed following the storm," HHS Assistant Secretary for Preparedness and Response Dawn O’Connell said.

Florida Gov. Ron DeSantis declared a state of emergency on Saturday. That declaration was approved by President Joe Biden on Sunday.

The National Hurricane Center has issued a hurricane warning for the Tampa Bay area just after its 5 p.m. advisory for Hurricane Ian.

The hurricane, currently a Category 2, is forecast to strengthen before it slows down as it approaches land. It is then expected to hover off the coast of Tampa from Wednesday into Thursday before making landfall.

A hurricane watch has also been issued for Big Bend, Florida, near the panhandle, and tropical storm warnings are in effect for much of southwest Florida.

Tropical storm watches are in effect for Orlando toward the northeast portion of the state, from Fort Pierce to Jacksonville.

-ABC News' Melissa Griffin

A caravan of utility trucks is making its way from several states toward the parts of Florida most battered by Hurricane Ian to restore power after the worst of the storm has passed, Florida Gov. Ron DeSantis announced during a news conference Wednesday afternoon.

"We have a massive, massive mobilization," DeSantis said, adding that workers are coming from other southern states accustomed to hurricane cleanup, such as Texas and Louisiana.

More nearly 1.5 million customers in Florida were without power Wednesday as Ian made landfall near Fort Myers.

Ian continued to batter a large swath of Florida at 6:15 p.m. ET, with life-threatening storm surge all along the southwest coast — up to 12 feet in some places, DeSantis said.

Downtown Naples was reportedly completely flooded due to record storm surge, and while there were also reports of structural damage in Lee County, DeSantis said.

"This was a top five hurricane to ever hit the Florida peninsula," the governor said.

DeSantis said that devastating inland flooding was inundating much of the regions experiencing hurricane conditions, as well.

DeSantis has declared a major disaster in the state.

-ABC News' Will Gretsky