A National Oceanic and Atmospheric Administration station in Venice Beach, Florida, has measured wind gusts of 104 mph within the northern eye wall of Hurricane Ian, according to the 6 p.m. storm advisory.

The storm is currently battering the Florida peninsula with catastrophic storm surge, winds and flooding, according to the National Hurricane Center.

Maximum sustained winds measured at 130 mph, and the storm system has begun churning even slower at 8 mph north-northeast -- toward the east coast of the state.

-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

The city of Fort Myers in southwest Florida has issued a citywide curfew "to protect and safeguard the health, safety and welfare of residents, visitors and first responders." The curfew started at 6 p.m. Wednesday and will be in effect for the next 48 hours.

Down the coast, the city of Naples also issued a citywide curfew earlier Wednesday afternoon, effective immediately until further notice.

Naples reported record storm surge Wednesday morning, before Ian made landfall.

Hurricane Ian made a second landfall just south of Punta Gorda with maximum sustained winds of 145 mph.

Ian made initial landfall on a barrier island near Cayo Costa just after 3 p.m.

Lee County has received more than double the number of 911 calls it typically receives amid Hurricane Ian, according to Sheriff Carmine Marceno, as first responders have suspended their emergency response during the major storm.

"We hear your calls and are aware that Hurricane Ian was a powerful and devastating weather event," Marceno said in a social media post Wednesday evening. "We want to get to you. We want to save you. As soon as safely possible, our assets are ready to deploy to come to your aide."

Ben Abes, Lee County's public safety director, said current conditions, including flooding, make it "impossible" for first responders to go out. He said the county is tracking 911 calls and prioritizing them once first responders are able to act after the hurricane passes.

"We are aware of a number of calls of people who are stranded due to high water," he said during a press briefing Wednesday evening. "This is a scary situation. We urge you not to panic."

Lee County, which is home to hard-hit Fort Myers, Sanibel and Bonita Beach, issued a countywide curfew Wednesday evening due to the storm that is in effect until further notice.