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.

Caribbean islands such as Jamaica and Grand Cayman will start to experience the effects from the outer bands of Tropical Storm Ian within the next 24 hours, forecasts show. The islands will experience conditions such as heavy rain, possible flash flooding and storm surge.

The storm system will begin to rapidly intensify overnight into Monday before it closes in on western Cuba on Monday night.

As of 2 p.m., the sustained winds in the tropical storm remained at 50 mph as it moved west-northwest at 12 mph, the center about 265 miles away from Grand Cayman.

Hurricane warnings are in effect for Grand Cayman and western Cuba, while tropical storm warnings and watches are in effect in other portions of both islands.

As a hurricane, Ian is expected to peak at a Category 4 before weakening slightly as it looks to make landfall on the west coast or panhandle of Florida in the coming days.

There is still some uncertainty to the track Ian will take once the system enters the Gulf of Mexico.

The center of the storm and the worst of the impacts could end up heading toward the western coast of Florida's peninsula, including the Tampa area. The other possible scenario has the storm moving more due north and bringing a possible landfall along the Florida peninsula, impacting cities like Panama City and Tallahassee with more direct effects.

The storm will begin to impact the Florida keys and the southern portions of the state by Tuesday night.

-ABC News' Dan Peck