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.

Ian remains a tropical storm with winds of 50 mph, but the storm system is expected to rapidly intensify on Sunday as it moves over warm waters in the Caribbean Sea, according to the National Hurricane Center.

The seawater currently carries very favorable conditions for strengthening over the coming days, with temperatures between 85 and 90 degrees Fahrenheit -- the perfect temperatures for fueling a powerful storm as it stays over open water.

Ian is expected to strengthen to a hurricane by Sunday night and into a major hurricane later Monday night as it passes by Cuba.

The NHC currently forecasts Ian to strengthen into a major Category 4 hurricane on Tuesday in the Gulf of Mexico as it heads toward Florida.

Ian is expected to make landfall on the west coast or the panhandle of Florida on Wednesday or Thursday.

Some weakening could occur before the storm system makes landfall, possibly dipping below major hurricane status before impacting coastal communities.

A hurricane warning is currently in effect for the western portion of Cuba, where flooding rains and major storm surge are forecast.

-ABC News' Riley Winch