(CNN) — Hurricane Ian made landfall along the southwestern coast of Florida near Cayo Costa around 3:05 p.m. ET Wednesday with winds near 150 mph, making it a strong Category 4 hurricane, according to the National Hurricane Center.

The storm is delivering a catastrophic trifecta of high winds, heavy rain and historic storm surge to the state and is set to cause significant power outages and flooding as it moves at a slow pace across central Florida over the next day or two.

Hurricane Ian is tied for the strongest storm to make landfall on the west coast of the Florida peninsula, matching the wind speed of Hurricane Charley in 2004. Already, over 800,000 Florida utility customers were without power as of 3:45 p.m., according to PowerOutage.us, and officials in Cape Coral and Punta Gorda reported significant impacts.

Much of west-central Florida and places inland face disaster: “Historic” storm surge up to 18 feet is possible and could swallow coastal homes; rain could cause flooding across much of the state; and crushing winds could flatten homes and stop electricity service for days or weeks.

“This is a wind storm and a surge storm and a flood storm, all in one,” CNN meteorologist Chad Myers said. “And this is going to spread itself out across the entire state. Everybody is going to see something from this.”

Fort Myers Beach was already feeling the brunt of the storm’s powerful eyewall just after noon Wednesday. Frank Loni, an architect from California staying in the community, posted video from a building’s balcony of some of the flooding on the streets below.

“The storm surge is very significant. We’re seeing cars and boats float down the street. We’re seeing trees nearly bent in half,” Loni said. “There’s quite a bit of chaos on the streets.”

FOLLOW LIVE UPDATES

Mandatory evacuations have been ordered for flood-prone areas on the coast, and the National Weather Service warned those who stayed behind to move to upper floors in case of rising water levels.

“This is a powerful storm that should be treated like you would treat” a tornado approaching your home, Gov. Ron DeSantis said around 8 a.m.

Images showed extensive flooding in coastal neighborhoods in Naples, where officials asked residents to shelter in place until further notice.

In some areas, such as Charlotte County, Florida, 911 response teams have stopped emergency service due to the high winds and dangerous conditions. Sarasota Mayor Eric Arroyo said on CNN’s “At This Hour” that police officers were being taken off the streets due to the wind speeds and hazardous conditions.

“It is too late to evacuate at this point,” Arroyo said.

Ian poses several major dangers:

• Storm surge: Some 12 to 18 feet of seawater pushed onto land was predicted Wednesday for the coastal Fort Myers area, from Englewood to Bonita Beach, forecasters said. Only slightly less is forecast for a stretch from Bonita Beach down to near the Everglades (8 to 12 feet), and from near Bradenton to Englewood (6 to 10 feet), forecasters said.

Lower — but still life-threatening — surge is possible elsewhere, including north of Tampa and along Florida’s northeast coast near Jacksonville.

• Winds: Southwest Florida is facing “catastrophic wind damage.” Winds near the core of Hurricane Ian could exceed 150 mph, with gusts up to 190 mph, the hurricane center said. Multiple locations, including Sanibel Island, already have recorded wind gusts above 100 mph.

Ian is expected to retain hurricane strength for some time as it crosses the peninsula, with hurricane warnings issued for not only southwest Florida but also much of central Florida from coast to coast.

• Flooding rain: Because the storm is expected to slow down, 12 to 24 inches of rain could fall in central and northeastern Florida — including Tampa, Orlando and Jacksonville. That makes for a top-of-scale risk for flooding rainfall across this area.

Where the hurricane is headed

Prior to nearing Florida, Hurricane Ian pummeled Cuba on Tuesday, leaving at least two dead and an islandwide blackout.

Since then, residents of Florida’s vulnerable Gulf Coast have been boarding up and leaving in droves on congested highways. More than 2.5 million people were advised to flee, including 1.75 million under mandatory evacuation orders — no small ask in a state with a large elderly population, some of whom have to be moved from long-term care centers.

Storm surge already was rising late Wednesday morning — more than 4.5 feet above normal highest tides was recorded before noon in Naples, already higher than the previous record there of 4.02 feet from Hurricane Irma in 2017.

After making landfall, Ian’s center is expected to move over central Florida through Thursday morning. Heavy rain and flooding also is possible in southern Florida, Georgia and coastal South Carolina.

Because Ian slowly approached land, the worst conditions could remain over some areas for eight or more hours.

“Widespread, life-threatening catastrophic flash, urban, and river flooding is expected” across central and southern Florida, the hurricane center said.

By late Thursday, Ian is due to emerge over the Atlantic Ocean, where it could strengthen again and affect another part of the US.

Parts of far southern Florida by early Wednesday morning had begun feeling the storm’s effects, with tropical storm-force winds and at least two possible tornadoes reported in Broward County, including at North Perry Airport, where planes and hangers were damaged. Major flooding was being reported in Key West due to storm surge, along with power outages.

Schools, supermarkets, theme parks, hospitals and airports had announced closures. The Navy moved its ships, and the Coast Guard has shut down ports. As winds pick up, gas stations may temporarily run out of fuel, DeSantis said.

Life upended as Floridians prepare for landfall

In Tampa, police went door to door Tuesday in a mandatory evacuation zone, making sure residents were ready to flee. Earlier projections had Ian on track to slam Tampa Bay, and even as the hurricane’s path shifted south, mandatory evacuations and preparations continued, Tampa Mayor Jane Castor said.

Law enforcement officials around the state warned that people who stayed behind in evacuation areas cannot expect rescuers to respond to calls for help during the storm when winds are high.

“If you call for help, once we pull (officers) off the road … we’re not coming. … We’re not putting people in peril when (others) didn’t heed the mandatory evacuation order,” Pinellas County Sheriff Bob Gualtieri said Wednesday.

Not everyone moved. Chelsye Napier, of Fort Myers, stayed home with her fiance and cats despite being in an evacuation zone, she told CNN Wednesday. They waited “because we don’t know anyone down here,” and ultimately decided to stay put, she said.

“If anything happens, we have everything that we need here. We’ve got food, we got water. We have everything that we need here,” she said. “So it’s all OK for right now. We’ll see, though, later on.”

Preparations across Florida have been underway for days as residents braced for Ian’s wrath. People lined up to pick up sandbags and flocked to stores to stock up on supplies like water and batteries.

And as the hurricane marched closer, the closures began.

Across Florida, 58 school districts have announced closures due to storm as campuses turned into shelters for evacuees. Disney World is set to close Wednesday and Thursday, as is Kennedy Space Center’s Visitor Complex. And hundreds of Publix grocery stores shut their doors Tuesday evening, expected to remain closed through Thursday.

As millions were told evacuate, 176 shelters opened statewide and hotels and Airbnbs opened to people leaving evacuation zones, DeSantis said.

Local governments and state agencies also prepared those living in nursing homes and other senior care facilities to evacuate.

Florida has around 6 million residents over the age of 60, according to the state’s Department of Elder Affairs — nearly 30% of its total population. As of Tuesday, all adult day cares, senior community cafes and transportation services in evacuation zones are closed, according to the department.

Authorities also readied services to fan out and respond to calls for rescue and then, in the aftermath of the hurricane, for recovery and repair efforts.

Nearly 400 ambulances, buses and support vehicles were responding to areas where the hurricane was expected to make landfall, according to the governor’s office.

DeSantis activated 5,000 Florida National Guard members for Ian’s response operations, and 2,000 more guardsmen from Tennessee, Georgia and North Carolina were being activated to assist.

Florida urban search and rescue teams also were prepping.

“We have five state teams that are activated with additional five FEMA teams that are in play,” Florida Chief Financial Officer Jimmy Patronis said at a news conference Tuesday night. “We have over 600 resources to bear in addition to these out-of-town teams.”

(Copyright (c) 2022 CNN. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)

Join our Newsletter for the latest news right to your inbox