Officials say it’s one of the most powerful storms ever recorded in the U.S.

Hurricane Ian has made landfall in southwest Florida with winds of 155 mph. Hitting the mainland U.S. as a Category 4 storm— officials say it’s one of the most powerful storms ever recorded in the nation.

Moving at a crawling pace— Hurricane Ian is prompting major concerns about flooding and delayed rescues for those who decided to ride out the storm.

Forecasters say the storm’s relatively slow surge could lead to even greater rainfall than expected.

After slamming Florida’s southwest coast with Category 4 force Wednesday afternoon, Florida Gov. Ron DeSantis told residents that Ian brought powerful conditions including relentless rainfall and life-threatening winds that are “incredibly dangerous.”

He said, “there will be debris in the air and flooding powerful enough to move cars around so please do not be outside during the storm. If you’re in those Southwest Florida counties that you need to be sheltering in place. Don’t forget that Ian will produce hurricane strength winds and massive flooding—not just where it makes the initial landfall—but throughout the state of Florida so central Northeast Florida will also feel impacts.”

The entire Sunshine state is under a state of emergency.

Several airports in Florida are closed with thousands of flights cancelled.

More than 50 of the state’s 76 school districts have already canceled classes, with many public schools be turned into evacuation shelters.

Meanwhile, FEMA has already deployed 700 personnel to Florida and the governor has activated 5,000 state national guard with another 2,000-guard coming in from other states.