As the Category 4 storm's center crossed nearby, Mulligan said, her concrete complex shook and vibrated against sustained winds of around 155 miles per hour.
All told, more than 900,000 homes and businesses in Florida, Alabama, Georgia and the Carolinas were without power.
Scientists say global warming is responsible for more intense and more frequent extreme weather, such as storms, droughts, floods and fires, and Michael was fueled by abnormal water temperatures in the Gulf - 4-to-5 degrees above the historic norm for this time of year.
"Tropical storm wind gusts will continue across much of SC and central and eastern North Carolina, with sustained tropical storm force winds expected along the coast of the Carolinas", the agency said.
The Carolinas are still recovering from Hurricane Florence, which left dozens dead and is estimated to have caused billions of dollars in damage last month.
Speaking later to reporters, Trump said the hurricane was "incredibly powerful".
According to forecasts, "Michael" will sweep in from Florida to Maryland.
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The fate of about 280 residents who authorities said ignored evacuation orders was unknown.
At the Tyndall Air Force Base, about 15 miles northwest of Mexico Beach, the monster storm pushed over trucks and peeled back the roof of a massive airplane hangar. Downed power lines lay almost everywhere. The storm has killed a man in Florida and a girl in Georgia.
Two people have reportedly died due to the hurricane.
Almost 300 people were known to have ignored a mandatory evacuation order to leave Mexico Beach before the storm.
Her brother, she said, lost a condo along the beach, and the other nearby units were also destroyed.
"The storm surge is absolutely deadly". But "we have to make sure things are safe".
Federal Emergency Management Agency chief Brock Long said he expects to see the death toll rise.
But Michael's quick progress means it won't have a chance to trigger the same widespread, epic flooding as past slow-moving hurricanes such as Florence and Harvey, which unleashed seemingly endless rains after stalling and hovering inland. But instead, Michael will be remembered as one of the most damaging and powerful storms to ever hit the continental United States, reports The Atlantic.
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The Florida Highway Patrol has closed an 80-mile stretch of Interstate 10 to clear debris from Hurricane Michael.
Florida Gov. Rick Scott said Friday morning that the state has "half a million gallons of fuel being distributed daily at 40 fueling stations to support our utility crews as they work around the clock to restore power".
The Pentagon positioned more than 2,200 active-duty military personnel, along with helicopters, high-water vehicles and swift-water boats.
The hurricane hit the Florida Panhandle as a category 4 storm.
It will take some time for residents of north Florida to take stock of the enormity of the disaster.
This article was originally published at 7:24 a.m. A Category 5 storm is defined by 157 miles per hour or greater winds. All vessels greater than 500 gross tons without permission to remain in port, should have departed or should be prepared to depart prior to the setting of port condition Zulu.
Gulf Coast Regional Medical Center treated some people but the hospital evacuated 130 patients as it was dealing with its own hurricane effects. These ports and facilities are now open to all commercial traffic and all transfer operations may continue while X-ray remains in effect.
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Boothroyd said: "Because of the injuries the team has got it just gives them an opportunity". We try to work in the same way and the benefits from that are clear.