It was moving north around 9 miles per hour (11 kph).
Heavy rains at the weekend caused 13 deaths in Central America after Michael formed off the coast of northern Honduras.
Thank you for signing up for the Sunrise Newsletter.
A storm surge warning - meaning risky flooding could strike in the next 36 hours - is in effect for a long swath of Florida's coast, from the Okaloosa-Walton county line east of Pensacola to the Anclote River, just north of Tampa Bay.
A Tropical Storm Watch is in effect for the Suwannee River to Anna Maria Island, Florida, including Tampa Bay.
In a Facebook post Monday, the Wakulla County Sheriff's Office said no shelters would be open because Wakulla County shelters were rated safe only for hurricanes with top sustained winds below 111 miles per hour.
He's Fantastic - Fulham Boss Rows In Behind Jose Mourinho
Despite falling two goals down to Newcastle on home soil, Mourinho saw his side battle back to secure a dramatic 3-2 victory which has helped to ease some of the pressure which had been building on him.
Palestinian gunman kills 2 Israelis in West Bank
Police initially suspected that the shooting may have been a revenge attack on the man's employers, but army spokesperson Lt. He held a valid work permit and had been absent from work in the days leading up to the attack, the army said.
Nobel Economics 2018 awarded to Americans William Nordhaus and Paul Romer
It was not part of the original group of five awards set out in Swedish industrialist Alfred Nobel's 1895 will. Nordhaus' model is now widely spread and is used to simulate how the economy and the climate co-evolve.
Late Sunday, Gillum's campaign announced he scrapped campaign stops planned Monday and Tuesday in South Florida to return to Tallahassee to "focus on preparing the city of Tallahassee and residents" for the storm.
Manatee County also was included in Scott's request that President Donald Trump declare a pre-landfall emergency in those 35 counties in preparation for Hurricane Michael.
"Take this seriously and keep your family safe", Scott said from Bay County on Monday.
Florida State University announced it will close from Tuesday through Friday this week.
Scott has activated 1,250 members of the Florida National Guard, with another 4,250 on standby.
An Air Force hurricane hunter airplane was sent into the storm to investigate, the hurricane center said. The threat for excessive rainfall and flash flooding has increased to a high risk. "This is coming very fast".
Ken Graham says the storm's large size, strong winds and heavy rains could produce a lot of flooding, and the shape of this stretch of coastline makes it particularly vulnerable to storm surge.
For storm information specific to your area, please monitor products issued by your national meteorological service. Much stronger surf will fill in through Tuesday and early Wednesday as the storm approaches. One man named Richard said he lives nowhere in the areas expected to feel the brunt of Michael. The storm is moving north at about 7 miles per hour, and is expected to pick up speed over the next few days.
After the storm moves inland, it could dump additional unwanted rain on the Carolinas, which were battered by Florence in September.