If he does order an evacuation, lanes on Interstate 26 and other evacuation routes would be reversed starting at 10 a.m. Saturday. That includes the city of Savannah.
Florida isn't the only state preparing for Hurricane Irma.
Trump's order allows for the federal government "to supplement State, tribal, and local response efforts due to the emergency conditions resulting from Hurricane Irma beginning on September 6, 2017" and continuing thereafter.
North Carolina is still several days away from feeling the effects of Irma, but could begin to feel wind from the storm Sunday and see rough surf and beach erosion as early as today.
Dennis Jones is emergency management director for Chatham County, coastal Georgia's most populous county.
The Savannah College of Art and Design would postpone the start of its school year, according to AJC.com.
Gov. Ray Cooper declared a state of emergency Wednesday afternoon.
"It is not too soon to get ready", Cooper said.
McMaster signed a second executive order Thursday demanding owners of 2,370 dams release water to accommodate the heavy rain forecast with Hurricane Irma and allowing state regulators to lower water levels dams where owners failed to follow the order.
"We would likely feel the effects in the Monday, Tuesday time frame, but I can not stress enough the amount of uncertainty", meteorologist Scott Sharp said.