JACKSONVILLE, Fla. — Stressed and exhausted families across the Southeast were assessing the damage from Hurricane Irma on Tuesday, even as flooding from the storm continued to plague some areas, like Jacksonville, and the worst of its wallop was being revealed in others, like the Florida Keys.

Officials in Florida, Georgia and South Carolina tried to prepare residents for the hardships of recovery from the storm. Almost 4.4 million Florida homes and businesses remained without power on Tuesday evening, according to state officials, and there were widespread electricity problems in other states as well. At least 56 people have died as a result of the storm, including at least 13 in Florida, according to The Associated Press.

Weakened now to a post-tropical cyclone, Irma moved toward the Ohio Valley and spread its clouds and rain over a vast area, while blue skies and sticky heat returned to Florida. The White House announced that President Trump, who twice visited Texas after Hurricane Harvey, will visit Florida on Thursday.

Nursing homes and assisted-living facilities in areas without power struggled to keep residents cool and vital medical equipment operating with backup generators.