Wildfires burning across the south-eastern US intensified on Wednesday across parts of south-east Georgia, where 50 homes were destroyed, and across north-east Florida, forcing evacuations and school closures in some communities.

The Georgia forestry commission issued its first mandatory burn ban in the state’s history, effective across 91 counties in the lower half of the state, due to worsening drought conditions and rising wildfire activity.

“My office and I are working closely with the Georgia Forestry Commission to respond to the increasing threat of wildfires in South Georgia,” Governor Brian Kemp wrote on X. ”If you are in a directly affected area, please adhere to guidance from your local officials to keep you and your family safe.”

Smoke from the fires drifted to Atlanta and Savannah, Georgia, as well as Jacksonville, Florida, while air quality in parts of south Georgia declined to the unhealthy category.

Smoky conditions were expected to linger in the Atlanta area throughout the day, according to the Atlanta-Fulton county emergency management agency, as the worst blazes burned more than 200 miles from the city.

Some of the biggest blazes are reported to be along Georgia’s coast and around Jacksonville, Florida. They have been exacerbated by a long drought, low humidity and strong winds in the area.

Georgia’s two biggest wildfires together have burned more than 31 sq miles, and at least four other smaller fires have been reported.

Drought in the contiguous US has reached record levels for this time of year. More than 61% of the lower 48 states are in moderate to exceptional drought – including 97% of the south-east and two-thirds of the west – according to the US Drought Monitor. It’s the highest level of drought for this time of year since the drought monitor began in 2000.

Florida, the area where the worst fires are burning, is in exceptional or extreme drought, according to the monitor. Firefighters are battling 131 wildfires that had burned 34 sq miles, mostly in the state’s northern half.

Firefighting equipment was being staged across the state so resources are closer to the fires, the Florida commissioner of agriculture, Wilton Simpson, said.

“Florida has got one of the worst fire seasons in maybe the last 30 or 40 years or it’s turning out to be that way,” Simpson said. “We’ve been in drought for 18 months now all across the state.”

The fast-moving Brantley county fire in south-east Georgia is threatening more homes on Wednesday after destroying 47 a day earlier, according to the county manager, Joey Cason, who said the fire grew roughly six times in size over a half day. Nearly two dozen fire agencies called in to help fight the blaze, Cason said at a news conference. At least 800 evacuations have taken place in the county and five shelters have opened, as the fire threatens 300 more homes, the Federal Emergency Management Agency said.

The Brantley county sheriff, Len Davis, warned residents to be ready to evacuate, noting that the winds could shift rapidly and unexpectedly.

Another large fire that started in Clinch county had also forced evacuations, which were underway in multiple communities, the Georgia forestry association said.

“This is a serious and evolving situation,” said Tim Lowrimore, president & CEO of the association.