NAHUNTA, Ga. (AP) — Wildfires burning across the southeastern U.S. were intensifying Wednesday after destroying nearly 50 homes in Georgia and forcing evacuations and school closures in some communities.

Some of the biggest blazes were along Georgia’s coast and between and around Jacksonville, Florida, a state that is facing one of its worst fire seasons in decades. It was not yet clear how the wildfires started, but a prolonged drought, low humidity, and strong winds were fueling them.

Georgia’s two biggest wildfires together have burned more than 31 square miles (80 square kilometers), with at least four other smaller fires reported across the state. The area is categorized under exceptional or extreme drought according to the U.S. Drought Monitor.

In southeast Georgia, the fast-moving Brantley County fire was threatening more homes after destroying 47 a day earlier. The fire grew in size significantly in just half a day on Tuesday, prompting swift responses from nearly two dozen fire agencies.

Brantley County Sheriff Len Davis warned residents to be ready to evacuate, as winds could swiftly shift. At least 800 evacuations have taken place in the county, with five shelters opened for displaced residents as the fire threatens an additional 300 homes, per reports from the Federal Emergency Management Agency.

Another major fire in Clinch County has also led to evacuations in multiple communities. Tim Lowrimore, president of the Georgia Forestry Association, emphasized the seriousness of the current situation as it continues to evolve.

Across Florida, firefighters battled 131 wildfires burning a total of 34 square miles (88 square kilometers), primarily in the northern part of the state. Firefighting resources are being strategically placed closer to ongoing fires, as Florida faces one of its worst fire seasons in 30 to 40 years due to the ongoing drought.

The National Weather Service has cautioned residents about elevated fire danger due to low humidity and breezy conditions, which could persist into the weekend. Smoke from the fires has traveled as far as Atlanta, Savannah, and Jacksonville, degrading air quality in parts of southern Georgia to unhealthy levels.

As of now, conditions remain tense with firefighters working diligently to control these fast-spreading blazes.