The Florida Forest Service is urging Floridians to exercise caution because of a significantly heightened wildfire risk throughout the state.

Most of the southern half of Florida is either in the "very high" or "extreme" category. Polk County was added to the "extreme" category on Thursday.

The fire danger is also considered "extreme" in Orange, Brevard and Indian River counties.

Burn bans have been put in place for Osceola and Seminole counties. Orange and Hillsborough counties have a year-round burn ban, though Orange issued an emergency burn ban earlier this week.

Officials said the Florida Forest Service has battled more than 700 wildfires across the state so far this year, and drought conditions are expected to continue.

There are more than 40 active wildfires throughout Florida, most of which have been caused by escaped yard trash burns, officials say.

“Many wildfires this year have unfortunately been human-caused,” said Jim Karels, a forestry official. “It’s imperative that Floridians are cautious with fire to help protect Florida’s residents, natural resources, and wildland firefighters.”