I live in south Lake County, right near WDW. WDW property is actually pretty close to a point where four counties meet: Lake, Orange, Osceola, and Polk. The area where I live is referred to as Four Corners, since the four counties meet at the corners. We could smell the smoke from the Lake County fire the other day.
From Disney property, it would take you 45-60 minutes to drive to either fire: Lake fire is to the Northwest, and the Flagler County fire is East. From one of the last reports I saw, ALL Central Florida counties are under a red flag warning, basically meaning a brush fire could break out anywhere at anytime. We have had lightning last night and tonight, too.
Anyone visiting the area, please be careful with throwing lit cigarettes out of car windows. I'm not sure how the fires down here started, but when we had bad wildfires up on Long Island, that was usually the cause of it. Also, while on foot, please don't toss butts down and step on them: they don't always go out. Make sure to extinguish cigarettes or dispose of them safely (as you can at WDW smoke spots: in sand/gravel).