LEHIGH TWP., Pa. - Crews have been battling brush fires across our region since Friday. In Northampton County, first responders have been working to contain a massive blaze on Blue Mountain since Saturday.

"We pretty much have the perfect conditions," Assistant Chief Brian Krische, with the Lehigh Township Volunteer Fire Company, said.

Crews say all the brush fires are a result of humidity level, wind directions and this dry, rainless past month.

"It's been a 1, 2, 3," Krische said.

On Friday, Krische and crews rushed from a brush fire in Moore Township to another one in Lehigh Township, before getting the call Saturday to rush to the current one, just a few miles away, on Blue Mountain.

This latest fire, also in Lehigh Township, spread to about 180 acres by Monday morning -- about 30 more since Sunday night.

"Today's the day to get a lot of good work done again," Bob Kurilla, a public information officer with Pennsylvania Department of Conservation and Natural Resources, said. "The weather's going to get warmer and drier and breezier as the week goes on."

Helicopters could be seen amid all the smoke coming off the mountain, dumping water from the nearby river.

"We haven't had rain in over a month," Kurilla said. "So fields are dried out, old leaves come down now, the sunlight's beating directly onto the forest floor. It's brushy up there, it's steep, it's rocky, it's not easy to put a containment line in."

So far, officials have the fire about 28 percent contained, according to DCNR, as responders work on a controlled burn to keep the fire from spreading to houses on Timberline Road.

"We lit a backfire to feed into the main fire, and the fire is basically just rolling down the hill, rolling down the mountain very softly," Krische said.

Timberline Road is closed for through traffic, in order to keep it open for emergency vehicles.

The fire hit a part of the Appalachian trail running across the top of the mountain. National Parks says it closed that portion off to the public, as crews fought the fire on the north and northeast.

Officials don't know the exact cause yet, though they are chalking it up to the weather conditions. And they say they have a general area of where to investigate.

"Because a lot of passerbys have sent us pictures of when the fire started," Krische said.

Krische adds, crews will likely continue working on containing this brush fire for the next few days. But responders have it contained enough that no homes have been hit on Timberline Road, which is at the base of the mountain.

And even with hundreds of personnel over the last few days fighting the fire, there are still no injuries.