Four homes have been lost to the Flat Fire as it continues to threaten nearly 4,000 homes in Deschutes and Jefferson counties.

Firefighters battling the Oregon Flat Fire, which has so far torched nearly 22,000 acres, could face setbacks if the latest weather conditions shift, officials cautioned Monday. The raging blaze, which is only 5% contained, has destroyed homes and buildings. Thousands of families have been forced to evacuate.

The wildfire raging in Central Oregon has destroyed four houses and about half a dozen other buildings, the Deschutes County Sheriff’s Office said on social media late Sunday. The Flat fire, about 2 miles northeast of Sisters, has scorched about 22,000 acres and remains 0% contained, fire officials said.