Wildfires burn in California, Montana and Idaho as firefighters contend with scorching heat

Wildfires in California, Montana and Idaho exploded in size overnight amid windy, hot conditions and were quickly encroaching on neighborhoods Saturday.

In Northern California's Klamath National Forest, the fast-moving McKinney fire had burned an estimated 30,000 to 40,000 acres with zero containment by Saturday afternoon, according to the U.S. Forest Service. The fire started Friday in a largely rural area near the Oregon state line. Videos posted to social media showed a massive plume of smoke billowing hundreds of feet into the air. 

More than 100 homes were evacuated and authorities were warning people to be on high alert.