Map: Apple Fire perimeter and evacuation near Banning

As of 10 a.m. Sunday, the burned area was estimated at 20,516 acres (32 square miles), the National Forest report said.

The Apple Fire has burned more than 20,000 acres and forced evacuations in Riverside and San Bernardino counties.

The wildfire started around 5 p.m. Friday along Oak Glen Road near the community of Cherry Valley. The cause is under investigation, said the report from the San Bernardino National Forest.

In addition to the residential evacuations (shown in orange on the map above), there were closure orders for the San Gorgonio Wilderness — roughly bounded by Highway 38 on the west and north — and a section of the Pacific Crest Trail.

The red perimeter on the map above reflects data from a mapping flight late Saturday. Intense heat and smoke prevented mapping of the northern edge; the black area shows the likely burn area as indicated by hot spots on satellite imagery.

At 10 a.m. Sunday, the burned area was estimated at 20,516 acres (32 square miles), the National Forest report said.

At that time, heavy smoke from the fire had reached Las Vegas and much of Arizona.