The threat of fire in the Angeles National Forest will be raised from "high" to "very high" on Sunday, U.S. Forest Service officials announced.
The level, which is fourth in a six-tiered danger rating system, comes as forecasters predict a heat wave starting this weekend, when temperatures move from relatively mild to triple digits, according to the National Weather Service.
Highs are expected to hover in the mid-90s through the weekend before reaching up to 104 degrees through Tuesday, according to the agency. The high temperatures, combined with the dry vegetation, prompted the raised fire danger level.
Visitors to the Angeles National Forest this weekend will be able to hike, fish and do other daytime activities that normally require a permit for free, officials announced this week.
For Aug. 14 and 15, the Daily Adventure Pass will be waived for most daytime activities, although fees for campgrounds and concessions may still be in effect, according to the U.S. Forest Service.
Officials advised visitors to check in with their local ranger station to confirm which fees remain in place for the weekend.