Changes Since Last Briefing:
Moderate to Strong Santa Ana winds will bring very dry and windy weather to the region late Sunday night (10/8) through early Tuesday (10/10). Critical fire weather conditions are likely for portions of the coastal foothills/valleys/passes.
Weather Threats, Impacts and Locations:
- Critical fire weather conditions due to low humidity, dry fuels and strong and gusty winds:
- San Bernardino, Riverside and San Diego County mountains, foothills and passes (including I-15 and I-215 Cajon Pass, I-10 San Gorgonio Pass, I-8 Pass).
- Santa Ana Mountains/Foothills and inland Orange County (including Highway 91 corridor and pass).
- Strong winds resulting in hazardous cross-winds for high profile vehicles. Broken tree limbs and debris on the roadways.
- Chance of power outages.
- Areas of northeast winds 25-35 mph with gusts to 55 mph.
Forecast Relative Humidity:
- Humidity falling to 5-10 percent with poor recovery for the mountains and far inland valleys Monday night, then falling to 8-12 percent Tuesday.
- Moderate to Strong winds late Sunday night through late Monday morning (with strongest winds during the early to mid morning hours Monday), then winds weak to moderate strength Monday afternoon through late Monday night, becoming mainly weak Tuesday morning.
Winds will turn back onshore late Tuesday and humidity recovery Tuesday night will be better, with humidities continuing to increase Wednesday and Thursday.