A very dry air mass will warm on Friday and Saturday as weak Santa Ana conditions develop. Onshore flow
returns Saturday night and Sunday morning with areas of coastal clouds and fog. Another Santa Ana wind
develops Monday morning and continues to Wednesday morning. This will bring stronger winds to the canyons,
passes and Inland Empire but not as hot. A return to very warm temperatures for Wednesday. Sea breezes
will be very weak on the coast due to offshore flow, except for moderate onshore flow Sunday and Sunday
Weather Threats and Impacts:
Very warm temperatures Friday and Saturday. Extremely low humidity and gusty Santa Ana winds across mountains
and foothills. Elevated fire weather danger. Stronger Santa Ana wind and low humidity Monday and Tuesday, not
as hot but becoming very warm by Wednesday.
- Fire weather impacts possible
- Offshore flow northeast winds developing Friday morning. Gusts 20-30 mph portions of Inland Empire and in mountain passes and canyons, and foothills. Local gusts to 45 mph. Onshore winds Saturday night through Sunday evening.
- Offshore flow northeast winds developing Monday morning and continuing through Wednesday morning. Gusts 25-35 mph for Inland Empire, foothills, mountain passes and canyons. Local gusts over 55 mph.
Forecast Relative Humidity:
- Extreme low humidity Friday and Saturday. Very low humidity Monday to Wednesday. Good recovery and higher humidity Sunday and Sunday night. Nighttime humidity recovery on the immediate coast each night.
- Event 1: Friday and Saturday for heat and weak Santa Ana wind
- Event 2: Monday to Wednesday morning for stronger Santa Ana wind.
Locations Impacted: Highway 91 corridor and pass, I-15 and I-215 Cajon Pass, I-10 San Gorgonio Pass, I-8 pass
All areas for heat and low humidity, mountain passes and canyons for wind.