Rain is coming tonight and sticking around into Friday, according to the National Weather Service who provided the above graphic on their Facebook page.
They warn that multiple storm systems
… are forecast to impact Northwest California starting tonight. The majority of the rain tonight through Wednesday will fall north of Mendocino County. The most potent system of the week will move through the region on Thursday bringing widespread rain to the entire area, gusty south winds, and the possibility of hail showers beginning Thursday afternoon through early Friday morning. Additional systems will bring chances for rain this weekend into next week. Check our homepage (http://www.weather.gov/eureka) for forecast details and continue to follow us on Facebook and Twitter for more updates!