A potent storm system is set to impact Northern California this week, with heavy rain and strong winds expected. A cold front will bring light to moderate rainfall this afternoon, but the real impact will be felt starting Tuesday, when southerly winds will increase and an atmospheric river targets the region. From Wednesday through Friday, up to 4 inches of rain could fall in Del Norte, Humboldt, and northern Mendocino counties, leading to flooding concerns. Strong winds, gusting up to 70 mph, are forecast for coastal areas. Additionally, heavy snow is likely in northeastern Trinity County, especially near Trinity Lake, with up to a foot of snow possible in some areas, affecting travel.