* WHAT...Flooding caused by excessive rainfall is possible. * WHERE...A portion of northwest California, including the following areas, Mendocino Coast, Northeastern Mendocino Interior, Northern Lake, Northwestern Mendocino Interior, Southeastern Mendocino Interior, Southern Lake and Southwestern Mendocino Interior. * WHEN...From Saturday afternoon through Monday afternoon. * IMPACTS...There will be an increased risk of rock and land slides along roadways. Excessive runoff may result in flooding of creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - An atmospheric river will move into Mendocino and Lake Counties starting Saturday afternoon and continue into Monday. Periods of moderate to heavy rain with rates of a quarter to a half inch are possible. Total rain amounts of 3-6 inches are forecast. Rises in creeks and streams are likely and could result in minor flooding impacts. Flooding may occur in poor drainage and urban areas. - http://www.weather.gov/safety/flood