* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of northern California, including the following areas, the Sacramento Valley, northern San Joaquin Valley, Delta region, Sierra Nevada and adjacent foothills, and Coastal Range. * WHEN...Through Friday afternoon. * IMPACTS...Excessive runoff will result in rises along area rivers, creeks, streams. Small streams and creeks may rise out of their banks. Flooding may occur in low-lying, poor drainage, and urban areas. Mudslides and rockslides may occur in mountain and foothill areas. * ADDITIONAL DETAILS... - Periods of moderate to heavy rain are forecast the week of Christmas. Debris flows are not expected over recent burn scars in northern California, but do anticipate enhanced runoff in/below scars. - http://www.weather.gov/safety/flood

* WHAT...South winds 25 to 35 mph with gusts up to 60 mph possible. * WHERE...Carquinez Strait and Delta, Sacramento Valley, Motherlode, Northeast Foothills, and Northern San Joaquin Valley. * WHEN...From Tuesday afternoon through Friday afternoon. * IMPACTS...Strong winds and saturated soils could blow down trees and power lines resulting in widespread power outages. Strong winds may cause impacts to unsecured items, including temporary structures and holiday decorations. Travel could be difficult, especially for high profile vehicles. * ADDITIONAL DETAILS...Strongest wind gusts expected in the northern Sacramento Valley and adjacent foothills on Wednesday.

* WHAT...Heavy snow expected. Accumulations up to a foot between 4500 to 5500 feet. 4 to 8 feet, with locally higher amounts above 5500 feet. Wind gusts up to 60 mph. * WHERE...West Slope Northern Sierra Nevada and Western Plumas County/Lassen Park Counties. * WHEN...From 10 PM Tuesday to 10 PM PST Friday. * IMPACTS...Dangerous travel conditions with chain controls and road closures. Localized tree damage, power outages, and low visibility due to the combination of heavy wet snow and strong winds. * ADDITIONAL DETAILS...Snow accumulations will remain near or above pass level through Tuesday, then drop to around 4500 to 5500 feet during the day Wednesday through Friday. Snowfall rates of 1 to 2 inches per hour at times.