CALIFORNIA SNOW REPORT

* WHAT...Heavy snow possible. Total snow accumulations of 3 to 5 feet possible. Winds could gust as high as 50 mph. * WHERE...Sierra Nevada south of Yosemite to Lake Isabella area. * WHEN...From Tuesday afternoon through Friday afternoon. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Travel could be very difficult to impossible. The hazardous conditions could impact the Tuesday evening and Wednesday morning commutes. Gusty winds could bring down tree branches.

* WHAT...Heavy snow possible. Total snow accumulations of 6 to 8 feet. Winds could gust as high as 50 mph. * WHERE...Yosemite NP outside of the valley. * WHEN...From Saturday afternoon through Friday afternoon. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Travel could be very difficult to impossible. The hazardous conditions could impact the Monday morning and evening commutes. Gusty winds could bring down tree branches.

* WHAT...Flooding caused by excessive rainfall is possible. * WHERE...Northern San Francisco Bay Area (Napa, Sonoma, and Marin counties). * WHEN...From Saturday afternoon through Monday afternoon. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Low water crossing may become flooded. Standing water is likely in urban areas. * ADDITIONAL DETAILS... - Moderate to heavy rain associated with an atmospheric river will impact the region this weekend. 2-3" of rain is expected in the valleys during the watch period, with up to 6" in the coastal mountains. Area rivers, streams, and creeks that are prone to flooding could see rapid rises during and after heavy rainfall. There is a slight chance for flash flooding, particularly in urban areas Saturday night. Debris flows are possible. - http://www.weather.gov/safety/flood

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of central California, including the following areas, Mariposa-Madera Lower Sierra, San Joaquin River Canyon, Upper San Joaquin River, Yosemite NP outside of the valley and Yosemite Valley. * WHEN...From Saturday afternoon through Friday afternoon. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Low-water crossings may be flooded. * ADDITIONAL DETAILS... - http://www.weather.gov/safety/flood

* WHAT...Flooding caused by excessive rainfall is possible. * WHERE...Much of Central California. * WHEN...From Tuesday afternoon through Friday afternoon. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. Low-water crossings may be flooded. * ADDITIONAL DETAILS... - http://www.weather.gov/safety/flood

* WHAT...Flooding caused by excessive rainfall continues to be 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

A series of warm atmospheric rivers will bring moderate to heavy rain to the Valley, foothills, and mountains the week of Christmas. The prolonged period of rain will bring the risk of flooding to the Sacramento Valley, northern San Joaquin Valley, northern Sierra Nevada and adjacent foothills, as well as the Coastal Range. * WHAT...Flooding caused by excessive rainfall is 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...From Saturday afternoon through next 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, but do anticipate enhanced runoff in/below scars. - http://www.weather.gov/safety/flood