National Weather Service United States Department of Commerce

Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

 Click on SnoTel site on map above or on left menu to display individual site's graph in frame below

Click on a river basin on the map below or on left menu
to display basin-wide snowpack projection graphs in the frame above

(User's Guide for the Interpretation of the Basinwide Snowpack Projection Graphs .pdf file)