Atmospheric river conditions could bring multiple feet of snow to the northern Sierra Nevada. Other areas face a risk of flooding as the ground becomes increasingly saturated.
San Francisco could see as much as six inches of rain over the next week as a moisture-packed storm known as an atmospheric river works its way south from the Pacific Northwest.
La Niña, the cold side of the El Niño Southern Oscillation (ENSO), typically results in colder conditions across the U.S. Northern Plains and Canadian Prairies, while it remains warm across the ...