A strong atmospheric river (AR) associated with a low-pressure system is set to impact California from Wednesday into Thursday, February 12 to 14, bringing heavy rain, mountain snow, and potential flooding. The National Weather Service (NWS) warns of significant precipitation and winter storm conditions, particularly in the Sierra Nevada and coastal mountain ranges.
A strong atmospheric river (AR) is forecast to bring heavy rainfall and colder temperatures across California this week starting Tuesday night, February 11, 2025, with the heaviest precipitation expected in southwestern parts of the state through Thursday, February 13.
At least two people have been reported dead in Sonoma County due to the storms triggered by atmospheric rivers that have been affecting the region since January 31, 2025, leading to landslides and house collapses across the region.
Two atmospheric rivers have battered the U.S. West Coast since January 31, 2025, bringing record rainfall to San Francisco and triggering landslides and flooding across California. At least one person was hospitalized.
A long-duration atmospheric river (AR) continues to impact Northern California, bringing heavy precipitation, with two additional moisture pulses expected before it dissipates on Wednesday, February 5, 2025.
A strong atmospheric river (AR) is set to bring heavy rainfall to northern California starting Sunday, February 2, 2025, with forecasts indicating up to 380 mm (15 inches) in the Sierra Nevada, increasing the risk of flash floods and debris flows near the burn scars.
An extended period of landfalling atmospheric river (AR) activity will bring heavy precipitation to Northern and Central California starting January 31, 2025, and continuing into the following week. The event is expected to cause significant hydrologic impacts, with heavy rain, high-elevation snow, and potential flooding.
Toxic waste from burned lithium batteries, asbestos, and synthetic materials poses a significant risk in California’s wildfire-affected areas. Cleanup efforts are being delayed as hazardous substances require specialized removal before residents can safely return.
Forecast confidence in a high-impact atmospheric river (AR) event has steadily increased since January 27, 2025, and CW3E is now warning about a major AR event expected to begin this Friday, January 31 along the U.S. West Coast, and potentially continue into early next week. The most recent forecast from the NCEP Global Ensemble Forecast System (GEFS) is showing >50% probability of an AR 4 or greater over along the California coast between Santa Cruz and Mendocino Counties.
Two atmospheric rivers (ARs) are forecast to bring significant rain to the U.S. West Coast on January 30 and 31, 2025, with the potential for heavy precipitation as a second AR overtakes the first and stalls into early next week.
