Three tornadoes hit central California in third such day since 1955
At least three tornadoes touched down in California on April 21 between 14:10 and 17:15 local time (LT).…
Heavy mountain snow and strong winds forecast across Sierra Nevada, California
A Pacific weather system associated with an upper-level low is forecast to bring heavy snow and strong winds…
Coastal storm and long-duration atmospheric river to bring heavy precipitation to Pacific Northwest and California
A slow-moving low-pressure system is forecast to bring long-duration atmospheric river conditions to the U.S. West Coast between…
Pair of mid-level troughs forecast to bring widespread precipitation to California
Two mid-level troughs with associated surface low-pressure systems are forecast to impact California between February 14 and 19,…
Freeze warnings in effect across southern Arizona, southeastern California, and southern Nevada
Freeze warnings remain in effect across much of southern Arizona, southeastern California, and southern Nevada through Saturday morning.…
Back to back atmospheric rivers forecast to bring heavy rain and mountain snow to California
Two atmospheric rivers are forecast to make landfall over California, bringing heavy rain and snow accumulations across Southern…
Winter Storm Warnings across Sierra Nevada, White Mountains, and northern California
Winter Storm Warnings have been issued across the Sierra Nevada, White Mountains, Inyo County, Siskiyou County, Yosemite National…
Strong atmospheric river to bring heavy rain, snow, and flooding to California this week
A strong atmospheric river (AR) is forecast to bring heavy rain, mountain snow, and flooding across much of…
Strong atmospheric river to impact California, up to 500 mm (20 inches) of rain forecast for Sierra Nevada
Multiple atmospheric rivers are forecast to impact California starting today. These will bring several rounds of heavy precipitation,…
Above-normal atmospheric river activity forecast for Northern and Central California in late December
Above-normal AR activity if forecast across most of California during December 22–28. The CW3E multimodel analysis indicates the…
Downtown San Francisco records coldest daytime high for November 30 since 1922
Downtown San Francisco reached only 10°C (50°F) on Sunday, November 30, 2025–the city’s lowest daily maximum for the…
Atmospheric river brings flash-flood threat and evacuation warnings to Los Angeles, California
A multi-day atmospheric river is affecting California, with peak impacts on November 13–14. High integrated vapor transport values…