A Severe Thunderstorm Warning is in effect for Plumas and Sierra counties in California, according to the National Weather Service. The warning is in effect until 4:15PM PDT on September 21, 2026.
The warning covers southern Plumas County and western Sierra County. At 3:29PM PDT, a severe thunderstorm was located 7 miles southeast of Gibsonville, or 9 miles north of Downieville, moving south at 5 mph.
A Severe Thunderstorm Warning indicates that a thunderstorm is occurring or is imminent in the warning area. These storms may produce hail that is one inch in diameter or larger, which could damage vehicles and other property.
For safety, seek shelter inside a well-built structure and stay away from windows. This storm is capable of producing large hail. In case of an emergency, call 911. Follow guidance from the National Weather Service and local authorities. Stay informed through official channels and be prepared to take action if necessary.
