1 advisory is in effect for Sierra County, CA. The most serious is a winter weather advisory.
Since 2016 the National Weather Service has issued about 376 alerts that included Sierra County, roughly 38 a year. The most common is the red flag warning (92 from 2016 to 2025). No tornado warnings were recorded here in that period.
Updated from the National Weather Service · lists refresh hourly; the live map loads current alerts directly from the NWS
Lassen Volcanic National Park; Sierra Nevada of Sierra-Nevada-Placer Counties Above 5000 ft Including Interstate 80; Sierra Nevada of El Dorado-Amador-Northern Alpine Counties Above 5000 ft Including Highway 50; Sierra Nevada of Calavera…Until · NWS Sacramento CA
WINTER WEATHER ADVISORY IN EFFECT FROM 4 PM SUNDAY TO 10 PM PST MONDAY
Full alert text
* WHAT...Snow is expected for elevations above 6000 feet. Total snow
accumulations 2 to 6 inches, with up to 14 inches near Lassen Park.
Winds gusting as high as 40 mph.
* WHERE...Northern Sierra above 6000 feet, including Highway 50,
Interstate 80, State Route 4, State Route 108, Southern Cascades
above 6000 feet, including Lassen National Park.
* WHEN...From 4 PM Sunday to 10 PM PST Monday.
* IMPACTS...The hazardous conditions will impact Sunday evening
travelers, as well as the Monday morning and evening commutes.
* ADDITIONAL DETAILS...Snow levels 6500 to 7500 feet Sunday, dropping
to around 5000 to 6000 Monday. Heaviest snow is expected late
Sunday night into Monday morning. Lull in activity expected on
Tuesday, followed by a colder, stronger system by mid-week.
What to do: Check the latest road conditions from Caltrans online at
quickmap.dot.ca.gov or dial 5 1 1.
Map data: NWS, OpenFreeMap, OpenStreetMap
Recent alerts in Sierra County
Issued
Alert
Area
Nov 14, 1:55 PM EST
Winter Weather Advisory
Lassen Volcanic National Park; Sierra Nevada of Sierra-Nevada-Placer Counties Above 5000 ft Including Interstate 80; Sierra Nevada of El Dor
Sierra County alert history
Alert events that included Sierra County or its forecast zones, from the NWS warning archive.