U.S. Alerts  
El Dorado Weather Logo
U.S. Color IR Sat North America Color Background Satellite Thumb
Norcal Dual-Pol Radar Live Northern California Doppler Radar Thumbnail Image
W. Coast IR Satellite West Coast Infrared Satellite
Live Lightning Radar Placerville California Lightning Detection Radar Thumbnail Image
Live Streaming Webcam Placerville California Live Streaming WebCam Thumbnail Image
Local Wx Station Data Sacramento, Northern Sierra Nevada & the Motherlode Area Current Weather Conditions

Sierra County Alerts
Skywarn Logo
Noaa Logo
Noaa Logo 2
NOAA's National Weather Service
Each location shows all alerts on one page:
WARNINGS - WATCHES - ADVISORIES - STATEMENTS
Updates every 15 Minutes
Updated:September 25, 2026 3:45 am PDT

Red Flag Warning RED FLAG WARNING  
Sierra County

Effective: Thu, 9/24 10:28am Severity:  Severe 
Updated: September 25, 2026 3:45 am Urgency: Expected
Expires: Fri, 9/25 10:30am Certainty: Likely

Areas Affected: Northern Sierra Front - Carson City/Douglas/Storey/Southern Washoe/Eastern Lyon/Far Southern Lassen Counties - Southern Sierra Front - Alpine/Northern Mono/Southern Lyon/Western Mineral Counties
 
Alert Details:
The National Weather Service in Reno has issued a Red Flag
Warning for gusty winds and low humidity, which is in effect from
noon to 10 PM PDT Friday. The Fire Weather Watch is no longer in
effect.

* CHANGES...Fire Weather Watch upgraded to a Red Flag Warning.

* Affected Area...Fire Weather Zone 420 Northern Sierra Front
including Carson City, Douglas, Storey, Southern Washoe,
Western Lyon, and Far Southern Lassen Counties, Fire Weather
Zone 421 Southern Sierra Front including Alpine, Northern
Mono, Southern Lyon, and Western Mineral Counties.

* Winds...Southwest to west winds 20 to 30 mph with gusts up to
45 mph.

* Humidity...As low as 17 percent in the afternoon.

* Duration...4 to 7 hours.

* Impacts...The combination of gusty winds and low humidity can
cause fire to rapidly grow in size and intensity before first
responders can contain them.

Information:
Avoid outdoor activities that can cause a spark near dry
vegetation, such as yard work, target shooting, or campfires.
Follow local fire restrictions. Check weather.gov/reno for
updates and livingwithfire.info for preparedness tips.
Lake Wind Advisory LAKE WIND ADVISORY  
Sierra County

Effective: Thu, 9/24 12:09pm Severity:  Moderate 
Updated: September 25, 2026 3:45 am Urgency: Expected
Expires: Fri, 9/25 5:00pm Certainty: Likely

Areas Affected: Lassen-Eastern Plumas-Eastern Sierra Counties - Greater Lake Tahoe Area - Greater Lake Tahoe Area
 
Alert Details:
* WHAT...Southwest winds 10 to 20 mph with gusts up to 35 mph. Waves
1 to 3 feet on Lake Tahoe.

* WHERE...Greater Lake Tahoe Area, and Lassen-Eastern Plumas-Eastern
Sierra Counties.

* WHEN...From 8 AM to 8 PM PDT Friday.

* IMPACTS...Strong winds and rough waves on area lakes will create
hazardous conditions for small craft.

Information:
Check lake conditions before heading out and be prepared for a sudden
increase in winds and wave heights. Consider postponing boating
activities on the lake until a day with less wind.