News Flash

Office of Emergency Services

Posted on: August 17, 2021

Red Flag Warning Tuesday Afternoon Through Wednesday Due to Breezy Winds and Low Humidity

Red Flag Warning 8.17.2021

Locally breezy south to southwest winds expected Tuesday afternoon, especially along the western slopes of the Sierra Nevada. Then winds will shift to the north to northeast and increase Tuesday evening across much of the Sacramento Valley, surrounding terrain, and western slopes of the Sierra Nevada and will continue through Wednesday. These winds, combined with low humidity and extremely dry fuels, will lead to critical fire weather conditions.

Eastern Portion of Shasta/Trinity NF-Burney Basin and Northeast Plateau in Shasta County Including Northwest Lassen NF north of Lassen NP- Northern Sacramento Valley to Southern Tehama County Line Below 1000 Ft-Central Sacramento Valley in Glenn, Colusa, Yuba, Northern Sutter, and Butte County Below 1000 Ft- Southern Sacramento Valley in Yolo- Sacramento Far Western Placer, southern Sutter and Solano County Below 1000 Ft-Southeast Edge Shasta- Trinity NF and Western Portions of Tehama-Glenn Unit- Northern Sierra Foothills from 1000 to 3000 Ft. Includes portions of Shasta-Trinity and Butte Units- Northern Motherlode From 1000 to 3000 Ft. Includes portions of Nevada-Yuba-Placer-Amador and ElDorado Units- Northern Sierra Including Lassen NP and Plumas and Lassen NF/S West of the Sierra Crest (West of Evans Peak-Grizzly Peak- Beckworth Peak)- Northern Sierra Including the Tahoe and ElDorado NF/S West of the Sierra Crest-Eastern Mendocino NF-

1030 AM PDT Tue Aug 17 2021

215, 216, 217, 263, 266, 267, 268, 269, AND 279

* AFFECTED AREA: Much of the Sacramento Valley and surrounding foothill and mountain terrain. Includes fire weather zones 213, 214, 215, 216, 217, 263, 266, 267, 268, 269, and 279.

* WIND...South to southwest winds Tuesday. North to northeast wind gusts of 25 to 35 mph will develop Tuesday night and continue Wednesday. Strongest winds are expected along the western side of the Sacramento Valley and near high elevations and favorably oriented canyons across the foothills and mountains.

* HUMIDITY...Minimum humidity of 9 to 15 percent with moderate to locally poor overnight recoveries.

* IMPACTS...Any active fires or new fires that develop will likely spread rapidly. Outdoor burning is not recommended.


A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior.

  • Register for CodeRED Emergency Alerts:
  • Know Your Evacuation Zone. Find it @  
  • Park your vehicle towards the roadway.
  • Be sure you have a full tank of gas.
  • Keep pets nearby and have a plan to transport large animals.
  • Always check towing equipment and eliminate dragging hazards.
  • Do not use equipment outdoors that may create a spark.
  • Never burn.
  • Have your Go-Bag on hand with enough medication, water, and food to last at least one week.
  • Have a battery-powered radio on hand. (KVMR is the official emergency radio station for Western Nevada County, 89.5 and 105.1 FM.)
  • Connect with your 5 Emergency Allies and share the news about the Red Flag Warning. 

Understand evacuation status definitions*

* Evacuation Order: Immediate threat to life and a lawful order to leave now. The area is lawfully closed to public access

* Evacuation Warning: Potential threat to life and/or property. Those who require additional time to evacuate, and those with pets and livestock should leave now.

NWS Alert Sent Via Email at 10:30 am PDT, August 17, 2021:

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