May 1, 2021 – Critical Fire Weather Conditions Sunday into Tuesday Due to Gusty Wind and Low Humidity. Gusty north to east wind develops over portions of the Central Valley, Delta, and surrounding foothills Sunday and persists into Tuesday afternoon. Combined with low humidity, this will result in potential critical fire weather conditions. Strongest wind forecast along the west side of the Sacramento Valley. Lighter wind expected Wednesday.

The National Weather Service in Sacramento has issued a Red Flag Warning, which is in effect from 11 AM Sunday to 5 PM PDT Tuesday. The Fire Weather Watch is no longer in effect.

Red Flag Warning May 1, 2021


  • 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-Carquinez Strait and Delta
  • Northern San Joaquin Valley in San Joaquin and Stanislaus Counties Below 1000 ft
  • 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

WIND: North 15 to 25 mph with gusts 30 to 40 mph, strongest west of Interstate 5 and along the foothills of the Coastal Range.

HUMIDITY: Minimum daytime humidity 9 to 20 percent. Maximum overnight humidity generally between 30 and 60 percent, locally lower.

IMPACTS: Any fires that develop will likely spread rapidly. Outdoor burning is not recommended.