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Sonoma County Sheriff's Office
Thursday June 28th, 2018 :: 10:11 a.m. PDT


Red Flag Warning until 11:00PM Saturday

...Gusty northerly winds coupled with low humidity values Friday Night through Saturday... .Dry northerly flow is forecast to develop over the North Bay during the day Friday with temperatures warming to above seasonal averages. Northeast winds will strengthen Friday night into early Saturday morning with poor relative humidity recoveries followed by even warmer and drier conditions during the day Saturday. The areas of greatest concern will be located in higher terrain of Napa County as well as far eastern Sonoma County. Any fire starts may spread rapidly in these conditions. Avoid activities that may lead to fire ignition, including lawn work, driving on grass, tossing cigarettes, lighting campfires or fireworks, especially Friday night into Saturday afternoon. ...RED FLAG WARNING IN EFFECT FROM 11 PM FRIDAY TO 11 PM PDT SATURDAY FOR GUSTY NORTHERLY WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 507... The National Weather Service in San Francisco has issued a Red Flag Warning, which is in effect from 11 PM Friday to 11 PM PDT Saturday.

* AFFECTED AREA...Fire weather zone 507, especially higher elevations of Napa County and far eastern Sonoma County.

* WIND...Northerly winds of 15 to 30 mph with gusts to 40 mph. Isolated peaks and ridges could experience locally stronger winds, especially Friday night.

* HUMIDITY...Minimum humidity readings of 10 to 20% will be common during the day, with the driest locations dropping into the single digit range during the warmest, driest, windiest times of the day. Overnight humidity recoveries will be poor and less than 30%.

* IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning or other activities that may lead to fire creation are 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.

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Sonoma County Sheriff's Office
2796 Ventura Ave
Santa Rosa, CA 95403

Emergency: 9-1-1
Non-emergencies: 707-565-2650

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Alert Details

Severe - Significant threat to life or property
Expected - Responsive action SHOULD be taken soon (within next hour)
Likely (p > ~50%)
Meteorological (inc. flood)
Red Flag Warning

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