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The original item was published from 9/8/2021 11:54:00 AM to 8/18/2022 12:00:00 AM.

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Posted on: August 17, 2021

[ARCHIVED] August 18th Red Flag Warning Canceled Early

News Flash_Red Flag Warning Canceled_8.18.21

UPDATE 8/18/21 AT 12:00 P.M.

Winds have subsided in the North Bay Mountains which allowed the National Weather Service to cancel the Red Flag Warning a little early. Little to no winds materialized in the Santa Rosa area as of noon today. Residents in Sonoma County can still expect smoke from the Northern California wildfires to push into our region.

Red Flag Warning Canceled_8.18.21



NOTE: Today’s Test of the NOAA Weather Radios and SoCoAlert for Fountaingrove 2 and Montecito Zones will still occur as scheduled (

SMOKE: Expect smoke from the Northern California Fires to continue to push into Sonoma County as the winds increase today into tomorrow.

The National Weather Service is forecasting critical fire weather conditions from late this evening (Tuesday, 8/17) into tomorrow afternoon (Wednesday, 8/18) over the interior North Bay Mountains due to gusty offshore winds and low humidity. Another round of winds are expected locally again Thursday night (8/19). The areas of greatest concern are across the hills and mountains of Napa County where minimum relative humidity values will drop into teens along with wind gusts up to 45 to 55 mph. There is the potential these stronger winds and low humidity could also spread into the interior hills of Sonoma County.

- AFFECTED AREA... Area of greatest concern will be across the interior North Bay Mountains of Napa County.
- TIMING... 11 PM Tuesday through 3 PM Wednesday.
- WINDS... North to northeast winds 10 to 25 mph with gusts up to 45 mph, locally up to 55 mph in the highest peaks.
- RELATIVE HUMIDITY... Minimum humidity of 10 to 15 percent expected Wednesday.
- IMPACTS... Any fire starts would likely see rapid spread due to dry fuels, low humidity and gusty winds.

PG&E PSPS – Public Safety Power Shutoff: There are very minimal impacts planned for the City of Santa Rosa at this time.

Review the evacuation checklists and other information at

Red Flag Warning_8.17.21

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