Weather Updates

October 23, 2020 - RED FLAG WARNINGS & WIND ADVISORY

The National Weather Service (NWS) has issued: 

  • A Red Flag Warning for North Bay Interior Valleys for strong winds and critically low humidity, which is in effect from 11 a.m. Sunday (10/25) to 5 p.m. Monday (10/26).  (The time length for this Warning was extended by the NWS on 10/25 at 2:29 p.m.)

  • A Red Flag Warning for North Bay Mountains for strong winds and critically low humidity, which is in effect from 11 a.m. Sunday (10/25) to 5 a.m. Tuesday (10/27).

RELATIVE HUMIDITY: Minimum daytime humidity of 5 to 10 percent. Maximum overnight humidity generally between 15 and 25 percent.
HIGHEST THREAT: Highest ridges and peaks of the interior North Bay Mountains and the Diablo Range.
IMPACTS: Any fires that develop will likely spread rapidly. Outdoor burning should be avoided.
PRECAUTIONARY/PREPAREDNESS ACTIONS: 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.

  • A Wind Advisory for the North Bay, including all of Santa Rosa in effect from 4 p.m. Sunday (10/25) through 11 a.m. Monday (10/26).

WHAT: Northeast winds 20 to 35 mph with gusts up to 50 mph likely in the lower elevations. In the hills northeast winds 25-35 mph with gusts 60-70 mph for the highest peaks of the North and East Bay hills
WHERE: The entire San Francisco Bay Region.
WHEN: From late Sunday afternoon through Monday morning. The strongest winds will be during the overnight hours of Sunday night into Monday morning.
IMPACTS:  Damaging winds could blow down trees and power lines. Widespread power outages are possible. Travel could be difficult, especially for high profile vehicles.

Important Notes:  In addition to fire weather concerns these winds will have the potential to bring down fire weakened trees and branches across the region. Any temporary structures such as tents and scaffolding will be compromised. This event has the potential to be as strong or stronger as winds during the 2017 wine country fires with widespread potential for damaging winds throughout the Bay Area Sunday night.

Precautionary/ Preparedness Actions:

  • Businesses participating in outdoor dining should prepare to secure loose items and temporary structures.
  • Monitor the latest forecasts and warnings for updates on this situation. Fasten loose objects or shelter objects in a safe location prior to the onset of winds.

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