Updated: 5/11/21 at 1:00 PM
RED FLAG WARNING IS CANCELLED FOR OFFSHORE WINDS AND LOW HUMIDITY FOR THE NORTH AND EAST BAY HILLS AS WELL AS THE INTERIOR
VALLEYS OF THE EAST BAY...
The National Weather Service in San Francisco has cancelled the Red Flag Warning.
While very dry conditions will persist across the interior through Tuesday afternoon (5/11). offshore winds continue to diminish and therefore so will the threat of critical fire weather conditions.
**Red Flag Warning EXTENDED**
The current Red Flag Warning has been extended through Tuesday (5/11) at 6PM. It was originally set to expire tomorrow morning. Conditions have briefly moderated but offshore winds will gradually increase again Sunday night into Monday morning across the North and East Bay hills. The latest forecasts now suggest conditions will worsen Monday night into Tuesday morning as another burst of strong offshore winds develops in the hills. This will occur with very low humidity values and drought stressed fuels.
* AFFECTED AREA - North Bay Mountains
* TIMING - Through 6 pm Tuesday. The most dangerous time will be the overnight hours of Monday evening into Tuesday morning when another burst of strong offshore winds will impact the hills.
* WINDS - Elevations below 2000 feet, northerly winds 10 to 15 mph with gusts up to 40 mph. Elevations from 2000 feet and above, northerly winds of 15 to 25 mph with peak gusts to around 50 mph and local gusts to 60 mph highest peaks.
* RELATIVE HUMIDITY - As low as 5 to 15 percent, driest Monday and Tuesday afternoon with little or no recovery Monday night.
* TEMPERATURES - In the 80s and lower 90s afternoon hours with nighttime lows 50s in the valleys and 60s in the hills where winds are strongest.
* IMPACTS - New ignitions could experience rapid fire growth.
Please continue to head to the warnings to limit outdoor activities that could start a wildfire. Use this time to take precautionary measures that include clearing leaves out of roof gutters and off of roofs, trim trees 10’ away from roof lines (using manual tools). Powered machinery such as mowers and other equipment that could spark a wildfire should be used before 10am and never when it’s excessively how, dry and windy.
Visit: www.srcity.org/ReadySR, www.srcity.org/WUI and www.srcity.org/WeatherAlerts for more information
Original Post: 5/7/21
**RED FLAG WARNING IN EFFECT FROM 11 PM FRIDAY, 5/7 TO 6 AM PDT MONDAY, 5/10 FOR AREAS INCLUDING THE NORTH BAY HILLS**
The NWS is forecasting a moderate early season offshore wind event. This will occur as fuels are near record dry levels after a very dry winter. 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.
* AFFECTED AREA - North Bay Mountains over 1000ft in elevation. Although this does not includes areas such as the valley floor of Santa Rosa, residents should be aware of the conditions in the area.
* TIMING - 11 pm tonight (Friday 5/7) through 6 am Monday (5/10)
* WINDS - Northerly winds 15 to 30 mph gusts 40 to 50 mph except locally to 60 mph above 2500 feet.
* RELATIVE HUMIDITY - Lowering 20-30 percent by Saturday morning then dropping 10-20% Saturday and Sunday afternoon with only moderate night time recovery.
* TEMPERATURES - Highs into the 80s and lower 90s Saturday and Sunday afternoon.
* IMPACTS - New fires could see rapid fire growth.
PRECAUTIONARY/PREPAREDNESS ACTIONS: Whether working to create defensible space around your home, just mowing the lawn, or pulling your dirt bike over to the side of the road, if you live in a wildland area you need to use all equipment responsibly. Lawn mowers, weed-eaters, chain saws, grinders, welders, tractors, and trimmers can all spark a wildland fire. Do your part, the right way, to keep your community fire safe.
Mow before 10 a.m., but never when it’s windy or excessively dry. Lawn mowers are designed to mow lawns, not weeds or dry grass. Metal blades striking rocks can create sparks and start fires. Use caution.