Unattended brush and campfires are likely to escape. Fires are not likely to become serious and control is relatively easy.Īll fine dead fuels ignite readily and fires start easily from most causes. Short-distance spotting may occur, but is not persistent. The average fire is moderate intensity, although heavy concentrations of fuel, especially draped fuel, may burn hot. Timber fires spread slowly to moderately fast. Fires in open cured grasslands will burn briskly and spread rapidly on windy days. There is little danger of spotting.įires can start from most accidental causes, but with the exception of lightning fires in some areas, the number of starts is generally low. Fires in open cured grasslands may burn freely a few hours after rain, but woods fires spread slowly by creeping or smoldering, and burn in irregular fingers. May 1 - September 31: Highest predicted air temperatureįuels do not ignite readily from small firebrands although a more intense heat source, such as lightning, may start fires in duff or punky wood. Signs will change to “low” when there is sustained rain (over 4 hours). The rating will be “Extreme” when red flags are posted regardless of other weather conditions. Red flags will only be displayed when the National Weather Service declares a “Red Flag Warning” for any portion of Sonoma County. Windy periods with low fuel moisture and relative humidity usually result in Red Flag Warnings. Wind is the most influential factor affecting wildfire spread.Īny reliable weather forecast can be utilized and when in doubt, round up to the next higher rating. Therefore, the signs will display the Fire Danger Rating using air temperature. In general, these factors vary over a geographic area, change each day, and are not practical to continually assess. ![]() ![]() Wildfire ignition potential is determined by the following factors: 1) size and shape of fuels, 2) compactness or arrangement of fuels, 3) fuel moisture content, and 4) fuel temperature. The purpose of the fire danger rating sign is to prevent wildfires by increasing awareness of wildfire ignition and spread potential.
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