...FIRE DANGER STATEMENT IN EFFECT FROM THURSDAY MORNING THROUGH THURSDAY EVENING... DRY HIGH PRESSURE BUILDING INTO THE REGION WILL BRING GUSTY NORTHWEST WINDS OF 15 TO 20 MPH AND RELATIVE HUMIDITY VALUES BOTTOMING OUT BETWEEN 20 AND 25 PERCENT. THESE CONDITIONS WILL LEAD TO AN ENHANCED FIRE DANGER ON THURSDAY...ESPECIALLY IN THE AFTERNOON. Fire danger is the probability of a fire to start, the rate of spread and intensity of its burn. This probability is influenced by fuel type, fuel moisture, amount of fuel, and slope of the
land area. Another important influence is weather, particularly wind and relative humidity.
When relative humidity is below 50%, prescribed burning during the summer does best. During the Spring or Fall Fire Season, a relative humidity below 40% can mean that any wildfires will be difficult to control. Wind causes a fire to burn more intensely, and increases the spread of fire by carrying hot embers to new fuel sources. Fuels with a low Fuel Moisture will burn very hot.
Weather data (temperature, relative humidity, wind direction, wind speed, and rainfall in the last 24 hours) from National Weather Service stations and local forestry offices is analyzed every morning. This analysis results in a predicted fire danger class day, which is broadcast statewide at 10 am daily. When conditions are critical by 2 pm, the day's weather data has been analyzed and an actual fire danger class day is broadcast statewide if necessary.