![]() Record whether the observations were made with an electronic weather sensor or traditional sling psychrometer. ![]() Avoid observations affected by gusty indraft breezes and radiant heat from the fireline. Minimize the fire’s influence on your observation. Generally, ventilated areas in the shade are desirable locations for the observation. If on a slope, the aspect and slope steepness is an important consideration.Ĭonsider what is a representative fuelbed for the fire.Īttempt to find a safe site upwind or on the flank of the fire. The weather observer should strive to pick observation sites that most accurately reflect environmental conditions around the fire’s location.ĭecide whether a ridge-top, mid-slope, or drainage bottom location is most representative. Hourly throughout the afternoon or when changes occur, may be called for by fireline supervisors or dictated by changing conditions to ensure situational awareness.When active fire behavior seems to increase and diminish during the burn period. Location and Timing of Fireline Weather Observationsīelow are four instances during a 24-hour period that are valuable in assessing forecasts and evaluating thresholds associated with fire behavior transitions:Īn early morning observation that represents time and conditions when the minimum temperature and maximum humidity occur.Ī late afternoon observation that represents the time and conditions when the maximum temperature and minimum humidity occur. Sunrise – Sunrise and Sunset Calculator.Single Resource (crew, squad, and individual) are responsible for ensuring that they keep informed of fire weather conditions and forecasts so that they may base all actions on current and expected behavior of the fire. The procedures include obtaining and reviewing latest forecasts, taking observations to validate them through the assignment, reporting what is learned to those who need the information, and requesting forecast updates when appropriate. Take time to review weather forecasts and observe weather changes, fireline observations, and monitoring automated weather stations are helpful to supplement information from forecasts. Weather is the Most Variable Element when Anticipating Fire Behavior Wind Observations from Automated Sensors.Adjusting Relative Humidity for Changes in Temperature and Elevation.Estimating Relative and Dew Point from Psychrometric Tables.Estimate Effective Wind Speed for Slope Influence.Observing Eye-Level Wind Speed in the Field.Estimate or validate Midflame Wind Speed.Visual Surface (20 feet) Wind Estimate - Modified Beaufort Scale.Estimate or Validate 20 feet surface Wind Speed.Consider the Possibility of Critical Wind.Get Forecast from Incident Meteorologist or Fire Weather Forecaster.Communicate and Document the Weather Observation.Location and Timing of Fireline Weather Observations.
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