Question: What two components of the Earth’s atmosphere are most important to wildland firefighting group of answer choices?

The two most important weather, or weather related, elements affecting wildland fire behavior are wind and fuel moisture. Of the two, wind is the most variable and the least predictable. Winds, particularly near the earth’s surface, are strongly affected by the shape of the topography and by local heating and cooling.

What 3 weather factors are most important to wildland firefighters?

Weather conditions such as wind, temperature, and humidity also contribute to fire behavior. Wind is one of the most important factors because it can bring a fresh supply of oxygen to the fire and push the fire toward a new fuel source.

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What are the two primary weather services for wildland firefighting?

What are the two most important weather-related elements affecting wildland fire behavior? Wind & Fuel Moisture.

What weather factor has the greatest impact on fire behavior?

Arguably, temperature, is the single most important weather factor affecting fire behavior. Some might say that relative humidity is most important but we will learn that temperature drives relative humidity. Fuel temperatures also affect a fires rate of spread.

What are three contributing factors to extreme fire behavior?

Identify the THREE fuel factors MOST indicative of factors leading to problem or extreme fire behavior. The correct answers are characteristics, moisture, and temperature.

What are the 4 main factors influencing fire spread?

Fire spread depends on the principal methods of heat transfer: conduction, convection, radiation and direct burning.

What factors contribute to wildfires?

Many factors govern a wildfires’ behavior.

Weather includes wind, temperature, cloudiness, moisture and air pressure. High temperatures and low humidity cause vegetation to dry and wildfires to burn rapidly. Wind not only moves wildfires across landscapes, but also supplies oxygen that can cause fires to grow swiftly.

Which is a component of the wildland fire triangle?

There are three components needed to start a fire: fuel, oxygen, and heat. This is commonly referred to as the fire triangle. If any one of the components is missing, a fire cannot occur.

What are two types of weather forecast products or service provided by predictive services?

Predictive Services consists of three primary functions: Fire weather and climate – Meteorologists analyze a variety of weather products and services to provide briefings and outlooks for current and forecasted conditions, and in some cases provide spot weather and smoke forecasts.

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What significant impact can Windwave action have on firefighting?

Wind carries away moisture-laden air and hastens the drying of wildland fuels. Once a fire ignites, wind aids combustion by increasing the supply of oxygen. Wind increases fire spread by carrying heat and burning embers to new fuels (spotting).

Does altitude affect wildland fire behavior?

Elevation affects fire behavior by influencing the amount and timing of precipitation, as well as exposure to prevailing wind. Elevation also affects the seasonal drying of fuel.

What are four types of temperature inversions and their influence on wildland fire behavior?

The four types of atmospheric inversions – nighttime, frontal, marine and subsidence – can produce poor visibility and smoke dispersal conditions, on one hand, and rapid fire growth due to erratic winds and inversion dissipation, on the other.

What topographical aspect of a wildland fire is typically most active?

Slope The amount or degree of incline of a hillside (a steep slope). Fires burn more rapidly uphill than downhill. The steeper the slope, the faster the fire burns.

What are the three primary methods of transport firebrands on wildland fires?

With spot fires, new ignitions occur outside the main fire perimeter. The three methods of mass transport of firebrands are: Convection. Wind.

Which of the following fire environment characteristics contribute to extreme fire behavior?

Extreme fire behavior usually results from a combination of environmental factors that include: Available fuels. Wind. Low fuel moistures.

What are extreme fire behavior characteristics and how would they influence the fire environment?

Extreme implies a level of fire behavior characteristics that ordinarily precludes methods of direct control action. One or more of the following is usually involved: high rate of spread, prolific crowning and/or spotting, presence of fire whirls, strong convection column.

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