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20 Cards in this Set
- Front
- Back
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Which weather factor has the greatest impact on fire behavior? |
Wind |
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Passage of a frontal system is important because of? |
The wind direction will change. |
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Surface winds are measured at ___ feet above the ground. |
20 feet. |
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Winds generally blow which direction in the day time? |
From the sea. |
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Foehn winds are important because they are ___? |
Warm and dry. |
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A Haines index of 6 indicates what? |
Very dry and unstable atmosphere. |
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Cumulonimbus clouds indicate what? |
Thunderstorms which can be detrimental to a fire. |
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The slope aspects most vulnerable to fire are? |
South and southwest aspects. |
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Dangerous topographic features include? |
Canyons and chimneys. |
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Several types of barriers that break fuel are? |
Rocks or bare soil, lakes and streams, roads and trails, changes in fuel type/moisture, and old burns. |
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The two kinds of fuel moisture are? |
Dead fuel moisture and live fuel moisture. |
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The time it takes for the moisture content of fuels and the surrounding air to equalize is called? |
Time lag. |
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The key fuel factors affecting rate of spread are? |
Compactness, horizontal continuity, vertical continuity |
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The most important weather components of fire behavior are? |
Wind, temperature, and relative humidity. |
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The most important fuel components of fire behavior are? |
Fuel moisture and temperature. |
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The most important topographic components in fire behavior are? |
Steepness of slope and aspect. |
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The critical factor for the rate of spread and intensity is? |
Wind. |
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What three factors determine the direction a wildfire will burn? |
Wind, slope, and condition of the fuel. |
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List the seven fire environment indicators. |
1. Fuel characteristics 2. Fuel moisture 3. Fuel temperature 4. Topography/aspect 5. Wind 6. Atmospheric stability 7. Fire behavior |
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List the four topographic or terrain indicators of fire behavior. |
1. Steep slopes 2. Box canyons or chutes 3. Saddles 4. Narrow canyons |
