S-290 UPDATED ACTUAL FINAL EXAM
QUESTIONS AND ANSWERS SURE A+
✔✔Why do dry climates usually have lower nighttime temperatures than humid
climates? - ✔✔Because there is less water vapor in the air to absorb and reflect heat
back to the surface at night.
✔✔T/F On average the RH doubles with each 20F decrease of temperature, or halves
with each 20F increase in temperature. - ✔✔True
✔✔T/F The lowest RH occurs with the highest temperature. - ✔✔True
✔✔T/F RH is usually lower on north aspects. - ✔✔False
✔✔T/F Cloudiness has little affect on relative humidity and temperature. - ✔✔False
✔✔T/F The type of vegetation has little affect on temperature and humidity. - ✔✔False
✔✔T/F RH measures the amount of moisture in the air. - ✔✔True
✔✔S/U Clouds form in layers. - ✔✔Stable
, ✔✔S/U Gusty winds - ✔✔Unstable
✔✔S/U Smoke column spreads out after limited rise. - ✔✔Stable
✔✔S/U Clouds grow vertically - ✔✔Unstable
✔✔S/U Firebrands are lifted into convection column. - ✔✔Unstable
✔✔T/F Temperature decreases with an increase in elevation when an inversion is
present. - ✔✔False
✔✔What is the general effect of stable air on wild land fires? - ✔✔Fire activity
decreases
✔✔What conditions will occur under a surface inversion during the morning hours? -
✔✔All of the above
Temperatures are cool, winds are calm or light
Fire activity is decreased
Pollutants can accumulate under inversions
✔✔What are the different lighting processes that can lead to thunderstorm
development? - ✔✔Frontal, orographic, thermal, convergence
✔✔T/F Unstable air can often be found in low pressure systems and on the leading
edge of cold fronts. - ✔✔True
✔✔T/F Unstable air can be formed by either heating the air near the ground or by
cooling the air aloft. - ✔✔True
✔✔Wind direction is: - ✔✔The direction the wind is blowing from.
✔✔A wind is caused by: - ✔✔The direction the wind is blowing from.
✔✔A slope wind is caused by: - ✔✔Warm air rising and cold air settling.
✔✔Foehn winds can adversely affect wild land fires because they can produce: -
✔✔Strong winds, warmer temperatures, and very low RH.
✔✔When stable air is forced over a mountain range, and then descends the leeward
slopes as dry, warmed air, it is called: - ✔✔A foehn wind
✔✔T/F Bends in canyons are likely places for wind eddies to form. - ✔✔True
QUESTIONS AND ANSWERS SURE A+
✔✔Why do dry climates usually have lower nighttime temperatures than humid
climates? - ✔✔Because there is less water vapor in the air to absorb and reflect heat
back to the surface at night.
✔✔T/F On average the RH doubles with each 20F decrease of temperature, or halves
with each 20F increase in temperature. - ✔✔True
✔✔T/F The lowest RH occurs with the highest temperature. - ✔✔True
✔✔T/F RH is usually lower on north aspects. - ✔✔False
✔✔T/F Cloudiness has little affect on relative humidity and temperature. - ✔✔False
✔✔T/F The type of vegetation has little affect on temperature and humidity. - ✔✔False
✔✔T/F RH measures the amount of moisture in the air. - ✔✔True
✔✔S/U Clouds form in layers. - ✔✔Stable
, ✔✔S/U Gusty winds - ✔✔Unstable
✔✔S/U Smoke column spreads out after limited rise. - ✔✔Stable
✔✔S/U Clouds grow vertically - ✔✔Unstable
✔✔S/U Firebrands are lifted into convection column. - ✔✔Unstable
✔✔T/F Temperature decreases with an increase in elevation when an inversion is
present. - ✔✔False
✔✔What is the general effect of stable air on wild land fires? - ✔✔Fire activity
decreases
✔✔What conditions will occur under a surface inversion during the morning hours? -
✔✔All of the above
Temperatures are cool, winds are calm or light
Fire activity is decreased
Pollutants can accumulate under inversions
✔✔What are the different lighting processes that can lead to thunderstorm
development? - ✔✔Frontal, orographic, thermal, convergence
✔✔T/F Unstable air can often be found in low pressure systems and on the leading
edge of cold fronts. - ✔✔True
✔✔T/F Unstable air can be formed by either heating the air near the ground or by
cooling the air aloft. - ✔✔True
✔✔Wind direction is: - ✔✔The direction the wind is blowing from.
✔✔A wind is caused by: - ✔✔The direction the wind is blowing from.
✔✔A slope wind is caused by: - ✔✔Warm air rising and cold air settling.
✔✔Foehn winds can adversely affect wild land fires because they can produce: -
✔✔Strong winds, warmer temperatures, and very low RH.
✔✔When stable air is forced over a mountain range, and then descends the leeward
slopes as dry, warmed air, it is called: - ✔✔A foehn wind
✔✔T/F Bends in canyons are likely places for wind eddies to form. - ✔✔True
