S-290 FINAL EXAM NEWEST ACTUAL EXAM

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S-290 FINAL EXAM NEWEST ACTUAL EXAM

QUESTIONS WITH 100% CORRECT VERIFIED

ANSWERS/ GRADED A+

What is the general effect of stable air on wild land fires? - ANSWER - Fire activity decreases

What conditions will occur under a surface inversion during the morning hours? - ANSWER - 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? - ANSWER - Frontal, orographic, thermal, convergence

When a cold front or thunderstorms are forecast in the vicinity of a fire, what is the most important information a security weather watch can provide? - ANSWER - Strong shifting winds

The criteria for determining a Red Flag Warning is a combination of high to

extreme fire danger and a critical fire weather pattern such as: - ANSWER -

All of the above Dry lightning Lightning following an extremely dry period Unusually low RH Very dry and unstable air 1 / 3

pg. 2 T/F Unstable air can often be found in low pressure systems and on the leading edge of cold fronts. - ANSWER - True

Wild land fire behavior in the third dimension: - ANSWER - All of the above

Presents a vertical dimension to fire suppression Exhibits crowning, spotting, and vortex phenomena.May affect the atmosphere near the fire.

• factors that are responsible for the occurrence of fire behavior in the third

dimension are: - ANSWER - Available fuels, wind, low atmospheric

moisture, and instability.

Three stages of crown fire development are: - ANSWER - Passive, active,

and independent.

T/F Crown fire development depends on crown flammability along with adequate surface-to-crown and crown-to-crown heat transfer. - ANSWER - True

The factors that contribute to the spotting problem can be classified into

three general areas: - ANSWER - Firebrand source, transportation, and the

receiving fuel.

Probability of ignition is determined by: - ANSWER - Fuel shading, fine

dead fuel moisture percent, and dry bulb temperature.

T/F Vortices are grouped as vertical or horizontal depending on their axis of rotation. - ANSWER - True 2 / 3

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When the wild land fire environment is dominated by a ______ fire, the convection column overpowers the wind field. - ANSWER - Plume- dominated

T/F Continous fine fuels, heavy fuel loadings, ladder fuels, crown spacing, and special fuel situations are fuel characteristics that should NOT be monitored. - ANSWER - False

Low RH and a high 1000 hour timelag fuel moisture are both critical fuel moisture indicators that should be monitored. - ANSWER - False

T/F Unstable air can often be found in low pressure systems and on the leading edge of cold fronts. - ANSWER - True

Foehn winds can adversely affect wild land fires because they can

produce: - ANSWER - 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: - ANSWER - A foehn wind

T/F Bends in canyons are likely places for wind eddies to form. - ANSWER

• True

Local winds are best defined as: - ANSWER - Small scale convective winds

of local origin caused by differences in heating and cooling.

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