87% Introduction to Fire Behavior: Influences of Topography, Fuels, and Weather on Fire Ignition and Spread Quiz

Which of the following factors has the greatest effect on weather and fire conditions?

- Vegetation density

The midlevel trigger critical fire weather pattern occurs primarily over the western United States and is often associated with which of the following conditions?

(8 of 9 points) ■ Early morning inverted V sounding ■ Dry lightning ■ Moderate midlevel winds ■ Moisture tongue on water vapor imagery

Which of the following best describes typical fire spread behavior within a mountain valley?

- Spreads upslope in the morning and downslope in the afternoon

The graphic shown here is an example of critical fire weather pattern, which produce strong gusty winds that most often first surface during the hours.

■ East Winds ■ Nighttime

Sea breeze fronts are of little concern to fire managers because although they can produce strong, shifting winds, the increase in moisture effectively reduces fire danger.

■ False

are embers or sparks carried by strong winds ahead of the main fire often resulting in .

■ Firebrands ■ Spot Fires

The graphic shown here is an example of a _____ critical fire weather pattern often accompanied by dry conditions and strong winds.

■ Foehn

Which of the following are characteristics of north-facing slopes?

■ Highest average humidity ■ More timber fuels ■ Latest curing of fuels ■ Lower average temperature ■ Slowest rate of fire spread

Thermal belts form during the and are found near the . In the thermal belt temperatures are and humidity is than is typically observed in surrounding areas.

■ Night ■ Mid-Slope ■ Higher ■ Lower

Which slope aspect typically experiences the strongest upslope winds and potential for more rapid fire spread?

■ South-facing

The sea breeze front critical fire weather pattern occurs most often over the and coastal regions. The primary impacts on fire conditions prior to the passage of the sea front include and .

■ Southeast ■ Gulf of Mexico ■ Fire Intensification ■ Shifting Winds

Wind speed affects the shape of a fire in that a wind will create a -long elliptical shaped fire. When the wind is , the fire takes on a rounded shape.

■ Stronger ■ Lighter

The fuel type that is the greatest contributor to the intensity and spread of fires is _____.

■ Surface fuels

Crown fires are typically the most intense type of fire and can spread at rates of up to 5 miles per hour or more. Fire suppression techniques with crown fires are typically ineffective.

■ True

Low-level jet patterns occur in part of the country and are often characterized by the presence of a(n) wind profile in the morning hours.

■ any ■ reverse

The graphic shown here is an example of a _____ critical fire weather pattern often accompanied by dry thunderstorms with strong, gusty winds.

■ breakdown of upper ridge

In _____ fuels, significant moisture changes can occur on a seasonal basis, and in _____fuels significant moisture changes can occur on a daily basis.

■ live | dead