Red Card Fire Behavior & Weather 2

Question 1

Which fuel moisture level is considered critically dry and significantly increases fire danger?

Accepted Answer

Below 15%

Answer

Live fuel moisture below 15% is critically dry and represents extreme fire danger with rapid fire spread potential.

Question 2

What is a 'fire whirl' and why is it dangerous to firefighters?

Accepted Answer

A spinning vortex of fire that can unpredictably change direction and carry embers long distances

Answer

Fire whirls are rotating columns of fire created by intense heat and turbulent winds that can move erratically and loft burning material far ahead of the main fire.

Question 3

During a temperature inversion, how does smoke and fire behavior typically change?

Accepted Answer

Smoke is trapped near the ground and fire behavior is generally more moderate

Answer

Temperature inversions trap cooler air and smoke near the surface, suppressing convective columns and generally moderating fire behavior until the inversion breaks.

Question 4

What does the term 'spotting distance' refer to in wildland fire behavior?

Accepted Answer

The distance burning embers are carried ahead of the main fire front

Answer

Spotting distance is how far firebrands (burning embers) are transported by wind or convection columns beyond the main fire, creating new ignition points.

Question 5

Which type of wind shift is most dangerous for firefighters working near a fire's flanks?

Accepted Answer

A sudden 90-degree shift that converts a flank into a head

Answer

A 90-degree wind shift can instantly turn a slow-moving flank into a fast-advancing head fire, trapping firefighters who were working what seemed like a safe position.

Red Card - Wildland Firefighter Red Card Certification Practice Test

Red Card - Wildland Firefighter Red Card Certification Practice Test

Red Card Fire Behavior & Weather 2