Downslope Winds typically range in speed from:

Downslope Winds typically range in speed from:

• A. 2-5 mph
• B. 6-10 mph
• C. 0-1 mph
• D. 10-15 mph

Answer: (A)

Downslope winds are gravity-driven air drainage along slopes, so they tend to be gentle rather than strong. The typical speed is about 2 to 5 miles per hour because air accelerates only modestly as it drains downslope, especially under stable boundary-layer conditions common at night and in the early morning. This drainage occurs when cooler air at higher elevations flows downslope and pools in lower terrain, with the slope and surrounding terrain keeping the flow relatively light. In terms of fire behavior, these light winds can still affect fuel drying and flame tilt along the slope, even though they aren’t strong enough to drive rapid spread on their own. Higher gusts (6–10 mph or 10–15 mph) or near-calm conditions (0–1 mph) are less typical for standard downslope drainage, making the 2–5 mph range the best fit.

Downslope winds are gravity-driven air drainage along slopes, so they tend to be gentle rather than strong. The typical speed is about 2 to 5 miles per hour because air accelerates only modestly as it drains downslope, especially under stable boundary-layer conditions common at night and in the early morning. This drainage occurs when cooler air at higher elevations flows downslope and pools in lower terrain, with the slope and surrounding terrain keeping the flow relatively light. In terms of fire behavior, these light winds can still affect fuel drying and flame tilt along the slope, even though they aren’t strong enough to drive rapid spread on their own. Higher gusts (6–10 mph or 10–15 mph) or near-calm conditions (0–1 mph) are less typical for standard downslope drainage, making the 2–5 mph range the best fit.