Up-Valley Winds are typically in which speed range?

Up-Valley Winds are typically in which speed range?

• A. 10-15 mph
• B. 5-9 mph
• C. 0-3 mph
• D. 20-25 mph

Answer: (A)

Up-valley winds arise from daytime heating in the valley: as the valley floor warms, the air rises and moves upslope along the valley toward higher elevations. This creates a moderate, persistent flow that is typically around 10 to 15 mph. That speed range is common enough to be considered the usual strength of this pattern, providing a noticeable but not extreme influence on fire behavior. Speeds much lower (5–9 mph or 0–3 mph) would feel weak or nearly calm, while speeds that high (20–25 mph) would indicate a much stronger, more gusty flow than is typical for standard up-valley winds.

Up-valley winds arise from daytime heating in the valley: as the valley floor warms, the air rises and moves upslope along the valley toward higher elevations. This creates a moderate, persistent flow that is typically around 10 to 15 mph. That speed range is common enough to be considered the usual strength of this pattern, providing a noticeable but not extreme influence on fire behavior. Speeds much lower (5–9 mph or 0–3 mph) would feel weak or nearly calm, while speeds that high (20–25 mph) would indicate a much stronger, more gusty flow than is typical for standard up-valley winds.