Down-Valley Winds are typically less than what mph?

Prepare for the NWCG Introduction to Wildland Fire Behavior Calculations (S-390) Test. Study with interactive questions and explanations to ensure you're ready for the challenge.

Multiple Choice

Down-Valley Winds are typically less than what mph?

Explanation:
Down-valley drainage winds are driven by cool, dense air flowing downhill into valleys, especially at night and early morning. This creates a light, steady flow, typically under 10 mph. Higher speeds (10 mph and above) would require stronger pressure differences or terrain effects and aren’t characteristic of normal drainage winds. So, the typical down-valley wind is less than 10 mph.

Down-valley drainage winds are driven by cool, dense air flowing downhill into valleys, especially at night and early morning. This creates a light, steady flow, typically under 10 mph. Higher speeds (10 mph and above) would require stronger pressure differences or terrain effects and aren’t characteristic of normal drainage winds. So, the typical down-valley wind is less than 10 mph.

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