Time Lag 100 hour fuels are typically within which diameter range?

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

Time Lag 100 hour fuels are typically within which diameter range?

Time lag fuels are categorized by how quickly a fuel particle responds to heating, and that response depends on its diameter. The 100-hour class represents mid-size fuels whose heat-up and burn are slower than fine fuels but not as slow as the largest fuels. In practice, mid-sized materials like small branches or limbs around 1 to 3 inches in diameter fall into this range, giving a moderate lag that’s on the order of a hundred hours to respond to changing fire conditions.

So the 1-3 inch range best fits the 100-hour fuels. The very fine fuels (less than a quarter inch) respond quickly and are associated with shorter lags, while larger fuels (several inches across) have longer lags and fall into other categories.

Time Lag 100 hour fuels are typically within which diameter range?

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.

Time Lag 100 hour fuels are typically within which diameter range?

Get the latest from Passetra