Which statement about Category 5 Smoke nighttime dispersion is true?

Which statement about Category 5 Smoke nighttime dispersion is true?

• A. Nighttime dispersion is fair to excellent.
• B. Nighttime dispersion is poor.
• C. Nighttime dispersion is unpredictable.
• D. Nighttime dispersion does not occur.

Answer: (A)

Nighttime dispersion is shaped by how stable the atmosphere is and how much vertical mixing can still occur. For Category 5 Smoke, the guidance indicates that nighttime dispersion can be fair to excellent, meaning conditions at night can still dilute the smoke reasonably well under typical patterns. This reflects the idea that even after sunset, factors like terrain effects, residual winds, and occasional nocturnal mixing can carry and dilute the plume effectively, preventing excessive accumulation near the burn area. The other statements don’t fit because they suggest consistently poor, unpredictable, or nonexistent dispersion at night, which isn’t the expected outcome for Category 5 under the standard dispersion expectations.

Nighttime dispersion is shaped by how stable the atmosphere is and how much vertical mixing can still occur. For Category 5 Smoke, the guidance indicates that nighttime dispersion can be fair to excellent, meaning conditions at night can still dilute the smoke reasonably well under typical patterns. This reflects the idea that even after sunset, factors like terrain effects, residual winds, and occasional nocturnal mixing can carry and dilute the plume effectively, preventing excessive accumulation near the burn area. The other statements don’t fit because they suggest consistently poor, unpredictable, or nonexistent dispersion at night, which isn’t the expected outcome for Category 5 under the standard dispersion expectations.