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A small spread between temperature and dewpoint most directly indicates the possibility of what?
Choices
✓ Fog or low clouds formingcorrect
When temperature and dewpoint are close, the air is near saturation and fog or low clouds are likely.
Clear skies and unlimited visibility
A small spread signals saturation and reduced visibility, not clear skies.
Strong high-altitude winds
The temperature/dewpoint spread does not indicate high-altitude wind speed.
Rising density altitude
Density altitude is driven by heat, altitude, and humidity, not the spread by itself.
Why
The dewpoint is the temperature at which air becomes saturated. A small temperature/dewpoint spread means the air is near saturation, favoring fog and low clouds.
FAA source: Aviation Weather Handbook FAA-H-8083-28 / PHAK Ch. 12browse the reference library →
Original study question written for this course — representative of FAA knowledge-test topics, not an actual current FAA exam question.