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SESK: Stuff Everyone Should Know · sesk.info/comm-advection-fog-warm-moist-cold

What kind of fog forms when warm, moist air moves over a cold surface?

Advection fog, and it needs wind.

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  1. Radiation fog
  2. Ice fog
  3. Advection fog ✔

Why: Warm, moist air flowing over a colder surface cools to its dew point and forms advection fog. Unlike radiation fog, it needs wind to form. It is common in coastal areas.

Huh, didn't know that: Radiation fog forms on clear, calm nights and lifts and burns off as the sun rises.

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Why did the fog roll in on a bad day? It was in a mist-erious mood.
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References

Answer: Advection fog. Warm, moist air flowing over a colder surface cools to its dew point and forms advection fog. Unlike radiation fog, it needs wind to form. It is common in coastal areas.

  1. PHAK ch 12, Weather Theory (FAA-H-8083-25C) www.faa.gov/sites/faa.gov/files/14_phak_ch12.pdf
    When a layer of warm, moist air moves over a cold surface, advection fog is likely to occur.
    Checked 2026-10-11.
  2. PHAK ch 12, Weather Theory (FAA-H-8083-25C) www.faa.gov/sites/faa.gov/files/14_phak_ch12.pdf
    radiation fog lifts and eventually burns off.
    Checked 2026-10-11.
  3. PHAK ch 12, Weather Theory (FAA-H-8083-25C) www.faa.gov/sites/faa.gov/files/14_phak_ch12.pdf
    above a speed of 15 knots, the fog usually lifts and forms low stratus clouds.
    Checked 2026-10-11.

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