SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/pilot-advection-fog-wind

What does advection fog need that radiation fog does not?

Wind, to move moist air over a colder surface.

  1. Clear skies
  2. Wind ✔
  3. Mountains

Why: Advection fog forms when warm, moist air is blown over a colder surface, so it needs wind. It is common along coasts. Above about 15 knots it usually lifts into low stratus clouds.

Huh, didn't know that: Advection and upslope fog may not burn off with the morning sun and can last for days.

The dad joke
What did the beach say when the tide came in? Long time, no sea.
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Sources

  1. FAA Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 12 https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/faa-h-8083-25c.pdf
  2. FAA Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 12 https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/faa-h-8083-25c.pdf

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