Advection Dew
(Section 3.2.1.4.2)Definition: Advection Dew: Deposit of water drops on objects whose surface is sufficiently cold to cause direct condensation of the water vapour coming into contact with this surface through advection.
Advection dew is deposited mainly on vertical, exposed surfaces. It is observed when relatively warm, damp air suddenly invades a region where the temperature of the exposed surfaces is lower than the dewpoint of the advected air. Advection dew must not be confused with deposition of fog droplets, or with the pseudo-dew observed in humid weather on exposed surfaces (such as roads) when covered by a thin film of hygroscopic substances.