Drizzle
(Section 3.2.1.2.3)Definition: Drizzle: Fairly uniform precipitation of very fine drops of water very close to one another that falls from a cloud.
Drizzle drops have a diameter of usually less than 0.5 mm. The drops appear almost to float, and so make even slight movements of the air visible .
Drizzle falls from a layer of Stratus, usually low, sometimes touching the ground (fog).
The amount of precipitation in the form of drizzle can be considerable (up to 1 mm/h ), especially along coasts and in mountainous areas.
The drops falling on the edge of a rain zone or during light rainfall may be as small as drizzle drops, owing to their partial evaporation. In this situation, raindrops are distinguished from drizzle drops in that they are more scattered.
Identification of the precipitating cloud as Stratus also distinguishes rain from drizzle.