Cumulus humilis

(Section 2.5.2.9.1)

Below the cloud. Viewed from below, this cloud usually has a horizontal base. Turbulence is generally moderate.

Within the cloud. Cumulus humilis is composed of water droplets (sometimes supercooled). An observer flying through it has the impression of being in dense fog, with large variations in visibility. Ascending currents of about 2–5 m/s (7–17 ft/s) may be encountered. Turbulence is sometimes severe, especially during the formation and growth of the cloud, and it diminishes when the cloud is mature.

Above the cloud. Viewed from above, this cloud often appears to be floating in a hazy layer from which its rounded tops emerge. Most of the tops extend to nearly the same level. The individual clouds may be widely spaced, or they may be close together and sufficiently flat to resemble patches of Stratocumulus. There is usually no turbulence above Cumulus humilis.