Wall cloud
A wall cloud is a large, localized, persistent, and often abrupt lowering of cloud that develops beneath the surrounding base of a cumulonimbus cloud and from which tornadoes sometimes form. Wikipedia
Abbreviation: Cb mur
Altitude: 500-16,000 m; (2,000-52,000 ft)
Appearance: A dark cloud feature that protrudes from the base of a cumulonimbus more popularly known as a wall cloud
Precipitation: Very common nearby, but not under: Rain, Snow, Snow pellets or Hail, heavy at times
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A wall cloud is an isolated cloud lowering attached to the rain-free base of the thunderstorm. The wall cloud is usually to the rear of the visible ...