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| Wall cloud (Murus) | |
|---|---|
 A rain-free base with a wall cloud lowering in the foreground and precipitation in the background. Taken in Needmore, Texas. | |
| Abbreviation | Cb mur. |
| Symbol |  |
| Genus | Cumulonimbus (heap, rain) |
| Species |
|
| Variety | None |
| Altitude | 500-16,000 m (2,000-52,000 ft) |
| Classification | Family C (Low-level) |
| 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 |
A wall cloud (murus[1] or pedestal 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.[2] It is typically beneath the rain-free base (RFB)[3] portion of a thunderstorm, and indicates the area of the strongest updraft within a storm. Rotating wall clouds are an indication of a mesocyclone in a thunderstorm; most strong tornadoes form from these. Many wall clouds do rotate; however, some do not.[4][5]
- ^ Sutherland, Scott (March 23, 2017). "Cloud Atlas leaps into 21st century with 12 new cloud types". The Weather Network. Pelmorex Media. Retrieved 24 March 2017.
- ^ "Definition of Wall Cloud". A Comprehensive Glossary of Weather. Retrieved 2013-01-21.
- ^ Branick, Mike L. (1996). NOAA Technical Memorandum NWS SR-145: A Comprehensive Glossary of Weather Terms for Storm Spotters. National Weather Service. OCLC 39732655.
- ^ Branick, Mike L. (1996). NOAA Technical Memorandum NWS SR-145: A Comprehensive Glossary of Weather Terms for Storm Spotters. National Weather Service. OCLC 39732655.
- ^ Cite error: The named reference
Trainingwas invoked but never defined (see the help page).