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No, the wall cloud is a lowered section of the cloud base from which a tornado or funnel cloud descends. The dark cloud at the base of a tornado is called the debris cloud.
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The wall cloud is a large section of cloud extending down from the base of a thunderstorm. The wall cloud marke the strongest part of the mesocyclone, which is the rotating updraft that can produce a tornado. A funnel cloud or tornado usually extends from the base of a wall cloud.
cirrocumulus
The funnel cloud.
Wall cloud.
A tornado usually emerges from a wall cloud, which is at the base of a cumulonimbus cloud.
Nothing special. All tornadoes stretch from cloud base to the ground. If the vortex doesn't reach cloud base or the ground it isn't a tornado.
Signs of a potential tornado include rotation in the clouds, a persistent lowering of the cloud base, and a hole opening up in the clouds near the back of a storm (these are all potential precursors). Other signs include a funnel or con shaped extension of the cloud base, and swirling debris on the ground, indicating that a tornado or funnel cloud has formed.
At the cloud base when water vapor begins condensing it begins to release it. This releasing is called rain.
Signs of tornadic activity usually start with a wall cloud, which is attached to the base of a cumulonimbus cloud.
Cloud Ceiling is the height of the lowest cloud in the sky covering more than half the sky (BKN, OVC)