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Air is being pulled upward int a rotating vortex with a low pressure center. The low pressure produces a temperature drop, causing moisture in the air to condense.
There are two main factors. First, moisture in the air condenses as a result of decompression inside a tornado, producing the visible funnel cloud. Second, a tornado's winds lift dirt and debris into the air, forming a debris cloud or dust whirl
fog or mist!well DER peopleNa....Tha real answer scientifically is that Fog is a Stratus cloud that forms near the ground..
fog
A wall cloud forms when the rotating updraft of a supercell thunderstorm, called a mesocyclone, draws in moist air and causes the moisture to condense. The wall cloud marks the strongest part of the mesocyclone.
A tornadic vortex that is developing but has not yet reached the ground is called a funnel cloud.
When the water vapour has condensed in the air forming cloud
The air will simply spread out in space, eventually forming an extremely diffuse cloud.
It depends on the temperature of the air around the cloud. A cumulus cloud is formed by warm air rising into a layer of cooler air, so the base of the cloud will be warmer and the air will get colder toward the top of the cloud. If water vapor condenses out of the air as it rises in the cloud, this will warm up the air in the middle of the cloud.
fog
funnel cloud
For clouds to form the air has to be unstable, meaning that the air at the surface is warmer than the air above. So when the air rises it hits a level called the Lifting Condensation Level. If the air rises to this point it then can start to condense on particles in the sky forming clouds.
Cloud
continental air masses
That is called: "Precipitation"
Depression's bring cloud and rain because warm air meets cold air and its called a 'front'. Along the front there will be cloud and then sometimes rain.
fog or mist