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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 precipitation area. A condensation funnel is made up of water droplets and extends downward from the base of the thunderstorm. More @Wikipedia
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- Weather Spotter’s Field Guide - Tornado Life cycleThere is nothing overly special about a visible funnel. The funnel forms as moisture condenses due to decreasing pressure in the tornado's vortex. Therefore, with insufficient moisture, a visible funnel may not extend all the way to the ground and still have a mature tornado.
- What Causes Cold Air Funnels? - National Weather ServiceThe funnels are most common in the fall and spring when the sun is able to heat up the lower levels of the atmosphere, causing convection to bubble up and form showers, but temperatures around 15,000 to 20,000 feet above the ground are quite cold.
- Severe Weather 101: Tornado Basics - NOAA National Severe Storms LaboratoryIf it is in contact with the ground it is a tornado; otherwise it is a funnel cloud. Dust and debris beneath the condensation funnel confirm a tornado's presence. Be careful! Tornadoes can form and be in contact with the ground without a fully condensed funnel!
- Funnel cloud - WikipediaFunnel clouds result from the low air pressures found within tornadoes. The low air pressure causes air flowing towards the vortex to expand and cool. If the air is sufficiently moist and cools to the dew point, a funnel cloud is produced.
- Funnel clouds - Met OfficeA funnel cloud is a cone-shaped cloud which extends from the base of a cloud towards the ground without actually reaching the surface. In the UK they often look like thin dangling bits of rope,...
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