This is called a tornado.
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Cumulonimbus clouds appear dark because they are very thick and tall, blocking most of the sunlight from passing through. The more dense the cloud, the less light gets through, making the bottom look dark or gray.
A tornado is a violently rotating and destructive column of air extending from the base of a thunderstorm to the ground.The formation of tornadoes these is complicated.First, a condition called wind shear, in which the speed or direction of the wind changes with altitude. If the shear is strong enough it can essentially tilt a thunderstorm, this separates the updraft and downdraft of the thunderstorm, preventing them from interfering with one another. This allows the storm to become stronger and last longer.Additionally, if the wind shear is strong enough it can start the air rolling in what is called horizontal vorticity. This horizontal vorticity can then be turned vertical by a thunderstorm's updraft. When this happens, the thunderstorm may start rotating. The rotation is especially strong in an updraft called a mesocyclone. If the storm intensifies rapidly enough, a relatively warm downdraft called a rear-flank downdraft or RFD can wrap around the bottom part of the mesocyclone. This can then tighten and intensify its rotation and bring it down to the ground to produce a tornado.
Cumulus clouds can develop into cumulonimbus clouds, which are usually thunderstorms. All thunderstorms contain an updraft, which is a rising air current. Under the right conditions this updraft can start rotating, becoming a mesocyclone. The thunderstorm is now called a supercell. Sometimes the bottom of the mesocyclone can tighten and intensify to produce a tornado.
Tornadoes start up in the clouds & make their way down to touch land.
A tornado has a funnel and is at the bottom of a cumulonimbus cloud. If its winds do not reach the ground, though it is just a funnel cloud.
When a funnel cloud touches the ground, it forms a tornado. Tornadoes are rapidly rotating columns of air that extend from the base of a cumulonimbus cloud to the ground. They can cause significant damage due to their strong winds and intense rotation.
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It forms a funnel cloud.
The stratosphere.
cumulonimbus clouds. They are puffy that appear to rise up from a flat bottom.
Cumulonimbus clouds dissipate at the bottom first because of the downward movement of air known as downdrafts. As the downdrafts descend, they bring dry air from aloft which evaporates the cloud droplets near the base. This process disrupts the updrafts that were sustaining the cloud's vertical development and leads to its dissipation from the bottom up.
The rear caliper compresses into the bore by rotating the face clockwise. You can do this with a special tool or with long, needle nose pliers. Unlike the front calipers, the piston extends and retracts on a spiral screw attached to the bottom of the caliper bore.
Such a storm is called a tornado.
The bottom of a whirlpool is called the vortex. It is the central region where water spirals downward into a rotating mass.
There are usually 2 rotating wash arms, top and bottom.
A supercell is a powerful thunderstorm with a strong, rotating updraft called a mesocyclone. They don't so much develop into tornadoes as they produce them. How they do this is not fully understood, but it is believed that moist of the time a downdraft called a rear-flank downdraft or RFD wraps around the bottom part of the mesocyclone, tightening and intensifying it to form a tornado.