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The formation of tornadoes is complicated.
First, you need thunderstorms, then you need 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.
What else can I help you with?
Can a tornado form without clouds?
No. Tornadoes form from thunderstorms. By definition a tornado must make contact with both the ground and the cloud base. However, small whirlwinds, such as dust devils, can form on cloudless days. These look somewhat like tornadoes, but are nowhere near as strong.
What must happen in the atmosphere for a thunderstorm to become a tornado?
A thunderstorm does not become a tornad; it produces one. To start off, in most cases the storm must encounter strong wind shear, or a shift in wind speed and direction with altitude. This sets the storm rotating, turning it into a supercell. If the storm develops in the right manner, a downdraft may descend from the rare portion of the storm and wrap around the mesocyclone, or rotating updraft of the storm. This causes the mesocyclone or a portion of it to tighten and intensify, forming a tornado.
How do tornadoes form in tornadoes?
This best seems to describe a multiple vortex tornado. This is a tornado that has smaller vortices, called suction vortices, circling inside the main vortex. The development of such a tornado is complicated. Let's start with a single vortex tornado. Contrary to popular belief the strongest winds in a tornado are at the edge of the funnel rather than at the center. However, the lowest pressure in a tornado is at the center. While air mostly moves up in a tornado, in some especially strong ones, the low pressure causes a downdraft to move down the center of the tornado. This is a process called vortex breakdown. When this downdraft reaches ground level the air must move outward, but it soon meets the air flowing into the tornado. This interaction creates and area of very strong convergence where the inflow and outflow meet, and some of the tornado's angular momentum gets converted into smaller vortices within the main circulation. These suction vortices create looping swaths of more severe damage within the main damage path.
Why does it hail when there's no tornado outside?
Tornadoes themselves are not the cause of hail, thunderstorms are. In order to produce hail a storm must have a strong updraft to keep hailstones in the air as they form and a fairly large amount of turbulence to create the cycle that forms hail. Tornadoes also need a strong updraft to form but also need other factors such as rotation in the storm to form, but this rotation isn't needed for hail.
What conditions are necessary for a rainbow to occur?
A rainbow occurs when sunlight is refracted, reflected, and dispersed in raindrops, producing a spectrum of light. The necessary conditions for a rainbow to form include sunlight, raindrops, and the observer positioned between the sun and the rain.
What conditions must exist for most fossils to form?
You have to have the dead remains buried quickly and then never distroyed
What two conditions must exist for artesian well to form?
Conditions necessary for an artesian well are an inclined aquifer sandwiched between impervious rock layers above and below
Can a tornado form at 10 miles an hour?
No, tornadoes typically form from thunderstorms with wind speeds of 40 miles per hour or higher. A 10-mile-an-hour wind speed is too weak to generate the necessary conditions for a tornado to develop.
What conditions must exist for a first quadrant solution?
x and y must both be positive.
What conditions must exist in a cell for the cell to engage in fermentation?
Low or no oxygen.
What conditions must exist in order for energy to flow from the atmosphere to earth?
Energy
When must insurable interest exist?
In life insurance it exist at the date on proposal form orat the inception
What elements exist in its pure form but must be derived from compounds?
silver
What two conditions need to exist in order to do work?
In order to do work, two conditions that need to exist are a force must be applied on an object and the object must move in the direction of the applied force. If either of these conditions is not met, work is not being done on the object.
Why aren't some tornadoes created equally?
It all involves the conditions that lead to them forming. To produce a strong, long tornado a thunderstorm must have strong rotation and a strong updraft, and the relative humidity should be fairly high. In order to produce a long-track tornado, the storm must be able to maintain the tornado-producing state. Weak tornadoes form when conditions are less ideal. Some weak, short-lived tornadoes are spin ups that form outside of a larger supporting circulation.
What are the conditions that must exist before performing CPR?
Unconciousness, no respiration and no pulse.For the lay rescuer, the following conditions must exist before performing CPR:Adult: Not breathing and no signs of life (no movement, no breathing).Child / Infant: Not breathing and no pulse.
What are the 3 conditions that must exist when ent or ence are added to the end of words?
The three conditions that must exist when adding "ent" or "ence" to the end of words are: The root word must end in "e." The root word must have a soft c or g sound before the final vowel. The root word must be a complete word on its own.
