The force of a tornado comes form a turning, rising mass of air in a thunderstorm called a mesocyclone. Sometimes a downward-moving wind called a downdraft can wrap around the mesocyclone and make it narrower, which causes it to spin faster.
Most tornadoes develop from a larger but less violent circulation in a thunderstorm called a mesocyclone. Under the right conditions a downdraft may wrap around the mesocyclone and cause it to tighten and intensify and can bring that circulation to the ground in the process.
It usually requires a special kind of thunderstorm called a supercell. These storms have a powerful, rotating updraft called a mesocyclone. It is believed that if a mesocyclone intensifies rapidly it creates a downdraft, called a read-flank downdraft or RFD, near the back of the storm. This downdraft wraps around the bottom portion of the mesocyclone, tightening ans intensifying the rotation to produce a tornado. RFD winds can be very strong, sometimes exceeding 100 mph (160 km/h).
For the most part a tornado is actually an updraft as it is connected with the rotating updraft of its parent thunderstorm. However there are two downdrafts that are related to tornadoes. The first is the rear-flank downdraft of a thunderstorm. This downdraft is induced by rain and wraps around the rotating updraft of a supercell thunderstorm. This is believed to tighten and intensify the mesocyclone to produce a tornado. Another, less common downdraft occurs when a tornado undergoes something called vortex breakdown. The center of a tornado has low pressure, which draws air inward and upward, but in a very intense tornado the air is spinning so fast that it cannot reach the center so the low pressure draws air downward, forming a downdraft in the center of the tornado. This is a similar mechanism to what produced they eye of a hurricane.
When you run a ceiling fan counterclockwise, it creates a downdraft. This downdraft creates a wind chill effect on your skin, making you feel cooler. Additionally, counterclockwise rotation can help to circulate air in the room, keeping the air fresh and preventing stagnation.
a downdraft is air that goes down-the air gets colder and it sinks
It depends. It is an updraft in most tornadoes, but in some tornadoes there is a downdraft at the center much like that in the eye of a hurricane.
downdraft
how to clean downdraft air vents Impossible to bring up the answers on your site. Extremely frustrating.
No. There is a possibility, no matter how remote, that flame from the cooktop could enter the downdraft opening. If there's a gas line in there, bad things will happen, need I say more?
yes
No. Its is the other way around. Thunderstorms usually dissipated when the downdraft overpowers the updraft. The updraft is what drives a thunderstorm.
the hailstone starts as snow, an updraft of warm air and a downdraft of old air causes the hailstone to form. it falls to the ground
The advantages to an electric downdraft cooktop versus an electric one is that the way the draft of the aroma from the foods you are cooking is dispersed.
The advantages of an electric downdraft cooktop is that it is very much more convenient. This type of cooktop would be easier to use than the regular kinds out there.
Downdraft cooktops can be purchased as gas or electric, or combination models. They are available from Sears Outlet, Best Buy, Walmart, Home Depot, GE Applicances and eBay, though they should befitted by a qualified gas fitter or electrician.
An electric downdraft cooktop is a step up from your traditional cooking options. Luckily national chains, such as Sears, Loews and Home Depot carry them.