It varies, but it will always occur during a thunderstorm. If that area of the storm is not obscured by rain or the dark of night you will usually see a rotating block of clouds lowered from the main cloud base called a wall cloud. Near this a downdraft will blast a hole in the clouds. Not long afterwards there will likely be strong winds. Then the funnel begins to lower from the wall cloud and a swirl of dust or debris may appear on the ground below it as the tornado connects to the ground.
This depends on how powerful the tornado was.
Tornadoes often form in a type of cumulonimbus cloud called a wall cloud. Look up what a cumulonimbus cloud looks like on Google images.
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.
The eye of a tornado is extremely calm and bears no resemblence to all the mayhem that the tornado causes to the outside world.
Not generally. Tornadoes can only form from thunderstorms. However, many tornadoes do form near the edge of a thunderstorm and in some cases the ground level circulation of the tornado can drift out from under the storm base, even though the tornado still connects to the parent storm. There are some whirlwinds, namely dust devils, that form on clear days and look like tornado. But these whirlwinds are not actual tornadoes.
A tornado
This depends on how powerful the tornado was.
Tornadoes often form in a type of cumulonimbus cloud called a wall cloud. Look up what a cumulonimbus cloud looks like on Google images.
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.
No. A tornado is defined as a violently rotating column of air. A tornado can form on a body of water, in which case it is called a waterspout. Some water can get pulled up into it, but it is still primarily a vortex of air. Whirlpools, vortices that form in water, can look like tornadoes, but are not the same thing.
A dust devil resembles a tornado on some levels, but is not as strong and does not form from a thunderstorm.
It would depend on the severity of the tornado.
A tornado drill is like a fire drill but for tornadoes: practice for the possibility of a tornado. A tornado warning means that a tornado has been detected or is likely to form soon.
The eye of a tornado is extremely calm and bears no resemblence to all the mayhem that the tornado causes to the outside world.
a funnel
A sand tornado is not a true tornado but a phenomenon called a dust devil. A dust devil takes for form of a whirling cloud of dust as dust is sucked up by the vortex. It may appear tubelike and gradually fades into nothing farther up.
A tornado looks either looks tall and skiny, short and fat,or medium sized.