A Tornado basically looks like a grey cone, but it moves on it's "tip". On top of the tornado, there is usually dark grey clouds. Some tornado's can be skinny and some can be fat. It is usually very, very, very windy when your are somewhere close to the tornado. There may be rain when a tornado is close to your area since tornado's are formed by hot and cold air (ithink..).
A tornado can take various shapes but often takes the appearance of a funnel, cone, or rope expending from the clouds, often with a cloud of swirling dust and debris at the ground. As a tornado approaches the wind speed will increase and you will feel your ears pop as the pressure drops. The air inside the tornado will feel cool and wet. In a weak tornado the wind will make it difficult to stand. A stronger tornado would be able to pick you off the ground. Since the wind is likely to be laden with dust the experience would likely be painful even if you were not picked up or struck by debris.
There can be, but it is not a requirement for one. Search google for tornado lightning and look through the images to see.
A Vacuum Cleaner is similar to a tornado because a vacuum cleaner sucks things up as does a tornado. Some people might say a tornado is God's vacuum cleaner.
Wikipedia's article on the Fujita scale provides a good table with pictures of the damage at each level.
Meteorologists and engineers look at the aftermath to determine the intensity of the winds. It is possible to get a rough idea of how strong a tornado is by how fast its rotating.
A tornado consists of a vortex in which air spirals inward and then upward. The tornado itself moves forward, usually along a relatively straight path.
Scary
A tornado
This depends on how powerful the tornado was.
A tornado is not a solid thing that you can touch, it is a vortex of very fast wind.
It would depend on the severity of the tornado.
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 tornado looks either looks tall and skiny, short and fat,or medium sized.
Without a funnel, a tornado will likely appear as a whirling cloud of dust or debris. If there is not enough of that present, then the tornado will be invisible.
Asia , i am guessing
Suction vorticies as smaller columns of rotating air within a tornado. They have more intense winds than the rest of the tornado. The suction vortices sometimes look like "mini tornadoes" moving around inside the main circulation.
Tornadoes come in different shapes, and the shape changes during the life of the tornado. Some tornadoes are like thin tubes or ropes, some look like large wedges. If it is wrapped in rain, or there isn't enough light, it can be hard to see a tornado. Sometimes clouds may look like a tornado but aren't, so looking for other clues like rotation is important.