It varies. With good visibility, some tornadoes may be visible from over 10 miles away. In other cases a tornado may be completely obscured by rain and may not be visible until it is upon you.
If you can see the tornado
Thus Tuscaloosa-Birmingham tornado of 2011 varied in width, but at its maximum the tornado was about a mile and a half wide.
A a radar is better: it can detect a tornado at a distance. A barometer would be of no use unless the tornado came dangerously close.
The greatest distance a tornado is recorded to have traveled is 219 miles.
No. If there is a tornado the sky will be over cast an you won't be able to see the moon.
Tornado Sirens going off
The average distance traveled by a tornado is about 5 miles.
The longest distance a car has been carried in a tornado is believed to be about 1,307 feet (398 meters), which occurred in the 1991 Andover, Kansas tornado. The car was thrown and carried a considerable distance before landing.
If you can see the tornado
A wedge tornado is a tornado that is very large, usually one that is wider than the distance between the clouds and the ground.
Doppler radar can detect the signature of a tornado from a distance.
Yes. There are hundreds of tornado videos on YouTube.
It is safest to stay underground if you hear/see a tornado.
Thus Tuscaloosa-Birmingham tornado of 2011 varied in width, but at its maximum the tornado was about a mile and a half wide.
When you see a tornado, go into a secure building or if there are none near you, huddle in a nearby ditch.
The longest a tornado is believed to have listed is about three and a half hours. That same tornado also hold the record for distance traveled: 219 miles.
A a radar is better: it can detect a tornado at a distance. A barometer would be of no use unless the tornado came dangerously close.