Tornado: a rapidly moving vortex of air, which extends from the comulonimbus (thunder) cloud and to the ground. They are more localised than hurricanes, cause more intense damage in a smaller range and are short lived.
Formations: formed where tropical and polar air masses meet (which happens regularly) but also needs heating from the land and moisture in the air. And a large temperature gradient, hence why tornadoes are more likely occur in summer/spring afternoons.
The ACTUAL formation is uncertain, but what is certain is that we know there has to be cold air above warm air, in order to form horizontal spins, it is then drawn up towards the thundercloud.
Case Study:
7th December, 2006
A tornado hit North London, Kensal Rise, only affected a few streets because it was LOCALISED. But within minutes, roofs were ripped off houses, and cars damaged due to falling debris. FORTUNATELY there were no deaths because it happened at lunch time, only a few injuries.
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