Why do tornadoes rarely appear in the city?

The easy answer to this situation is because cities are too small for an entire landscape, said Joshua Wurman, director of the Center for Special Weather Research in Colorador, USA.

If you look at a map of Google, and see the percentage of area that US cities cover, it will find it a relatively small part. The areas you see at high frequencies - from Texas to Kansas, and even to the east to Atlanta and the southeast, are open countryside, and that's where most tornadoes are. destroyed in most of their life time.

Rarely does a tornado fall into a city, as happened in Atlanta last weekend. In 1999, there was a tornado hit Oklahoma City and killed 40 people. It was a whirlwind that lasted about 1 hour, but most of the time it was in the countryside outside the city.

With tornadoes, it is difficult to predict, or find an association between, the temperature rise in the region and the frequency (or intensity) of their occurrence, because this relationship is unclear. Brazil is quite hot, but there are not many tornadoes. Oklahoma and Texas are very hot in July and August, but that is not their peak period, even more cool spring appears.

A typical tornado match.(Photo: ScientificAmerican)