A Million Green Ideas

Is this why tornadoes are so rare in big cities? Is it something about all the big buildings and congestion? Almost everytime they show a tornado its always in the middle of no where in a corn field somewhere. What causes most big tornadoes to stay away from the city?

Best reply by John C:

The heat dome!

Read the original question on Yahoo! site
Is there something about the urban city environment that helps kill or weaken tornadoes?