Surviving Tornadoes
The color of the sky usually turns greenish and dark before a severe thunderstorm.
Tornado winds can easily rip off roofs, and they are most attracted to right angles. Conventional homes have roofs that overhang over the house frame. The gap between the roof and house is where the winds can get hold of and literally tear the roof off. For this reason, it is best to leave your home and go to a designated shelter in your city.