The tornado in Moore, suburb of Oklahoma City

Weather conditions in a large part of the US are so impressive... Hurricanes, tornadoes and so on. Some states like Oklahoma are situated in the tornado alley ; where the collision between cool, dry air down from Canada and warm, moist air up from the Gulf of Mexico are likely to happen. It produces a tornado when thunderstom clouds are at the same time in the sky. The wind's speed in this violent rotating column of air was estimated up to 300 mph, could you imagine it....
It is a good idea to have shelters not only in houses but also in public buildings like schools.
Accounts from survivors were so frightening.