Hi everybody Today's weather is very nurse, and heavy winds all day. I heard about terrible tornado in USA somedays ago. When i saw it through TV news, it's really terrible and harmful to everything. It destroyed everything on her way for example, houses, trees,... I newly know about some tools to indicating tornado's occurrence. It looks like a pager. It catch a tornado's special sound wave, and alrming through a pager. But i think it's not a real solution to preparing tornado's attack. But nowadays, there are no other choice. I think tornado is a real natural power to human. Anyway, have nice weekend.