Tornado watch
A tornado watch (SAME code: TOA) is a statement issued by weather forecasting agencies to advise the public that atmospheric conditions in a given region may lead to the development of tornadoes within (or near) the region over a period of several hours. In addition to the potential for tornado development, thunderstorms that develop within the watch area may contain large hail, strong straight-line winds, and intense rainfall and/or flooding, all of which may pose a similar damage risk as the attendant tornado threat.