A tornado warning is an alert issued by national weather forecasting agencies to warn the public that severe thunderstorms with tornadoes are imminent or occurring. It can be issued after a tornado, funnel cloud and rotation in the clouds has been spotted by the public, storm chasers, emergency management or law enforcement. When this happens, the tornado sirens may sound in that area if any sirens are present, informing people that a tornado has been sighted or may be forming nearby. The issuan