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A tornado warning is a severe weather warning product issued by regional offices of weather forecasting organizations across the world to advise the public when a tornado is spotted or detected by weather radar within a parent severe thunderstorm. It can be issued when the public, storm chasers, emergency management, or law enforcement have detected a tornado, funnel cloud or rotation in the clouds. It advises that citizens in the impacted regions should take urgent safety steps.
A tornado warning should not be confused with a tornado watch issued by the Storm Prediction Center (SPC) in the United States and by applicable regional forecasting agencies or national severe weather guidance centers in other countries and only indicates that conditions are favorable for tornado formation.