Tornado warning

A tornado warning is issued when:

a tornado is reported on the ground,
a funnel cloud is reported in the sky,
a waterspout is headed toward landfall, or
a thunderstorm with strong rotation is indicated by doppler radar.

A tornado warning means there is IMMEDIATE DANGER for the warned area -- if not from the relatively narrow tornado itself, from the severe thunderstorm producing (or likely to produce) it. EVERYONE in the path of such a storm should TAKE COVER IMMEDIATELY, as it is likely a LIFE-THREATENING SITUATION.

In the United States, the National Weather Service issues warnings for tornados and severe thunderstorms on a per-county basis.

A warning must not be confused with a tornado watch.

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Tornado warning