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If a tornado has been detected or spotted then a tornado warning is issued.
If a tornado is spotted a tornado warning is issued.
Tornado warning
The first tornado warning was issued on March 20, 1948 for a storm that produced a tornado in the Oklahoma City area.
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Such a thing is impossible to predict. A tornado warning itself is a prediction that the threat of a tornado is imminent. As soon as signs indicate that a tornado warning is warranted, then one is issued. So there is no way of nowing when a tornado warning is going to be issued until it actually happens.
Warning
have warning labels
It varies quite a bit. The average warning time is about 15 minutes.
a tornado warning would be issued if it is in your county and a tornado watch if it is out of your county.
Under these circumstances a tornado warning would be issued.