Joplin was under a tornado warning for about 17 minutes before the tornado formed and 19 minutes before it entered the city.
Partially. A tornado warning means that a tornado is likely to form or already has formed.
Sort of. A tornado warning means that either a tornado has already formed or may form very soon.
Severe thunderstorms have the potential of producing a tornado with little or no advanced tornado warning.
No. A tornado warning means that a tornado is likely to form or has already been spotted.
"The tornado warning scared you." is active voice. "You were scared by the tornado warning." is passive voice.
As of May 16, 2012 the last tornado was two days ago.
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.
Tornado warning
A tornado warning is a higher level of alert, often meaning that a tornado has formed.
A tornado warning is an advisory that is issued when a tornado has either been spotted or detected or that a thunderstorm in the area is likely to produce a tornado soon.
When a tornado warning means that a tornado has been spotted or detected or if a thunderstorm may produce a tornado at any moment.