a siren
Not really. Although there were some attempts at warnings during that general time period, no warnings were issued for the Waco tornado, largely due to failures in communication. The Waco tornado served as a catalyst to develop a warning system.
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.
Tornado warning
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.
A tornado warning is a higher level of alert, often meaning that a tornado has formed.
The most advanced tornado warning system belongs to the U.S. Doppler radar scans the wind an rain inside thunderstorms, which allows meteorologists to see if there is rotation in a storm which can produce a tornado. Weather spotters, firefighters, and police can report sightings of rotation in the clouds, funnel clouds, and tornadoes that touch down. If a tornado is spotted or is likely to form soon, then a tornado warning is issued. The warning will be broadcast over TV, radio, the internet, and smartphone apps. In some towns loud sirens will sound if a tornado warning is issued.
When a tornado warning means that a tornado has been spotted or detected or if a thunderstorm may produce a tornado at any moment.
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.