When a tornado is possible: a) a tornado watch is issued.
A tornado is a violently spiraling narrow column of air that extends from a thunderstorm to the ground, wreaking havoc and destroying life and property on its path.
A Tornado Watch is issued by meteorologists (the Storm Prediction Centre in the US), to indicate the likelihood of tornadoes occurring, though they may not necessarily occur. They only point out that favorable conditions for formation of tornadoes are present.
A Tornado Warning is a higher level alert than a Tornado Watch, and is issued when tornadoes are spotted or detected by radar. It indicates serious threat to life, property and infrastructure in the area covered by the watch.
To learn more about Tornadoes: https://brainly.com/question/2903842
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