What are some clues that a tornado may be ready to hit?

Answer 1

Large hail and a greenish colored sky are often a sign of the type of thunderstorm that can produce a tornado. More imminent signs include rotation in the clouds with a lowering of the cloud base and a hole in the clouds near it which is often accompanied by strong winds.

Answer 2

Some clues that a tornado may be ready to hit include a dark or greenish sky, a loud roaring sound similar to a freight train, large hail, a low-lying rotating cloud, and sudden changes in wind direction or speed. If you notice these signs, seek shelter immediately.