In the back wall of a thunderstorm, there is an area of low pressure which starts to rotate. Sometimes, this rotation is fast, and speeds up rapidly. While rotating, the cloud forms a cyclone and the cyclone sucks up dirt, debris and gains in windspeed. Once this small cyclone touches the ground, it turns into a tornado. A tornado is very destructive and can devastate an area in a short period of time. The destructive force of a tornado is measured from a scale of F1-F5.
a violent whirling wind specifically a tempest distinguished by a rapid whirling and slow progressive motion usually accompaned with severe thunder lightning and torrents of rain and commonly of short duration and small breadth a small cyclone.
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