Once formed, a tornado will reach maximum intensity fairly quickly. Weaker and stronger phases may alternate and the funnel cloud may lift briefly or change in diameter. At peak intensity, you will usually see a dark mass of debris at the base of the tornado, with the debris revolving upward in a tightly controlled fashion. Low, wide tornadoes can be spread out,with several apparent contact points or separate vortices within a broad circular region which show both debris and condensing cloud matter mixing as they ascend. In the waning stage,the tornado lifts and becomes thinner.
Debris decreases suddenly and become diffuse or spreads out horizontally.
The condensation funnel shrinks upward and becomes twisted, curved, or less vertical in orientation. It continues to shrivel in this rope stage until it vanishes or retracts into the cloud base. The wall cloud also loses structure and size but may rebuild again in a while. W. Their motion is, therefore, reasonably slow and predictable. Tornadoes are highly organized and quite well-behaved structures, and there are rarely any sudden changes or surprises in the direction of movement.