![]() As they continue to move up, they gather mass - until they are so heavy that they start to fall.As they move beyond zero degrees, water droplets change into small ice crystals.The heat (latent heat of condensation) generated in the process pushes the water molecules further up.As water vapour moves upward in the cumulonimbus cloud, decreasing temperatures causes it to condense.Most large and violent tornadoes come from super-cells.A super-cell is a long-lived (greater than 1 hour) and highly organized storm feeding off an updraft (a rising current of air) that is tilted and rotating.Multi-cell storms may produce hail, strong winds, brief tornadoes, and/or flooding.Individual cells usually last 30 to 60 minutes, while the system as a whole may last for many hours. ![]()
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