Requirements MET

For a thunderstorm to form, three things must always be present: an unstable layer (so the air can continue to rise and develop the cloud), a large moisture supply/high humidity (so there is plenty of water vapour to form the cloud and provide the latent heat from condensation to "power" the cloud upwards) and finally a trigger action to get the air moving upwards in the first place so that the condensation process can begin.

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What are the requirements, at low level, for a thunderstorm to form?