We can infer that the motions of air masses in the area have a tendency to create a new weather condition.
Its refers to the volume of air which is defined by its temperature and water vapor content.
When air masses are moved by winds, they have tendecies to create a weather conditions such as heat, cold, dry or moist.
In conclusion, a typical severe storm are created by an air mass when they reaches a new region and clashes with other air mass that has a different temperature and humidity.
Note: The question is incomplete, that the reason i explained what is air mass and its effects.
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