Storms that form at an occluded front are commonly short-lived because the warm air mass is cut off from its supply of moisture evaporating from Earth's surface.

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When a warm front is forced aloft by a cold front, it creates an occluded front. The warm air mass is cut off from the surface, which means that it is unable to produce enough moisture to fuel the storm. This lack of moisture causes the storm to dissipate quickly. Therefore, storms that form at an occluded front are commonly short-lived.

Storms That Form at an Occluded Front Are Commonly Short-Lived