High-pressure cells stagnate in these areas most of the year. The air is warm because of the low latitude and can hold considerable moisture. It is essentially an oceanic belt that is extremely warm and that has a high moisture content. Convergence of the trade winds from both hemispheres and the intense insolation over this region causes lifting of the unstable, moist air to high levels. The weather associated with these conditions is characterized by thunderstorms throughout the year.
Superior air is a high-level air mass found over the south central United States.
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