Mountainous regions, such as the Rockies in the West and the Appalachians in the East, experience a greater number of air- mass thunderstorms than do the Plains states.

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Mountainous regions experience more air- mass thunderstorms due to the orographic lifting of air, which can cause instability and lead to thunderstorm development. In contrast, the Plains states typically experience more severe weather in the form of supercell thunderstorms and tornadoes.

Mountainous Regions, Such as the Rockies in the West and the Appalachians