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Tornadoes occur in all season but are most common in spring and early summer. At this time there are frequent collisions between warm, moist air masses and cooler and/or dryer ones that can trigger thunderstorms. Additionally, at this time of year the lower atmosphere is warming faster than the upper atmosphere, creating instability that supports thunderstorms. Finally, strong upper level winds left over from winter create wind shear which gives thunderstorms the rotation they need to produce tornadoes.

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