Thunderstorms form when the three required atmospheric conditions of sufficient moisture, unstable air and a lifting mechanism are present. In the United States, thunderstorms are most common in the spring and summer mon... More »

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Thunderstorms are formed by the combination of three main ingredients: moisture, unstable atmospheric air and an external acting force making the damp and volatile air rise upward. Thunderstorms come in several different... More »

Thunderstorms cause hail when strong winds push raindrops upward into the atmosphere where the extremely cold air supercools the water and causes it to freeze into spheres of ice. This can occur several times, with balls... More »

Tornadoes form out of thunderstorms, where moist air rises, cools and condenses into clouds that release heat and force cooler air back down. If the updrafts are strong enough, the feedback loop forms an air vortex that ... More »

Most tornadoes are created as a result of thunderstorms that form at the meeting point between humid air from the Gulf of Mexico and dry, cooler air from Canada. At that point, instability occurs in the atmosphere, and a... More »

Hurricanes are massive storms made out of an organized series of thunderstorms that form over the ocean. Typhoons are the same as hurricanes, except they occur in a different part of the world. Tornadoes are smaller stor... More »

Hurricanes form when rising warm, moist air displaces colder air high in the atmosphere. The cold air drops down on all sides of the warm spot, swirling slightly as it falls, then becomes warm and moist itself, repeating... More »

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