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Evaporation.
Clouds form when warm, humid air rises and cools to it's dew point.
Condensation by warm air
Not necessarily. A collision of warm and cold air will often produce thunderstorms, but other conditions are needed for those storms to produce tornadoes. Additionally, tornadoes can form from thunderstorms produced by other circumstances.
No single air mass "causes" tornadoes. This is Tornadoes form within thunderstorms. Thunderstorms form best when there is plentiful warm, moist air. So, a arm, moist air mass is usually present. Significant tornado activity, however, usually results from the thunderstorms that form near the boundaries between air masses. Usually where a warm, moist air mass meets a cooler or drier air mass.
unstable environment
unstable environment
Evaporation.
Thunderstorms occur when there is warm air that rises. This air must also be damp or moisturized. Therefore, areas that are warm and humid are usually where thunderstorms occur. (These places are most commonly found around the equator)
In simplest terms, thunderstorms get their energy from warm, moist air. The warmer and more humid the air, the more energy is available.
Cold front. When the cold air collides with warm, moist air, the humid air is forced up violently and forms thunderstorms.
Warm, humid air which rises in an unstable environment. Often, this happens as a cold front sweeps into a warm, humid region, driving up the warm, moist air into a region where it quickly condenses due to temperature and pressure changes.
In order for thunderstorms to form the air must be unstable, which generally requires the air near the ground to be warm and moist. This warm, moist air provides the energy that powers thunderstorms. The warmer and more humid the air is, the more energy is available for thunderstorms.
A period of warm, humid weather usually ends in thunderstorms in the UK.
Thunderstorms are most likely to form when the air is warm and humid.
The warm air over the Earth's surface rises and pushes the clouds higher.
they are likely to develop at warm humid areas.