Learn vocabulary, terms, and more with flashcards, games, and other study tools. Rising ground forcing the air upwards (orographic uplift). From there, it advances in activity until it reaches its peak at the mature stage. Stage 2: The warm air meets very cold air in the middle levels of the atmosphere. If this warm surface air is forced to rise -- … Severe Thunderstorms. This diagram sequence shows the stages in the development of a thunderstorm: Stage 1: Warm moist air is forced upwards, forming a cumulus cloud. Thunderstorms form and die out within the storm. The sun heats the surface of the earth, which warms the air above it. All thunderstorms start with moisture and rising warm air. The air must be warm and moist. Cells continue to form within the clouds as the multicell storm regenerates itself. A trigger mechanism must cause the warm moist air to rise: Heating of the layer of air close to the surface. When a thunderstorm begins to form, it does so at the cumulus stage. Three basic ingredients are required for a thunderstorm to form: moisture, rising unstable air (air that keeps rising when given a nudge), and a lifting mechanism to provide the "nudge." A total of thirty or more cells may develop during the lifetime of a storm. Thundersnow usually forms when layers of flat snow clouds develop instability and experience dynamic lifting. Storms form when warm, moisture-laden air rises rapidly into the atmosphere. A typical normal thunderstorm consists of tall, narrow clouds that rise from a warm updraft leading from the surface up to around 40,000 feet. This typically occurs on a warm summer’s day when the longer hours of sunshine have heated the ground. The warm, moist air immediately above the ground is less dense than the cooler, … Some of the most violent aspects of thunderstorms … Start studying How does a thunderstorm form?. Thunderstorms can form in winter, but they have different characteristics. How a thunderstorm forms Next. 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