A cold air mass and a warm air mass are pushing against each other and not moving. The weather is often cloudy with rain or snow and wind., Cold air mass pushes into warm air mass. Cold air mass lifts up warm air and creates wind and thunderstorms, sometimes even with hail., Warm air mass pushes into a cool air mass. Warm air rises over cool air making clouds and storms., A cold air mass right behind a warm air mass catches up and pushes into the warm air mass. Large clouds form with precipitation.,

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