How does a warm front form?
Solution
A warm front forms when a warm air mass moves into an area previously covered by a cooler air mass. Here are the steps:
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Two air masses, one cold and one warm, meet each other. The cold air mass is denser and stays close to the ground, while the warm air mass is less dense and rises above the cold air mass.
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As the warm air mass advances, it slides up and over the cold air mass. This is because warm air is less dense than cold air.
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The warm air cools as it rises, and the water vapor within it condenses to form clouds. This can result in prolonged periods of light rain and cloud cover along the warm front.
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Eventually, the warm air replaces the cold air and the front moves on, leaving warmer temperatures in its wake.
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The boundary where the two air masses meet becomes a 'front'. When warm air replaces cold air, it's called a 'warm front'.
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