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A cold front forms. The warm, moist air, which is less dense, gets forced upwards. As it rises it cools and the moisture in it condenses. This results in rain and possibly thunderstorms.

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Q: When cold air moves in and warm moist air meet what happens?
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Where warm and cold air meet?

They meet at a front.


Why Newfoundland has thick fog all the year around?

Because two ocean currents meet- the cold Labrador Current and the warm Gulf Stream. The associated airmasses mix- warm air from Gulf Stream is warm and moist, Labrador cold, so the moisture in the warm air cools and condenses.


What happens when a cold front hits a warm front?

When a warm front and cold front meet the cool air rises above the warm air which creates lift which causes the moist air parcels to rise into the atmosphere. Then they condense into water droplets and form clouds those clouds will then form into thunderstorms which when the water molecules get heavy enough will fall as rain and then the water molecules and air molecules bounce off each other create the lightning you get with thunderstorms and that lightning creates a sonic boom which is the thunder. So basically a warm front and cold front colliding create thunderstorms which if the atmosphere supports it can potentially produce thunderstorms that produce tornadoes.


What does the warm humid air do when they meet cold dry air during a tornado?

The meeting of warm, humid air and cool, dry air is not the direct cause of tornadoes. The boundary where these air masses meet is called a cold front, as the cooler air mass is advancing. Cool, dry air is denser than warm, moist air. As a result, the cooler air mass acts as a wedge, forcing the warm, moist air upward. As the warm air rises it cools and the moisture in it condense. If it is unstable enough, this will lead to the formation of thunderstorms. If a few other conditions are right, these storms may go on to produce tornadoes.


What will happen when a high pressure and low pressure system meet?

When a warm air mass and a cold air mass collide, you get a front. Remember how low-pressure warm air rises and cold high-pressure air moves into its place? The same reaction happens here, except the two forces slam into each other. The cold air forms a wedge underneath the warm air, allowing it to basically ride up into the troposphere on its back and generate rain clouds. The two winds converge and rise together in an updraft that often leads to cloud formation.