Air Pressure and Fronts. Air Pressure Air has weight, and is in constant motion and is pulled...
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Transcript of Air Pressure and Fronts. Air Pressure Air has weight, and is in constant motion and is pulled...
![Page 1: Air Pressure and Fronts. Air Pressure Air has weight, and is in constant motion and is pulled towards Earth’s center by gravity. Air pressure is greatest.](https://reader035.fdocuments.us/reader035/viewer/2022062600/5a4d1b527f8b9ab0599a80cc/html5/thumbnails/1.jpg)
Air Pressure and Fronts
![Page 2: Air Pressure and Fronts. Air Pressure Air has weight, and is in constant motion and is pulled towards Earth’s center by gravity. Air pressure is greatest.](https://reader035.fdocuments.us/reader035/viewer/2022062600/5a4d1b527f8b9ab0599a80cc/html5/thumbnails/2.jpg)
Air Pressure• Air has weight, and is in constant
motion and is pulled towards Earth’s center by gravity.
• Air pressure is greatest at the Earth’s surface and decreases with increased altitude.
• Higher air pressure near the ground.
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What instrument is used to measure air pressure?
• Barometer measures air pressure.• High pressure indicates Dry Air• Low pressure indicates Moist air
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FrontsFronts occur where two large air
masses collide at the earth’s surface. Each air mass has a different temperature associated with it.
In the US, air masses usually travel west to east.
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Types of Air Masses
• Continental Polar• Maritime Polar• Maritime Tropical• Continental Tropical
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• Air masses do not usually mix. The boundary between colliding air masses is called a front.
• Fronts are usually associated with some form of precipitation.
• Thunderstorms, tornadoes, and other severe weather can occur with fronts.
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Four types of fronts
1. Cold Front2. Warm Front3. Stationary Front4. Occluded Front
Why are there no fronts in the Tropics?There are no cold air masses, just warm air.
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Cold Front
• Heavy cold air displaces lighter warm air, pushing it upward. • Cumulus clouds.• Thunderstorms occur. • Temperatures drop5 to 15 degrees. • Winds are gusty. • Rain, snow, sleet, and hail can occur.
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COLD FRONT
![Page 12: Air Pressure and Fronts. Air Pressure Air has weight, and is in constant motion and is pulled towards Earth’s center by gravity. Air pressure is greatest.](https://reader035.fdocuments.us/reader035/viewer/2022062600/5a4d1b527f8b9ab0599a80cc/html5/thumbnails/12.jpg)
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Warm Front
• Warm fronts occur when warm air replaces cold air by sliding over it.
• Altocumulus clouds form• Less chance of rain, snow, or sleet.• Temperatures may increase.• Winds are usually gentle.
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Warm Front
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Stationary Front
• Neither warm nor cold air advances. Neither front is moving.
• Lasts for days. Lots of clouds• Temperatures remain the same.• Gentle or no wind.
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Occluded Front
• Fast-moving cold air mass overtakes a slower-moving cold air mass and forces it up.
• Cool temperatures and large amounts of precipitation.
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