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"LMS Ch 24.1 DR

"LMS Ch 24.1 Directed Reading

Differences in are caused by unequal heating of Earth’s surface. air pressure
The region along the receives more solar energy than the polar regions do. equator
Heated equatorial air rises and creates a belt of _______________ . low pressure
Cold air near the poles sinks and creates a belt of _________________ high pressure
Differences in air pressure at various locations on Earth create ______________ wind patterns
Air moves from areas of high pressure to areas of low pressure.
There is a general world-wide movement of air from the poles toward the equator.
What happens to air when the air pressure differences are small? When air pressure differences are small, air remains relatively stationary. It then takes on the characteristic temperature and humidity of the region.
What is an air mass? An air mass is a large body of air throughout which temperature and moisture content are similar.
What are the characteristics of air masses that form over polar areas? They are very cold and dry.
What are the characteristics of air masses that form over tropical oceans? They are moist and warm.
Air masses are categorized according to their source region.
Cold air masses come from polar areas.
Warm air masses come from tropical areas.
What are air masses that form over the ocean called? maritime
Air masses that form over land are called continental.
Name three large land masses over which continental air masses form. northern Canada, northern Asia, and the southwestern United States
What weather conditions do continental land masses generally bring when they move into a region? They generally bring dry weather.
Name and describe the two types of continental air masses. Continental polar (cP) air masses are cold and dry. Continental tropical (cT) air masses are warm and dry.
How do air masses that form over the ocean differ from continental air masses? The humidity in these air masses tends to be higher than that of continental air masses.
What weather conditions do maritime air masses generally bring when they travel to a new location? They bring precipitation and fog.
Name and describe the two types of maritime air masses. Maritime polar (mP) air masses are moist and cold. Maritime tropical (mT) air masses are moist and warm.
List the four types of air masses that affect the weather of North America with their six source regions. continental polar from Canada; maritime polar from the Pacific Ocean; maritime polar from the Atlantic; continental tropical from the U.S. southwest; maritime tropical from the Pacific; and maritime tropical from the Atlantic.
What type of weather does an air mass usually bring? An air mass usually brings the weather of its source region.
What may happen to an air mass as it moves away from its source region? Give an example. Air masses sometimes change as they move; cold, dry air might warm and become moist as it moves from land to ocean.
What develops when cold, dry air turns warm and moist? Clouds and precipitation develop.
Describe the weather created by maritime tropical air masses that form over the tropical Atlantic Ocean. They bring mild, cloudy weather to the East coast in winter and hot, humid weather with thunderstorms in summer.
How does the weather created by maritime tropical air masses that form over the tropical Pacific Ocean differ from that created by air masses that form over the tropical Atlantic? Maritime tropical air masses that form over the warm tropical Pacific usually do not reach the coast. In winter, they bring moderate precipitation to the coast and southwestern deserts.
Explain where continental polar air masses generally originate and move and the type of weather they bring. Continental polar air masses form over ice- and snow-covered land. They move down over the northern United States, sometimes all the way to the Gulf of Mexico. They bring cool, dry air in summer and very cold weather in winter.
Describe maritime polar air masses that form over the North Pacific Ocean and the type of weather they create. Cold and very moist air masses - winter they bring rain and snow to the Pacific coast. In summer, they bring cool, often foggy weather. As they move inland, they warm slightly and lose moisture over the mountains. Thus, they may bring cool, central U.S.
How do continental polar Canadian air masses differ from the polar air masses that form over the North Pacific Ocean? The polar Pacific air masses are not as cold as the continental polar Canadian air masses.
How do maritime polar Atlantic air masses differ in movement and weather creation from the maritime Pacific air masses? Maritime polar air masses move generally eastward toward Europe, but sometimes they swing over Canada and New England. In winter, they bring cold, cloudy weather and snow. In summer, they can produce cool weather, low clouds, and fog.
Created by: tbfreema

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