how do air masses move across the us

An air mass forms whenever the atmosphere remains in contact with a large, relatively uniform land or sea surface for a time sufficiently long to acquire the temperature and moisture properties of that surface. … The Earth’s major air masses originate in polar or subtropical latitudes.

What causes air movement between the land and the ocean?

As the temperature of the surface of the land rises, the land heats the air above it by convection. … The air above the sea has a relatively higher pressure, causing air near the coast to flow towards the lower pressure over land.

How does heat move in convection?

Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy. Heat energy is transferred from hot places to cooler places by convection. Liquids and gases expand when they are heated. … The denser cold liquid or gas falls into the warm areas.

Which option identifies the two natural wind patterns that move air masses in the United States?

Which option identifies the two natural wind patterns that move air masses in the United States? The jet stream is one of the key winds that moves air masses. In which direction does the jet stream in the United State generally move air masses?

Which major type of air mass typically brings cool dry weather?

Answer: Maritime air masses form over water and are humid. Continental air masses form over land and are dry. Therefore, an air mass that develops over northern Canada is called a continental polar air mass and is cold and dry.

Why is a stationary front called stationary?

Stationary Front

This happens when two masses of air are pushing against each other, but neither is powerful enough to move the other. Winds blowing parallel to the front instead of perpendicular can help it stay in place. A stationary front may stay put for days.

Why air masses moving on the surface of the earth move in the way or direction they do?

Cold air masses tend to move toward the equator. Warm air masses tend to move toward the poles. The Coriolis effect causes them to move on a diagonal. Many air masses move toward the northeast over the U.S. This is the same direction that global winds blow.

How do air masses move relative to each other at a warm front?

At a warm front, a warm air mass slides over a cold air mass (Figure below). When warm, less dense air moves over the colder, denser air, the atmosphere is relatively stable. Warm air moves forward to take over the position of colder air.

Which factors cause air masses to move in the United States check all that apply?

One major influence of air mass movement is the upper level winds such as the upper level winds associated with the jet stream. The jet stream wind is often referred to as a steering wind. The troughs and ridges of the jet stream will help transport cold air toward lower latitudes and warm air toward high latitudes.

How does the movement of Earth affect the movement of air masses in North America?

The Coriolis Effect

An air mass flowing from the North Pole to the equator (shown in green) is deflected to its right in the Northern Hemisphere, due to the rotation of the earth. Warm, dense, high-pressure air masses tend to flow away from the equator towards cool, less dense, low-pressure air masses at the poles.

Which type of air mass would most likely move south from Canada into the United States?

continental polar air mass

2. A continental polar air mass can form over the land during the winter months. In the Northern Hemisphere, it originates in northern Canada or Alaska. As it moves southward, it brings dry weather conditions to the United States.

How would an air mass that forms in the northern Atlantic Ocean?

Maritime polar (mP): Cool and moist. They usually bring cloudy, damp weather to the USA. Maritime polar air masses form over the northern Atlantic and the northern Pacific oceans. … As they move eastward, moisture evaporates into the air, making the air mass more like a maritime tropical air mass.

What air masses are most important for the climate in the USA?

The polar continental, the maritime tropical, and the maritime polar Pacific are the most influential air masses.

What are the major causes of moving air masses in North America?


how do air masses move across the us



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