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Air Masses and Fronts

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by

Mabel Pena

on 3 December 2014

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Transcript of Air Masses and Fronts

                                                                                                  A warm air mass is caught between two cooler air masses.
As warm air cools and its water vapor condenses, the weather may turn cloudy, rainy, or snowy. Occluded Fronts A moving warm air mass collides with a slowly moving cold air mass. The warm air mass pass over the cold air mass.
If the warm air is humid showers and light rain might fall along the front where the warm and cold air meet.
After a warm front passes through an area the weather is likely to be warm and humid.
Winter warm fronts bring snow. Warm Fronts Cold Fronts.
Warm Fronts.
Stationary Fronts.
Occluded Fronts. Four types of fronts The prevailing westerlies are the major wind belts in the United States.
Prevailing westerlies push air masses from west to east. How do air masses move? Form over central and northern Canada and Alaska.
Bring cool and cold air.
In winter they bring clear, cool, and dry air to most of northern America.
In the summer, storms may occur when continental air masses move south and meet maritime tropical that move north. Continental Polar (cP) Hot dry air masses form only in the summer over dry areas of southwestern and northern Mexico.
Bring hot, dry weather to the south. Continental Tropical (cT) Warm humid air masses form over oceans near the tropics.
They form over the Gulf of Mexico and the Atlantic Ocean.
In the summer time maritime tropical usually bring hot humid weather.
In winter, a humid air mass can bring heavy rain or snow. Maritime Tropical (mT) Maritime Tropical
Maritime Polar
Continental Tropical
Continental Polar EQ: What are air masses? What are the four types of air masses? By: Mrs. Peña - 5th Grade The Atmosphere,
Air Masses
and Fronts Sometimes cold and warm air masses meet but neither one has enough force to move.
Where the warm and cold air meet, water vapor in the warm air turns into rain, snow, fog, or clouds. Stationary Fronts Warm air can hold more water vapor than cool air.
Cold air is dense and tends to sink.
Warm air is less dense and tends to rise.
When a moving cold air mass runs into a slowly moving warm air mass, the denser cold air slides under the warmer air and pushes it up causing clouds to form and bad weather
Cold fronts move quickly so they can cause weather changes.
When air masses meet it is called a front, the collision often causes storms and weather changes.
A front may be 15 to 200 kilometers wide and extend as much as 10 kilometers up to the troposphere.
The kind of front that develops depends on the characteristics of the air masses and how they move. Cool humid air masses form over the icy cold North Pacific and North Atlantic oceans.
The air masses affect the west coast more than the east coast.
In the summer they often bring rain, fog, and cool temperatures to the west coast. Maritime Polar (mP)                                                                                                   Fronts Cold Front Air masses are large bodies of air that take on the characteristics of the area where they form.
Air mass temperature and moisture are consistent throughout. EQ: What is the atmosphere? The atmosphere is a mixture of gases that surround the Earth.
The atmosphere is composed of 5 layers. http://studyjams.scholastic.com/studyjams/jams/science/weather-and-climate/earths-atmosphere.htm (Study Jams Video) Study Jams Video- Masses and Fronts http://studyjams.scholastic.com/studyjams/jams/science/weather-and-climate/air-masses-and-fronts.htm Moisture content is noted by the first letter (lower case):
m – maritime – wet
c – continental – dry
Temperature is noted by the second letter (upper case):
P – polar – cool
T – tropical - warm
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