1 / 10

Do Now

Do Now. What do you think happens when two air masses meet? Why?. Fronts. What is a front?. http://www.natgeoeducationvideo.com/film/1193/the-movement-of-air-masses. Fronts. When two air masses meet, the air within them does not easily mix. the air stays within its own air mass.

sheffieldm
Download Presentation

Do Now

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Do Now • What do you think happens when two air masses meet? Why?

  2. Fronts What is a front? http://www.natgeoeducationvideo.com/film/1193/the-movement-of-air-masses

  3. Fronts • When two air masses meet, the air within them does not easily mix. • the air stays within its own air mass. • Because of this a border forms between two clashing air masses, as they rub together. • This border is called a front.

  4. Fronts • Each air mass has a different temperature depending on its’ geographic origin. • Fronts are caused by winds moving one air mass away from its geographical origin (birthplace). • Fronts are usually associated with rain, snow, or hail. Thunderstorms, tornados and other severe weather can occur with fronts.

  5. 4 Types of Fronts There are 4 different types of fronts: Cold FrontWarm Front Stationary FrontOccluded Front

  6. Cold Fronts • A front bringing in a cold air mass is referred to as a cold front. • Cold air is dense and tends to sink. • Typically cold fronts move faster. • The combination of higher speed, and slope push warm air masses upward very quickly. • Cold Fronts are usually associated with more violent weather. • After a cold front passes through, weather is usually clear and cool.

  7. Warm Fronts • Fronts that bring warm air are referred to as warm fronts. • Warm fronts move slowly. • Cold air is more dense than warm air, so the warm air moves over the cold air. As the air in the warm air mass rises, it expands, causing it to cool down. • As it cools, water vapor can condense creating precipitation and clouds/fog. • After a warm front passes through the weather is usually warm and humid. • Winter warm fronts bring snow

  8. Stationary Fronts • When two air masses come together, but neither one is strong enough to move the other, the boundary between them is referred to as a stationary front. (like a stand-off) • Where the warm and cold air meet, water vapor in the warm air turns into rain, snow, fog, or clouds.

  9. Occluded Front • A warm air mass becomes “trapped” between two cold fronts. • The denser cold air moves underneath the warm air and pushes it up. • The warm air above the cool air allows for water vapor to condense and turn cloudy, rainy, or snowy.

  10. Watch this video! http://www.youtube.com/watch?v=tkK4_F0VKhM

More Related