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Tracking the Weather

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Tracking the Weather By: Miss Lowery What are air mass and fronts? In one of the islands of Hawaii rain falls about 350 days a year. A dessert in South Africa has not ... – PowerPoint PPT presentation

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Title: Tracking the Weather


1
Tracking the Weather
  • By Miss Lowery

2
What are air mass and fronts?
  • In one of the islands of Hawaii rain falls about
    350 days a year.
  • A dessert in South Africa has not seen rain for
    centuries!
  • Why is it rainy in some places and dry in others?

3
Air Mass
  • Large Areas of air have nearly the same
    properties.
  • These regions are called Air Masses.
  • Weather in one part of an air mass is like the
    weather throughout the rest of the air mass.

4
Fronts
  • As an air mass moves, it brings weather with it.
  • What happens when two air masses meet?
  • The two air masses slam into each other and the
    area where they meet is called a front.
  • A boundary between two air masses that have
    different temperatures.
  • Fronts usually cause a change
  • in weather.

5
Types of Fronts
  • Warm Fronts
  • Cold Fronts
  • Stationary Fronts

6
Warm Fronts
  • When a warm air mass pushes into a cold air mass,
    a warm front forms.
  • The warm air slides up and over the cold air
    mass.
  • A warm front usually brings light, steady rain.
  • After the front passes,
  • the temperature rises.

7
Cold Fronts
  • A cold front forms when a cold air mass pushes
    under a warm air mass.
  • The cold air mass forces the warm air mass upward
    quickly.
  • Thick clouds form as the warm air rises and
    cools.
  • Cold fronts often bring
  • stormy weather.

8
Stationary Fronts
  • Sometimes rainy weather can last for days.
  • This can be caused by a stationary front.
  • A stationary front is a boundary between air
    masses that are moving.

9
What is an air mass?
  • A mass of air covering a region that has almost
    the same temperature and water vapor throughout.

10
What is a front?
  • The area where two air masses with different
    temperatures meet.

11
What will happen if a cold air mass pushes into a
warm air mass?
  • A cold front will form. The warm air will rise
    and cool, which often will bring stormy weather.

12
How do warm front differ from cold fronts?
  • A warm front occurs when a warm air mass pushes
    into a cold air mass and slides up and over the
    cold air mass.
  • A cold front occurs when a cold air mass pushes
    into warm air mass and forces the warm air up and
    over the cold air mass.

13
  • Lets Make a Foldable!
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