 What causes weather?

1. Anticipatory Set o Bellringer o Objective 2. Input (Notes on Fronts) 3. Guided Practice – Front ID Game 4. Independent Practice – Handout 5. Closing

 After today you will be able to define an air mass and front. You will also be able to identify types of fronts.

 80% Mastery

 An air mass is a large body of air that has similar temperature and moisture throughout

 1. What is an air mass?

 A front forms when two air masses meet.

 Warm air rises because it is less dense.  Cold air sinks because it is more dense.

 1. Which kind of air sinks?  2. Why does it sink?

 A cold front is when a cold air mass overtakes a warm air mass.

 A warm front is when a warm air mass overtakes a cold air mass.

 1. What types of air masses are involved in a cold front?  2. What is a warm front?  3. What is the difference between a cold and warm front?

 A stationary front is when a cold air mass and a warm air mass meet and both stop moving.

An occluded front is when a cold front overtakes a warm front.

 1. What is a stationary front?  2. What is an occluded front?

 Each group should get 4 boards and one marker.

 A warm air mass overtakes a cold air mass.

 A cold front overtakes a warm front.

 Cold and warm air masses meet and little movement occurs.

 A cold air mass moves under the warm air mass, forcing the warm air up.

 What do meteorologist call a large body of air that has similar temperatures and moisture throughout it?

 What type of air rises?