1. Chapter 20: Air Masses Section 20.1 - Agenda Origins of an Air Mass Types of Air Masses -Continental Artic -Continental Polar -Maritime Polar -Continental Tropical -Maritime Tropical

2. Meteorology - This is the study of processes that govern Earth’s atmosphere helps make weather predictions possible. - Meteorologists are the scientists who specialize in this study - Meteorologists include 1. make weather predictions (forecast) 2.study how tornadoes develop 3. study how hurricanes develop 4. storm chasers - This is the study of processes that govern Earth’s atmosphere helps make weather predictions possible. - Meteorologists are the scientists who specialize in this study - Meteorologists include 1. make weather predictions (forecast) 2.study how tornadoes develop 3. study how hurricanes develop 4. storm chasers

3. Where do Air Masses Come From? An Air Mass is a large body of air in the lower troposphere that has similar characteristics throughout. When an air mass travels from one place to another, it takes with it the temperature and humidity of its place of origin.

4. Cold air mass from Canada will make Chicago Cold and dry. -Warm and humid air mass from the Gulf of Mexico will make Chicago hot and humid. Cold air mass from Canada will make Chicago Cold and dry. -Warm and humid air mass from the Gulf of Mexico will make Chicago hot and humid.

5. Scientists classify an air mass based on whether it originates in an arctic, in a polar, or in a tropical region and whether it forms over land (continental) or sea How do we classify an Air Mass?

7. Continental cA Continental Arctic very cold, dry cP Continental Polar cold, dry cT Continental Tropical hot, dry Continental cA – (Continental Arctic) very cold & dry. cP – (Continental Polar) cold & dry. cT – (Continental Tropical) hot & dry.

8. Continental Arctic – Northern Canada

9. Continental Polar – Southern Canada

10. Continental Tropic - Arizona

11. mP Maritime Polar cool, moist mP Maritime Polar cool, moist mT Maritime Tropical warm, moist mT Maritime Tropical warm, moist Maritime mP – (Maritime Polar) cool & moist. mT – (Maritime Tropical) means warm &moist. Vis 2001

12. Maritime Polar - Vancouver Canada – Lower Western

13. Maritime Tropical - Florida

14. REVIEW…

15. Lets Practice – Find the Origin cA Continental Arctic very cold, dry mP Maritime Polar cool, moist cP Continental Polar cold, dry mP Maritime Polar cool, moist mT Maritime Tropical warm, moist mT Maritime Tropical warm, moist cT Continental Tropical hot, dry What is the Origin of air masses: 1.Dry and Cold 2.Moist and Warm 3.Dry and Hot 4.Dry and Very Cold 5.Moist and Cool