1. EQ: How can we use weather patterns to help explain our world? Exit: Starter: 10/27/15 79 80 Air Masses and Fronts 10/27/15 Practice : Notes glue here when done Application: Air mass sort Connection: Air mass Map Air Masses and Fronts Using the information you learned today, explain how an air mass and a front would affect the weather in an area.

2. January 27, 2015 AGENDA Objectives 8.10 B: Students will identify and recognize how global patterns of atmospheric movement influence local weather using weather maps that show high and low pressures and fronts by reading and writing while completing notes and an activity 1 Starter 2. Practice-Notes 3. Activity 4. Ws 5. Exit

3. Date Lecture/ Activity/ Lab Page 10/16 Unit 5 vocabulary 65-66 10/17 Quiz/Writing 67-68 10/20 Weathering Notes 69-70 10/21 Weathering Lab 71-72 10/22 Climate, Wind and Ocean Currents 73-74 10/2374-76 10/24 Wind and Currents Writing 77-78 10/27 Fronts and Air Masses 79-80 Table of Contents Convection and Ocean Currents

5. Air Masses and Fronts

6. Air Masses Air masses have different temperatures and humidity levels When they collide the more dense air mass goes under the less dense air mass There are 5 types and are classified according to where they form: If an air mass forms over land (continental) it has low humidity If an air mass forms over an ocean (maritime) it has high humidity Air masses are either hot or cold

7. Forms over ocean near equator Holds warm, moist air In summer- hot, humid In winter-rain, snow Maritime Tropical (mT)

8. Maritime Polar (mP) Forms over the polar regions Holds cold, moist air During summer- cooler temps. During winter- heavy snow and cold temperatures

9. Continental Tropical (cP) Forms over Mexico only in the summer time. Brings dry, hot air to Southwestern US

10. Continental Polar (cP) & Continental Arctic (cA) Forms over land in North Canada Holds cold, dry air Causes extremely cold temps in the US in winter Continental Arctic Masses only happen in the winter

11. Fronts  Fronts are the leading edges of air masses with different air temperature and/or humidity.  When a front passes over an area, it is marked by changes in temperature, moisture, wind speed and direction, and precipitation.

12. Cold Front  Occurs when a polar (cold) air mass runs into a tropical (warm) air mass  The warm air is less dense and gets pushed above the cold air mass  Temperatures drop, and there is usually precipitation  Thunderstorms are usually a result of a cold front

13. Warm Front Occurs at the place where a warm air mass replaces a cold air mass. The warm air mass is denser and will slowly push the cold air, eventually rising above it. Results in warmer temperatures. Usually precipitation.

14. 3. Occluded Front a. Occurs when a cold front overtakes a warm front b. Has cool temperatures and large amounts of rain and snow

15. 4. Stationary Front a. When a warm air mass meets a cold air mass and no movement occurs b. Brings drizzly rain c. Clear, warm weather afterward Cold Air Warm air 56 42

16. Application/Connection AIR Mass Sort With a partner, match the word with the definition that describes it.

20. EQ: How can we use weather patterns to help explain our world? Exit: Starter: 10/27/15 79 80 Air Masses and Fronts 10/27/15 Practice : Notes glue here when done Application: Air mass sort Connection: Air mass Map Air Masses and Fronts Using the information you learned today, explain how an air mass and a front would affect the weather in an area.