Application: Air mass sort 79 Air Masses and Fronts 80 Air Masses and Fronts 10/27/14 10/27/14 Application: Air mass sort Connection: Air mass Map Starter: Object Description Practice : Notes glue here when done Exit: Using the information you learned today, explain how an air mass and a front would affect the weather in an area.

1 Starter 2. Practice-Notes 3. Activity 4. Ws 5. Exit January 27, 2014 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

Table of Contents Convection and Ocean Currents 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 10/23 74-76 10/24 Wind and Currents Writing 77-78 10/27 Fronts and Air Masses 79-80 Convection and Ocean Currents

Air Masses and Fronts

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

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

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

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

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

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.

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

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.

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

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

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

Application/Connection: Glue foldable here and turn in questions. 151 Air Masses and Fronts Air Masses and Fronts 152 1/27/14 1/27/14 Application/Connection: Glue foldable here and turn in questions. Connection/Exit: Relate air temperature to the type of precipitation that will fall. Starter: Current Activity: Turn in when finished Practice : Notes glue here when done