1. Mrs. Anna Ward Ridge Road MS

2. Do Now!!! (Page 20)

3. Announcements Weather Starts today Major Concepts complete by the holiday break Notebook Check Next Week

4. Agenda: Today, Tomorrow, and Friday Air Masses Air Masses in a box Fronts Video Interactive Fronts Activity High/Low Pressure Independent Work (dispersal)

6. What is Humidity? Humidity: The measure of the amount of water vapor in the air Relative Humidity: The amount of water vapor in the air versus the total amount it can hold at a certain temperature http://app.discoveryeducation.com/player/view/asset Guid/C0C2E8D0-366C-4AC0-9CEF-D9C3E39B6E81 http://app.discoveryeducation.com/player/view/asset Guid/C0C2E8D0-366C-4AC0-9CEF-D9C3E39B6E81

7. Air Masses An Air Mass is a large volume of air that has nearly the same temperature and humidity at different locations at the same altitude.

8. TEMPERATURE They can be POLAR (formed over cold regions) They can be TROPICAL (formed over warm regions)

9. HUMIDITY They can be MARITIME (formed over oceans--wet) They can be CONTINENTAL (formed over land--dry)

10. Air Mass Video: http://app.discoveryeducation.com/player/view/asset Guid/241A89DE-CB9A-4915-AC9A-EC47DF396970 http://app.discoveryeducation.com/player/view/asset Guid/241A89DE-CB9A-4915-AC9A-EC47DF396970

11. Page 21: Air Masses in a Box Drawing Water Temperature Temperature of Air at 8:00 am Temperature of Air at _______________

12. Air Mass in a Box Activity Air masses are large masses of air in the lower troposphere that take on the properties of the land/water below them. In this simulation you will get to feel how an air mass works. In front of you are three boxes. Each has a small cup of water inside of it with a different temperature of water. Stick your hand into each of the boxes. On the line below the correct drawing, write if the air feels “hot”, “cold”, or “like the air in the room”. Also write down the time in the “temperature of air at _______________” box.

13. Follow Up Questions (bottom Pg. 21) Answer the following questions back at your seat: 1. How is the air in the box similar to an air mass? 2. What would happen if we took the lid off of the boxes? What would happen to the air? Explain this for each box. Think carefully about temperature and pressure!

14. Air Masses Reading Passage While some of you are completing the activity, the other half of the class will be reading and taking notes on the Passage, “The Schoolhouse Blizzard”.

15. Warm Up!!!! PLEASE LABEL PAGE 22 AS “FRONTS” Please draw the following on Page FRONT SYMBOLS:

16. Video http://app.discoveryeducation.com/player/?assetGuid =AB673034-72A8-4BE3-B7CE- A5C89162ACE6&layout=standalone http://app.discoveryeducation.com/player/?assetGuid =AB673034-72A8-4BE3-B7CE- A5C89162ACE6&layout=standalone

17. Cold front Cold front occurs when a rapidly moving cold air mass runs into a slowly moving warm air mass. Warm weather cools suddenly Windy Often intense rain/thunderstorms as front comes in Low pressure turns to high pressure http://www.phschool.com/atschool/phsciexp/acti ve_art/weather_fronts/index.html http://www.phschool.com/atschool/phsciexp/acti ve_art/weather_fronts/index.html

18. Warm front Slowly moving warm air mass collides with a slowly moving cold air mass. This causes the warm air to rise over the cold air, thus producing a warm front. May have gentle rain as front is passing Gets warmer gradually Drop in air pressure http://www.phschool.com/atschool/phsciexp/active_a rt/weather_fronts/index.html http://www.phschool.com/atschool/phsciexp/active_a rt/weather_fronts/index.html

19. Stationary front Sometimes cold and warm air masses meet, but neither one has enough force to move the other. They face each other in a “standoff,” resulting in a stationary front. No change in weather or pressure Often rains for days at a time Typically very cloudy http://www.phschool.com/atschool/phsciexp/active_a rt/weather_fronts/index.html http://www.phschool.com/atschool/phsciexp/active_a rt/weather_fronts/index.html

20. Occluded front A warm air mass is caught between two cooler air masses. Complex, and very rare! http://www.phschool.com/atschool/phsciexp/active_a rt/weather_fronts/index.html http://www.phschool.com/atschool/phsciexp/active_a rt/weather_fronts/index.html

21. Front Diagrams

22. Atmosphere air pressure: Air pressure is the weight of the atmosphere pressing down on the earth

23. Air pressure can change Altitude: how high you are If you hike up a mountain, your altitude increases.

24. Air pressure can change The higher your altitude, the less air pressure is on you. This is because there is less air above you Related to density (low density…low air pressure)

25. Air Pressure and Weather

26. High pressure areas are usually sunny Low Pressure areas are usually cloudy/rainy

27. L L H H

28. What kind of pressure is over Charlotte today?

29. Air movement Air moves AWAY from high pressure Air moves TOWARDS low pressure