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Science EQ: What causes weather? Do Now: 3-19

Science EQ: What causes weather? Do Now: 3-19. LG: Identify the air masses that create weather in the US. Describe the 4 types of weather fronts and the weather associated with each. HW: Study for test on Thursday

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Science EQ: What causes weather? Do Now: 3-19

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  1. Science EQ: What causes weather?Do Now: 3-19 LG: Identify the air masses that create weather in the US. Describe the 4 types of weather fronts and the weather associated with each. HW: Study for test on Thursday 1. Air Mass chart notes – homework – stack or blue card if not completed 2. Take out Power Point Notes: Air Masses and Fronts Today ~ complete VO: Air Masses ~ power point/notes: Air Masses and Fronts

  2. Air Masses and Fronts

  3.  Air Mass VIDEO Clip 

  4. Air Masses • Air masses have the same properties as the surface over which it develops: maritime= Wet continental= Dry polar = Cold tropical = Warm mP = wet/cold cP = dry/cold mT = wet/warm cT = dry/warm

  5. Air Masses in North America

  6. WARM AIR FRONT COLD AIR Fronts A front is the boundary where two air masses meet. Types of fronts: • Cold Front • Warm Front • Occluded Front • Stationary Front Warm Air Cold Air

  7. Front VIDEO Clip 

  8. Cold Front • Cold dense air pushes under a warm air mass. • The cold dense air moves faster and causes the warm air rises quickly. • Narrow bands of violent storms form.

  9. Why do cold fronts bring heavy rain and storms? • Cold air interacting with warm air sudden drop in temperature • Condensation occurs quickly  difference in pressure • Creates cumulonimbus clouds • Thunderstorms, heavy precipitation • Cold dense fast moving air = high winds What you see on a weather map!

  10. Cold Front Video Clip

  11. Warm Front • Warm air slides over departing cold air. • Large bands of precipitation form

  12. Why do warm fronts bring mild weather? • It’s more difficult for the warm air to move against the cold dense air • Gradual difference in pressure and temperature • Drizzly rain • Followed by clear & warm weather What you see in a weather map!

  13. Warm Front Video Clip

  14. Occluded Front • Two cold air masses merge and force warm air between them to rise quickly. • Strong winds and heavy precipitation will occur.

  15. Why do occluded fronts bring heavy rain and storms? • Cold air that is more dense moves into an area of low pressure = CONDENSATION occurs quickly • Forms cumulonimbus and nimbostratus clouds What you see in a weather map!

  16. Stationary Front • Warm and/or cold front stops moving. • Light wind and precipitation may occur across the front boundary.

  17. Why do stationary fronts bring long light precipitation? • Neither front is strong enough to move the other • Can stay put for days • Differences in temperature = rain or snow Whatyouseein a weather map!

  18. Cyclones and Anticyclones • Areas of HIGH and LOW pressure • Cyclone = LOW PRESSURE = spin counterclockwise = associated with storms and precipitation • Anticyclone = HIGH PRESSURE = spin clockwise = associated with fair weather.

  19. Cyclones and Anticyclones in the USA

  20. Cyclone Video Clip 

  21. Check Air Mass Chart - # 8 1.Which is more dense, warm air or cold air? Cold air is more dense. 2. What do you think would happen if a large mass of cold air came into contact with a large mass of warm air? The cold air would sink down and the warm air mass would rise.

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