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Air Pressure & Weather

Air Pressure & Weather. High pressure generally means fair weather. Air mass in upper atmosphere is sinking (cold, dense air). No clouds. Warm, moist air cannot rise. Layer of Air. Low pressure generally means cloudy, rainy weather. Warm air rises, clouds form. Air masses move apart.

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Air Pressure & Weather

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  1. Air Pressure & Weather

  2. High pressure generally means fair weather Air mass in upper atmosphere is sinking (cold, dense air) No clouds Warm, moist air cannot rise Layer of Air

  3. Low pressure generally means cloudy, rainy weather Warm air rises, clouds form Air masses move apart

  4. Weather Map Symbols

  5. Air Masses • Air masses are huge chunks of air that have the same temperature and density.

  6. What are Fronts? • Fronts happen when 2 different air masses meet BUT they do not mix together • 4 Different Types of Fronts: • Cold Front • Warm Front • Occluded Front • Stationary Front Fronts: Mr Parr Rap Song

  7. Cold Fronts • What happens? A fast moving cold air mass runs into a slow moving warm air mass, pushing the warm air up quickly to form clouds. • Weather forecast: heavy rains and thunderstorms

  8. Cold Front: Weather map symbol • A cold front symbol—The direction that the teeth point indicate the direction the front is moving.

  9. Warm Fronts • What happens? A fast moving warm air mass collides with a slowly moving cold air mass. Warm air slowly moves over the cold air. • Weather forecast: slow steady rain!

  10. Warm front: Weather Map Symbol • Warm Front symbol—The directions that the bumps face is the direction the front is moving.

  11. What types of fronts can you find on the map? In which direction are they moving?

  12. Stationary Front • What happens: A cold air mass and warm air mass meet, but neither air mass has enough force to move the other air mass. • Can sometimes mix together OR will turn into a warm or cold front. • Weather forecast: clouds, rain for multiple days

  13. Stationary Front: Weather Map Symbol Not moving in any direction!

  14. Occluded Front • What happens: A cold air mass is overtaken by a warm air mass. A larger cold air mass joins the other two. They all three go up in the same direction. • Weather forecast: Varied weather, but generally clear.

  15. Occluded Front: Weather Map Symbol

  16. What types of fronts can you find on the map? In which direction are they moving?

  17. Summary of Front Symbols

  18. Practice Reading Weather MapsWhich types of fronts can you find on this map?

  19. What types of fronts are on the map? In which direction are they moving?What type of weather would it produce?

  20. What types of fronts are on the map? In which direction are they moving?What type of weather would it produce?

  21. What types of fronts are on the map? In which direction are they moving?What type of weather would it produce?

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