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Air Masses and Weather Fronts

Air Masses and Weather Fronts. http://www.inkcinct.com.au/Web/CARTOONS/2006/2006-694-Weather-front-title-fight.jpg. Air Masses. Air mass – large body of air that takes on the characteristics of the area of which it forms (source region) Over land – drier Over water – more humid

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Air Masses and Weather Fronts

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  1. Air Masses and Weather Fronts http://www.inkcinct.com.au/Web/CARTOONS/2006/2006-694-Weather-front-title-fight.jpg

  2. Air Masses • Air mass – large body of air that takes on the characteristics of the area of which it forms (source region) • Over land – drier • Over water – more humid • Also takes on temperature of source region http://blogs.redding.com/redding/smobley/archives/3-24-08-today-gfsx_500p_24h.gif

  3. Air Masses - Origins • What do you think Air Mass #1 would be like in April? Cold/Warm? Moist/Dry? Why? • What do you think Air Mass #2 would be like in April? Why? http://www.kidsgeo.com/images/air-masses.jpg

  4. Air Masses - Origins • Maritime tropical (mT) • warm and humid • Continental tropical (cT) • warm and dry • Maritime polar (mP) • cold and humid • Continental polar (cP) • cold and dry • Arctic (A) • even colder!

  5. Air masses don’t just affect the US!! http://www.geography.learnontheinternet.co.uk/images/weather/air_masses.gif

  6. Worksheet – Transparency 18 Answer questions on the back

  7. Weather Fronts • Form where two air masses with different characteristics collide • Four types • Cold • Warm • Occluded • Stationary http://www.bynon.cc/blog/fronts.jpg http://www.windows.ucar.edu/earth/Atmosphere/images/front_superior_epa_lg.jpg

  8. Cold Front • Cold air moves in on existing warm air (blue triangles) • Rapidly rising warm air  cools, condenses • Thunderstorms common http://www.physicalgeography.net/fundamentals/7r.html

  9. Cold Front http://www.windows.ucar.edu/tour/link=/earth/Atmosphere/images/cold-front_lg_gif_image.html&edu=high

  10. Warm Front • Warm air invades area of cool air (red circles) • Warm air rises over cool air  cools, condenses • Rain common http://www.physicalgeography.net/fundamentals/7r.html

  11. Warm Front http://www.windows.ucar.edu/earth/Atmosphere/images/warm-front_lg.gif

  12. Cold Front vs. Warm Front View Animation

  13. Occluded Front • Warm air gets trapped between two cold fronts (red circles and blue triangles/purple circles and triangles) • Warm air forced up  cools, condenses • Complex weather, rain/snow, thunderstorms http://www.physicalgeography.net/fundamentals/7r.html

  14. Occluded Front http://www.windows.ucar.edu/tour/link=/earth/Atmosphere/images/occluded_lg_gif_image.html&edu=high

  15. Stationary Front • No mixing (blue triangles and red circles) • Air masses push against each other, but neither moves • Parallel winds • Hard to predict weather http://www.windows.ucar.edu/earth/Atmosphere/images/stationary_sm.gif

  16. Weather fronts from Monday

  17. Worksheet – Transparency 19 Fill out the questions on the back. Color the front if it helps you.

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