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Air Masses

Air Masses. . . . and . . . FRONTS. Meteorology Seventh Grade Science ~ Mrs. Thomas. A HUGE mass of air can have the characteristics of the area over which it occurs. . Moist Air. Cool or COLD Air. Dry Air. Warm or HOT Air.

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Air Masses

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  1. Air Masses . . . and . . . FRONTS Meteorology Seventh Grade Science ~ Mrs. Thomas

  2. A HUGE mass of air can have the characteristics of the area over which it occurs. Moist Air Cool or COLD Air Dry Air Warm or HOT Air http://disney-clipart.com/mickey-mouse/mickey-mouse/mickey-mouse20.php

  3. Other ways to name air masses... polar marine marine arctic continental marine marine tropical

  4. OBSERVE + DISCUSS earth.usc.edu/.../Catalina/WeatherPatterns.html

  5. When we discuss weather (or meteorlogy), what is a front? When two air masses of different temperatures meet, a BOUNDARY is formed between them, called a front. http://disney-clipart.com/Ratatouille/Gusteau.php

  6. In time of war, what is a front? http://i-love-disney.com/disney-gallery/displayimage.php?album=147&pos=7 A front is a zone of conflict between opposing armies.

  7. COMPARE a weather front to a battle front ... COOL MOIST air HOT DRY air cool, moist air FIGHTS the hot, dry air... and the cool moist air often "wins" because... (why??)

  8. HOT DRY air COOL MOIST air COOL moist air is more dense, heavier, and STRONGER than the lighter, less dense, rising hot, dry air. COOLER air can push warmer air out of the way! http://i-love-disney.com/disney-gallery/displayimage.php?album=147&pos=9

  9. How many different kinds of WEATHER fronts exist? Occluded Front Warm Front Stationary Front Cold Front http://disney-clipart.com/Disney-Character-Clipart.php

  10. http://www.physicalgeography.net/fundamentals/images/coldfront.GIFhttp://www.physicalgeography.net/fundamentals/images/coldfront.GIF Cold Front page 128 • cold air pushes warmer air • warmer air is forced to rise • as boundaries meet, water condenses + precipitation forms • Thunderstorms CAN result • cumulus + cumulonimbus clouds • the temperature DROPS after the front has passed REMEMBER:COLD or COOL air is heavier and more dense than warm air.Cooler air has more force than warmer air. http://disney-clipart.com/Disney-Character-Clipart.php

  11. www.aos.wisc.edu/~aalopez/aos101/wk13.html Advancing cold front is like a plow COLD fronts bring choppy gusty winds. www.camelotdesign.com/crazy.htm

  12. OBSERVE + DISCUSS www.bbc.co.uk/.../synoptic_charts_rev2.shtml

  13. www.physicalgeography.net/fundamentals/7r.html Warm Front Page 128 • warmer air is moving in a region of cooler air • warmer less dense air rises + slides up and over the cooler air • warmer air begins to cool as it rises up • water vapor in the warmer cool has to condense + precipitation will form over a large area • high cirrus clouds are seen first • clouds become lower + lower as the front approaches REMEMBER:HOT or WARM air is lighter and less dense than cool air.Warmer air has less force than cooler air. http://disney-clipart.com/Disney-Character-Clipart.php

  14. www.aos.wisc.edu/~aalopez/aos101/wk13.html Advancing warm air is like a gentle breeze etc.usf.edu/clipart/19400/19477/feather_19477.htm “Light as a feather” type of breeze. www.camelotdesign.com/crazy.htm

  15. OBSERVE + DISCUSS

  16. http://library.thinkquest.org/C0125863/weather/image/front_stationary_en.gifhttp://library.thinkquest.org/C0125863/weather/image/front_stationary_en.gif Stationary Front http://www.thedeets.com/wp-content/uploads/2007/08/arm-wrestling-shocker.jpg http://www.kewaunee.k12.wi.us/Clipart/Sport%20Clipart/Wrestling%20Clipart/wrestlers_arm_locked_sm_wht.gif • a warm air mass and a cold air mass meet but NEITHER ONE advances • This front can stay in the same location for several days. • cloudiness + precipitation occur along the front • precipitation can be heavy since the front does not move very much “Stalled” air masses. Not moving. www.camelotdesign.com/crazy.htm

  17. OBSERVE + DISCUSS http://www.kidsgeo.com/images/stationary-front_sm.jpg

  18. Occluded Front www.physicalgeography.net/fundamentals/7r.html http://www.kewaunee.k12.wi.us/Clipart/Sport%20Clipart/Wrestling%20Clipart/wrestlers_arm_locked_sm_wht.gif • FAST moving COLD front overtakes a SSSLLLOOOWWW moving warm front • produces cloudy weather with precipitation REMEMBER:WARM air is lighter and less dense than cool air.Warmer air gets pushed up and out of the way by the rushing COLDER air. But warm air can hold the moisture for the clouds and precipitation. library.thinkquest.org/.../weather/front.html

  19. http://disney-clipart.com/Disney-Character-Clipart.php http://www.goldiproductions.com/images/cba/weather/weath_coldocclusion.jpg http://www.mrsciguy.com/sciimages/cyclone04.gif Occluded Front http://www.pilotfriend.com/training/flight_training/met/images2/12.gif http://physics.uwstout.edu/wx/u8/U8_12c.gif

  20. OBSERVE + DISCUSS

  21. OBSERVE + DISCUSS http://www.bbc.co.uk/schools/gcsebitesize/geography/images/g_wc_pwc5.gif

  22. OBSERVE + DISCUSS http://earthscience.files.wordpress.com/2007/05/fronts.jpg

  23. REVIEW

  24. Cool Air + Moist Cool Air + Moist COLD Air + DRY HOT Air + DRY Warm Air + Moist Warm Air + Moist earth.usc.edu/.../Catalina/WeatherPatterns.html

  25. Cold Front Warm Front http://apollo.lsc.vsc.edu/classes/met130/notes/chapter11/graphics/cf_xsect.jpg http://earth.usc.edu/~stott/Catalina/images/weatherimages.jpg/ninefive.jpg

  26. http://www.cartoonstock.com/lowres/cza0530l.jpg

  27. What kind of front is this? ( Look how this front covers MANY states! ) http://www.free-online-private-pilot-ground-school.com/images/occluded-front.gif

  28. Analysis of a Thuderstorm associated with a Stationary Front http://tornado.sfsu.edu/geosciences/Geosciences_Docs/Activities/SLS_Conference_2006/Furnas/May22_files/image003.jpg On 22 May 2004, a supercell thunderstorm (hereafter referred to as the “Furnas County storm”) developed in extreme northwest KS (southwest of McCook, Nebraska) and moved through Furnas and Harlan Counties, Nebraska, spawning 3 tornadoes during its life cycle (Fig. 1). Tornado T1 was the largest (Fig. 2) but because it was in open country and did no significant damage (light damage to a farm and several trees debarked) was given a rating of F1.

  29. DO NOT get caught in the study trap ! The test monster !!! Knock out the monster by studying for your quiz on Air Masses and clouds and Fronts and storms!

  30. This Power Point Presentation was created by Janet Moran, March 2008, for science classes at Copeland Middle School, Rockaway Township, NJ. Edited by Mrs. Thomas For HBW. All pictures used in this Power Point Presentation contain web site links to credit intellectual property. Please follow those links to find more information about AIR MASSES and FRONTS.

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