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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 http://disney-clipart.com/mickey-mouse/mickey-mouse/mickey-mouse20.php OBSERVE + DISCUSS earth.usc.edu/.../Catalina/WeatherPatterns.html When two air masses of different temperatures meet, a BOUNDARY is formed between them, called a front. http://disney-clipart.com/Ratatouille/Gusteau.php http://i-love-disney.com/disney-gallery/displayimage.php?album=147&pos=7 A front is a zone of conflict between opposing armies. COOL MOIST air HOT DRY air COOL MOIST air HOT DRY air http://i-love-disney.com/disney-gallery/displayimage.php?album=147&pos=9 http://disney-clipart.com/Disney-Character-Clipart.php http://www.physicalgeography.net/fundamentals/images/coldfront.GIF • 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 http://disney-clipart.com/Disney-Character-Clipart.php REMEMBER: COLD or COOL air is heavier and more dense than warm air. Cooler air has more force than warmer air. www.aos.wisc.edu/~aalopez/aos101/wk13.html COLD fronts bring choppy gusty winds. www.camelotdesign.com/crazy.htm OBSERVE + DISCUSS www.bbc.co.uk/.../synoptic_charts_rev2.shtml www.physicalgeography.net/fundamentals/7r.html • 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 www.aos.wisc.edu/~aalopez/aos101/wk13.html etc.usf.edu/clipart/19400/19477/feather_19477.htm “Light as a feather” type of breeze. www.camelotdesign.com/crazy.htm OBSERVE + DISCUSS http://library.thinkquest.org/C0125863/weather/image/front_stationary_en.gif http://www.thedeets.com/wp-content/uploads/2007/08/arm-wrestling-shocker.jpg • 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 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 OBSERVE + DISCUSS http://www.kidsgeo.com/images/stationary-front_sm.jpg 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 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 http://www.pilotfriend.com/training/flight_training/met/images2/12.gif http://physics.uwstout.edu/wx/u8/U8_12c.gif OBSERVE + DISCUSS OBSERVE + DISCUSS http://www.bbc.co.uk/schools/gcsebitesize/geography/images/g_wc_pwc5.gif OBSERVE + DISCUSS http://earthscience.files.wordpress.com/2007/05/fronts.jpg Cool Air + Moist Cool Air + Moist COLD Air + DRY HOT Air + DRY Warm Air + Moist Warm Air + Moist earth.usc.edu/.../Catalina/WeatherPatterns.html http://apollo.lsc.vsc.edu/classes/met130/notes/chapter11/graphics/cf_xsect.jpg http://earth.usc.edu/~stott/Catalina/images/weatherimages.jpg/ninefive.jpg http://www.cartoonstock.com/lowres/cza0530l.jpg http://www.free-online-private-pilot-ground-school.com/images/occluded-front.gif 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. 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 MASSES and FRONTS. AIR