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Chemistry Web Quest Weather Land and Sea Breezes Click on the Animation Below http://www.classzone.com/books/earth_science/terc/content/visualizations/es1903/es1903page01.cf m?chapter_no=visualization Describe the cause of land and sea breezes. Warm and Cold Fronts To see an animation, click on the following link: http://www.teachersdomain.org/ext/mck05_int_fronts/index.html What type of clouds form when a cold air mass runs into a warm air mass? Describe what happens when a warm air mass runs into a cold air mass. Get a Satellite View of Our Weather http://www.intellicast.com/Local/WxMapFull.aspx What Are Isobars? Click on the site below and follow all directions including printing out a map to do your work. http://www.srh.noaa.gov/jetstream/synoptic/ll_analyze_slp.htm This activity will assist you in creating and interpreting weather maps with isobars. The image below shows an example of a weather map containing isobars. The thick black lines are called isobars. They are typically placed at intervals of 4 millibars. Millibars DO NOT CROSS as it is impossible to have two different pressures at the same place. 1. Determine which 4 millibar intervals will be necessary to use for this map. (Keep in mind that the isobars are found every 4 millibars such as 996, 1000, 1004, etc.) 2. Draw in the isobars on the map above. Start with the 1020 mb line, then adding the 1016, 1012, 1008, millibar lines. Label each isobar. Note: isobars form sets of curves that do not cross each other. Isobars can be used to identify "Highs" and "Lows". The pressure in a high is greater than the surrounding air. The pressure in a low is lower than the surrounding air. 3. Label with an "H" the center of a high pressure area. 4. Label with an "L" the center of a low pressure area. High pressure regions are usually associated with dry weather because as the air sinks it warms and the moisture evaporates. Low pressure regions usually bring precipitation because when the air rises it cools and the water vapor condenses. A boundary between two air masses is called a front. Can you mark on the map where a front possibly could be? Do you know if it is a warm front or a cold front? Why or why not? 5. Over which state would you expect to see rain or snow? 6. Over which state would you expect to see clear skies? In the northern hemisphere the wind blows clockwise around centers of high pressure. The wind blows counterclockwise around lows. It is the opposite in the southern hemisphere. 7. Draw arrows around the "H" on your map to indicate the wind direction. 8. Draw arrows around the "L" on your map to indicate the wind direction. Isotherms – An isotherm is a line on a map that shows equal temperatures. Like the isobars, lines can never cross. Go to the site to practice, then do a hard copy version below for evidence. Go to this site: https://courseware.eeducation.psu.edu/public/meteo/meteo101demo/Examples/Images/Section2/contour_tool_t0 203.swf Test Yourself: Go To: http://www.dnr.sc.gov/climate/sco/Education/wxmap/wxmap.php Record score ______ Go to http://www.quia.com/quiz/278988.html Record Score _______