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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 _______
```
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