2. http://www.ucar.edu/educ_outreach/webweather/cloud3.html Clouds http://www.centennialofflight.gov/2003FF/clues/

3. Cirrus Clouds Cirrus clouds are the most common of the high-level clouds. These clouds are mainly composed of ice crystals, which come from the freezing of supercooled water droplets and exist at heights (usually above six km) where the temperatures are typically below -38 C. Cirrus are thin, wispy and usually white in appearance. They generally occur in fair weather and move from west to east across the sky, indicating the direction of the prevailing winds. Cirrus can come in several shapes and sizes, from the finger- shapes seen during pleasant weather conditions to the uniform texture of more extensive cirrus clouds, which can be the first sign of an approaching warm front. http://classweb.howardcc.edu/meteorology/Clouds/METO111CirrusClouds.htm

4. Stratus clouds are uniform grayish clouds that often cover the entire sky. They resemble fog that does not reach the ground. Usually no precipitation falls from stratus clouds, but sometimes they may drizzle. When a thick fog "lifts," the resulting clouds are low stratus. Stratus Clouds

5. Altostratus Clouds Altostratus clouds are gray or blue-gray middle level clouds composed of ice crystals and water droplets. These clouds usually cover the entire sky. In the thinner areas of the cloud, the sun may be dimly visible as a round disk. Altostratus clouds often form ahead of storms that will produce continuous precipitation.

6. Cumulus Clouds Cumulus, the puffy, cottonball cloud most often seen on a summer day, is probably the most familiar to cloudgazers. These clouds have a flat base and distinct outlines, and their colors range from white to light gray. The bases can be as low as 1 km above the ground, and they usually have a diameter of about a kilometer. Given the right conditions, cumulus clouds can develop into larger, more towering clouds, which usually means precipitation is about to occur. http://classweb.howardcc.edu/meteorology/Clouds/METO111CumulusClouds.htm

7. Cumulonimbus clouds are much larger and more vertically developed than the fair weather cumulus cloud. It can exist as a single towering cloud, or can even develop into a line of such towers, also known as a "squall line." Fueled by vigorous convection, these clouds can climb vertically in the atmosphere to an altitude of 12 km or higher. The lower portion of the cloud is made up of water droplets, while at the cloud top, where temperatures are well below 0 C, there are primarily ice crystals. These clouds are capable of developing into great thunderheads which contain all forms of precipitation: snowflakes, snow pellets, large raindrops, and sometimes hailstones. Lightning, thunder, and even violent tornadoes sometimes accompany intense cumulonimbus clouds.

8. Cumulonimbus Clouds http://www.centennialofflight.gov/2003FF/clues/

9. http://www.ucar.edu/educ_outreach/webweather/cloud3.html

10. High Pressure http://www.ucar.edu/educ_outreach/webweather/basic4.html

11. High pressure systems mean sunny, clear days. http://www.usatoday.com/weather/tg/whighp/whighp.htm

12. Low pressure systems bring storms or days of precipitation http://www.usatoday.com/weather/tg/wlowpres/wlowpres.htm

13. An air mass is a large body of air. Forms by staying in the same place for several days Covers large areas Same temperature Same moisture throughout http://www.usatoday.com/weather/tg/wamsorce/wamsorce.htm

14. Front: the boundary between 2 air masses Cold Front Forms when a cold air mass overtakes a warm air mass The warm air rises cooling water vapor rapidly forming cumulonimbus clouds Storms form producing heavy rain Warm Front Forms when a warm air mass overtakes a cold air mass Warm air slides over the denser colder air Cirrus clouds first then low gray stratus Steady rains lasting several days http://www.weatherforyou.com/maps/fronts.shtml

15. Warm front – not as nice as it sounds http://www.usatoday.com/weather/tg/wwfront/wwfront.htm

16. Cold front http://www.usatoday.com/weather/tg/wcfront/wcfront.htm

17. http://www.ucar.edu/40th/webweather/tstorms/tstorms.htm A strong, persistent updraft of warm moist air is formed and lifted by the approaching cold front. Speeds in an updraft can be as fast as 90 miles per hour! The air cools as it rises, condenses, and forms cumulus clouds. When condensation occurs, heat is released and helps the thunderstorm grow. The cumulus cloud has grown into a cumulonimbus cloud at above about 30,000 feet (about 9 km).

18. Stationary Front - warm and cold air battle to a standoff http://www.usatoday.com/weather/tg/wsfront/wsfront.htm

19. Cold Front

20. Cumulonimbus clouds start to build creating thunderstorm activity.

21. Cumulonimbus

26. Write the type of front and complete the white blanks on the graphic. http://ww2010.atmos.uiuc.edu/(Gh)/wwhlpr/c old_front_prcpexp.rxml?hret=/guides/crclm/ac t/fpr.rxmlhttp://ww2010.atmos.uiuc.edu/(Gh)/wwhlpr/c old_front_prcpexp.rxml?hret=/guides/crclm/ac t/fpr.rxml

27. http://ww2010.atmos.uiuc.edu/(Gh)/wwhlpr/war m_front_prcpexp.rxml?hret=/guides/crclm/act/fp r.rxmlhttp://ww2010.atmos.uiuc.edu/(Gh)/wwhlpr/war m_front_prcpexp.rxml?hret=/guides/crclm/act/fp r.rxml

28. Resources http://www.ucar.edu/educ_outreach/webwe ather/cloudhome.htmlhttp://www.ucar.edu/educ_outreach/webwe ather/cloudhome.html http://members.tripod.com/~MitchellBrown/almanac/cloud s.htmlhttp://members.tripod.com/~MitchellBrown/almanac/cloud s.html

29. Resources http://www.weatherforyou.com/maps/fronts.shtmlhttp://www.weatherforyou.com/maps/fronts.shtml http://www.usatoday.com/weather/wstorm0. htmhttp://www.usatoday.com/weather/wstorm0. htm