Intro

1. Objective: 2/26/2013 List three types of cloud forms. Intro • Write Q&A in notebook: • What do you think is happening when you exhale and see a “cloud” of breath in cold temperatures?

2. Clouds

3. Condensation • Water vapor needs a surface to condense on

4. Collection of small water droplets or ice crystals suspended in air • Forms when the air is cooled and condensation occurs • Droplets can only form on solid surfaces • Dust particles mostly • Cloud

5. Three main types: • Classified by: • Cumulus clouds • Stratus clouds • Cirrus clouds • Form • Altitude

7. Cumulus Clouds • Puffy, white clouds with flat bottoms • Indicate fair weather • If they get very large, can form thunderstorms (cumulonimbus cloud)

8. Stratus clouds • Form in layers • Cover large areas of the sky and block out the Sun • Lower in altitude • Nimbostratus clouds – dark and rains continuously • Fog – stratus cloud on the ground

9. Cirrus clouds • Thin, feathery, white clouds • Form at very high altitudes where winds are strong • Made of ice crystals • Indicate a change of weather is coming

10. Precipitation • When clouds become full of water, they release it as either: • Rain – liquid water falls to ground • Snow – water freezes into snowflakes that fall to ground • Sleet (flipchart) • Hail (flipchart)

11. Objective: 2/26/2013 List three types of cloud forms. Outro At what altitude would you find a altostratus cloud? (low, medium, high)