1. Daily Routine Sit in your appropriate seat quietly
All back packs on the floor
All cell phones away
ID’s on or out on the desk
All IPods off and headphones out of your ears
Have all necessary materials out
Hats off
No food or drink except for water

2. Bell Work
An Earth Science class decides to go outside to observe the current weather during the class period. The teacher asks the class what are clouds made of, and these are some of the students’ answers.
Clouds are made of only water vapor in the atmosphere
Clouds are made from smoke
Clouds are made of condensed water on particles
Clouds are made from air pollution

3. Bell Work
Which student do you agree with about the composition of clouds. Explain your answer.
Clouds are made of water vapor in the atmosphere
Clouds are made from smoke
Clouds are made of condensed water on particles
Clouds are made from air pollution

4. Earth Science Announcements
Atmosphere Test – Thursday, February 27th
Bring in an empty 2L bottle for extra credit

5. Can we predict the weather
Cloud Formation and Cloud Type

6. Today we will
Explain how clouds form in relation to the steps of evaporation and condensation of the water cycle
Explain how clouds and help us predict the weather

7. Cloud Formation = Water Cycle
1. Water evaporates and becomes water vapor
2. Water vapor condenses on particulate matter known as the condensation nuclei to form a water droplet.
3. The accumulation of water droplets and ice crystal on the condensation nuclei leads to cloud formation

8. What are clouds made of?
Condensation nucleus: particular matter floating in the upper atmosphere
Condensed liquid water
Clouds are not made of water vapor
Water vapor is a gas, so if clouds were made of water vapor, we wouldn’t see the clouds
Dust
Salt
Ice
Carbon (smoke particles)
Microorganisms

9. How clouds are formed…

10. Atmospheric Stability
Stable Air
Unstable Air
Temperature of surrounding air decrease with increasing height
Air mass rises and cools
Air mass cools quickly than the rest of the atmosphere
Reaches its max and then sinks back down
Fair weather
Temperature of surrounding air cools faster than air mass
Air mass less dense so it continues to rise
Produces clouds for thunderstorms

11. How can clouds help people predict the weather?
One way people can predict the weather with clouds is by looking at the cloud type.

12. Cirrus meaning 'curl, fringe‘
Got there name because of there thin, wispy shape
6000 meter (20,000 ft) in the air
Primarily formed of ice crystals
Usually represent good weather
(Howard, 2004)
precursor to bad weather as they tend to materialize on the leading edge of frontal activity

13. Cumulus the fluffy, cotton wool style clouds
form in stable air and are a result of ground heating and localized convection
Least understood cloud type
Can occur in fair weather or big thunderstorms (i.e. thunderheads)
(Howard, 2004)

14. Stratus meaning spread over area no real defined base or top
Layered clouds
Often to rainy, drizzly days
Fog is actually a ground level stratus cloud
(Howard, 2004)

15. Nimbus (Cumulonimbus)
meaning rain-bearing
very low levels to extremely high levels in the atmosphere
associated with heavy rain showers, hail, and thunder and lightning
(Howard, 2004)

16. Cool Cloud Videos http://www.youtube.com/watch?v=iA8hxhePWRg

17. Using Clouds to Predict the Weather
How Do I Tell if the Weather Will Get Better?
Fog disappears and is replaced by clear skies by mid-morning, or early afternoon.
The cloud base height is obviously rising, and possibly holes begin to appear in the covering.
(Howard, 2004)

18. Using Clouds to Predict the Weather
How To Tell if the Weather Is Going to get Worse?
If more cloud is forming, especially at medium or low levels, or the cloud that is present is getting thicker and blacker.
Clouds that are racing across the sky begin to get fuller, blacker or fill in from cumulus, to stratocumulus, or cumulus clouds begin to grow taller and blacker at the base.
Clouds are moving in all directions. This indicates extreme instability.
If it is a hot day and the clouds begin to grow in early to mid-afternoon, there is a good chance of rain and possibly thunder, later that evening.
The cloud base begins to drop.
(Howard, 2004)

19. Exit Slip

20. Daily Routine Sit in your appropriate seat quietly
All back packs on the floor
All cell phones away
ID’s on or out on the desk
All IPods off and headphones out of your ears
Have all necessary materials out
Hats off
No food or drink except for water

21. Bell Work How are clouds formed in relation to the water cycle?
What are clouds made of?

22. Can we predict the weather
Cloud Formation and Cloud Type

23. Today we will
Demonstrate how clouds are formed

24. What will happen in the bottle?
On a sheet of paper, write down the question above
Create a hypothesis of what you think will happen in the bottle

25. What will happen in the bottle?
Procedure:
Obtain a 2L bottle. If it still has a wrapper on it, remove the wrapper
Fill the 2L bottle with 2” of warm water
Close the cap on it and wait for the teacher
The teacher will light a match, blow it out and put it in the bottle for about a minute
Immediately cap the bottle
When instructed squeeze the bottle and then let go.
Let the bottle sit for a minute, and repeat the previous step

26. What will happen in the bottle?
What’s happening now?
Observation
Dropped match in bottle
Squeezed the Bottle and let go of the bottle
Squeezed the bottle and let go several time

27. What happened in the bottle?
Write down an explanation about what you think happened to cause the reaction in the demonstration.

28. What happened in the bottle?
Diagram how cloud formation is a component of the weather cycle. Label the processes involved with cloud formation and the phases of water associated with these processes.
How can we use clouds to predict the weather? Take some notes down to support your answer. How can we use them locally?