1. Clouds and Fog
Section 24.2

2. Cloud Formation
Clouds result from the condensation of water vapor in the atmosphere
Suspended particles of ice, slat, dust, etc, provide the surfaces necessary for the cloud-forming condensation. These particles are called condensation nuclei.

3. Adiabatic Temperature Changes
Are changes in temperature that result from the expansion or compression of air
For dry air, temperature of dry air decreases about 1°C for every 100 m
For moist air it varies from 0.5°C to 0.7°C per 100m

4. Condensation Level
When the air reaches a level where its temperature is lower than its dew point, the moisture in the air condenses to form a cloud

5. Forceful Lifting
Air can be forced up quickly when it encounters a mountain range
During storms, warm air is pushed above denser cooler air

6. Classification of Clouds
Clouds are classified by their form and altitude
Low clouds – up to 2000 m
middle clouds m
high clouds – above 6000 m

7. Stratus clouds
Sheetlike, layered clouds. These are the most extensive clouds in the sky.
Little rain usually falls from these kinds of clouds
Varieties: nimbostratus, altostruatus

8. Cumulus

9. Cumulus CLouds

10. Cirrus Clouds