1. 18.3 Cloud Types and Precipitation
I. Types of Clouds
18.3 Cloud Types and Precipitation
 A) Clouds are classified on the basis of their form and height.
• 1- Cirrus (cirrus = curl of hair) are clouds that are high, white, and thin.

2. 18.3 Cloud Types and Precipitation
• 2-Cumulus (cumulus = a pile) are clouds that consist of rounded individual cloud masses.

3. 18.3 Cloud Types and Precipitation
• 3 -Stratus (stratus = a layer) are clouds best described as sheets or layers that cover much or all of the sky.

4. Cloud Classification
Makes no sense without caption in book

5. 18.3 Cloud Types and Precipitation
II. Fog
18.3 Cloud Types and Precipitation
A) Fog
1) a cloud with its base at or very near the ground.
 B) Fog Caused by Cooling
• 1) air cools, condenses into low lying areas

6. 18.3 Cloud Types and Precipitation
II. Fog
18.3 Cloud Types and Precipitation
 C) Fog Caused by Evaporation
• 1) When cool air moves over warm water, evaporation from the water surface may produce saturation.

7. 18.3 Cloud Types and Precipitation
III. How Precipitation Forms
18.3 Cloud Types and Precipitation
 A) For precipitation to form, cloud droplets must grow in volume by roughly one million times.
 B) Cold Cloud Precipitation
• 1) Bergeron process is a theory that relates the formation of precipitation to supercooled clouds, freezing nuclei, and the different saturation levels of ice and liquid water.

8. The Bergeron Process
Makes no sense without caption in book

9. 18.3 Cloud Types and Precipitation
III. Forms of Precipitation
18.3 Cloud Types and Precipitation
 2) The type of precipitation depends on the temp profile in the lower few kilometers of the atmosphere.
 C) Rain and Snow
• 1) In meteorology, rain= drops of water that fall that have a diameter of at least 0.5 mm.
• 2) At very low temperatures (when the moisture content of air is low) light fluffy snow made up of individual six-sided ice crystals forms.

10. 18.3 Cloud Types and Precipitation
Forms of Precipitation
18.3 Cloud Types and Precipitation
 D) Rain and Snow
• 1)Sleet is the fall of clear-to-translucent ice.
• 2) Hail is produced in cumulonimbus clouds.
• 3) Hailstones begin as small ice pellets that grow by collecting supercooled water droplets as they fall through a cloud.

11. Largest Recorded Hailstone
Makes no sense without caption in book