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V. Clouds & Precipitation. A. Cloud Formation. 1. All clouds require 3 things: a. water vapor b. condensation nuclei- something for water to bond with c. cooling- air must be cooled below dew point . B. Temperature & Cloud Formation.

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a cloud formation
A. Cloud Formation

1. All clouds require 3 things:

a. water vapor

b. condensation nuclei- something for water to bond with

c. cooling- air must be cooled below dew point

b temperature cloud formation
B. Temperature & Cloud Formation
  • Compression/high pressure- air is warmer than dew point, so evaporation occurs = No cloud
  • Expansion/low pressure (air rising)- air temp. is than dew point, so condensation occurs = Cloud forms
c cloud types
C. Cloud Types

1. Cirrus- wispy, feathery high altitude clouds.

a. Made of ice crystals

slide6

2. Stratus- flat, spread out layers. Low to middle altitude.

a. form through horizontal air movement

slide8

3. Cumulus- fluffy, rounded, medium altitude clouds.

a. form through vertical air movement

b. cumulus- “piled”

slide10

4. Cumulonimbus- large rain/storm cloud

a. nimbo – “rain”

b. cumulo- “column like”

slide13

Cirrus

Cumulunimbus

stratus

cumulus

g forms of condensation
G. Forms of Condensation

1. Frost- when the temp of the air is below 0°C, then the water vapor condenses as a solid.

slide15

2. Fog- cloud formation near Earth’s surface.

a. Ground/radiation fog- during nighttime with sky clears, the ground loses heat rapidly by radiation.

1.) breeze mixes air at ground level

2.) air is cooled below the dew point and fog forms.