1. Warm-up Week 7 ____ is the most important weather gas.
a. water vapor c. carbon dioxide
b. oxygen d. ozone
Warm, saturated air ___________.
a. Has less water vapor than cold air.
b. Has more water vapor than cold air.
c. Does not have any water vapor.
d. Has the same amount of water vapor as cold air.
___ is the change of state from a gas to a liquid. a. deposition c. evaporation
b. sublimation d. condensation

2. “Clouds & Precipitation”
18.2/18.3

8. What is Condensation? Condensation forms when…?
Water droplets forming!
Condensation forms when…?
…Air becomes saturated.
Add water vapor
Cool Air (dew point)

9. If condensation requires cooling, how do we get clouds on hot days?
Air Compression (close together!)
↑ Motion of gas molecules
↑ Kinetic E.
↑ Temp
Air Expansion (spread apart!)
Air cools
Adiabatic
Tempo
Changes
No heat
added!

10. Did it just get hotter or colder?!

11. Altitude & Heating/Cooling
↓ Molecules
Expansion
Cooling
-10oC / 1000m
↑ Molecules
Compression
Heating
+10oC / 1000m
“Dry Adiabatic Rate”

12. Condensation Needs… S_________ (wet) Air! and also… Surface! ATURATED
“Condensation Nuclei”
Car
Cup
DUST
ATURATED

13. Forms: Cloud Types. Classified (grouped) by 1.) Form, & 2.) Height
Cirrus
“curl of hair”
High
White, thin
Cumulus
“Pile”
Rounded
Domed
Stratus
“Layer”
Sheets
Whole sky

14. Cirrus Cumulous Stratus
What Kind of Cloud?
Cirrus
Cumulous
Stratus

15. 3 Cloud Heights. High Middle Low “Cirro-” Thin & White Freezing cold
“Alto-”
Some precipitation
Low
“Strato-,” & “Nimbo-”
Layered
Rainy

16. Precipitation. Hail Glaze Sleet Rain Snow Water molecules cool
Squish together
Grow
Fall!