1. Clouds & Precipitation Sections 2.3 & 2.4
1/2/2019 8:25 AM
Clouds & Precipitation Sections 2.3 & 2.4
By: Dr. Abdulaziz Taqi PhD
Ali Al Osaimi
Musaed Al Hazeem
Hadi Dahbour
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2. Please save all questions for the end of the lecture
Please save all questions for the end of the lecture. If you behave, there will be two bonus questions on your quiz!

3. Vocab 2.3
Evaporation, the process by which a liquid changes into a gas
Condensation, the process by which a gas changes into liquid. Occurs when moist air cools

4. Precipitation, any type of liquid or solid water that falls to Earth’s surface
Humidity, the amount of water vapor in the air.
Saturation, the conditions when condensation and evaporation are equal

5. Relative humidity, compares the amount of water vapor in air with the maximum amount of water vapor that can be present at that temperature
Dew point, the temperature at which air with a given amount of water vapor will reach saturation

6. Types of Clouds

7. Cirrus Form in very cold air High altitudes Have a feathery appearance
Can be a sign that a storm is coming

8. Cumulus Puffy-looking cotton ball like
Appear in fair weather, usually at daytime
Cooler sinks along the sides, keeping them separated from each other
The cumulonimbus cloud is the biggest and can be up to 18 kilometers high

9. Stratus Form in layers when air cools over a large area without rising
Grey and dark looking
If formed at high altitudes, much thinner

10. Fog A cloud that rests on the ground or a body of water
Forms when a surface is colder than the air above
Cleared when the ground is heated by sunlight

11. Vocab 2.4
Freezing rain, raindrops that freeze when they hit the ground or other surfaces.
Sleet, when rain passes through a layer of cold air and freezes before hitting the ground

12. Hail, lumps of ice that fall from cumulonimbus clouds
Acid rain, rain that is more acidic than normal because of pollution

13. Precipitation All comes from clouds
There are two ways that precipitation forms
Cloud droplets collide with each other to form raindrops
Growth of ice crystals
When a cloud is freezing, cloud droplets become ice crystals

14. Types of Precipitation
There are 6 types of precipitation
Rain, freezing rain, acid rain, sleet, snow, hail

15. Rain Most common type of precipitation
Form from both cloud droplets and ice crystals that melt before as they fall
Light rain with very small drops is called drizzle

16. Freezing Rain
Rain that freezes when it hits the ground or other surfaces
The weight of the ice can bring down trees and power lines

17. Sleet
When rain passes through a layer of cold air and freezes before hitting the ground
The small pellets of ice are called sleet
NOT TO BE CONFUSED WITH HAIL!!!!!!!!

18. Snow Form as ice crystals grow and merge in clouds
When falling through moist air, snowflakes join together
When it falls through dry air, they don’t join and the snow is powdery

19. Hail Lumps of ice that fall from cumulonimbus clouds
Water grows on frozen ice pellets again, and again until it eventually falls as hail
The biggest hailstone ever found weighed 1.7 pounds

20. Acid Rain Rain that is more acidic than normal because of pollution
Factories, automobiles, and power plants release sulfur dioxide into the air which is combined with the water vapor

21. Cats & Dogs By far the most dangerous form of precipitation
Falls after tornadoes or report card day