1. Precipitation
Chapter 8
Section 2

2. Standard
S 6.4.e Students know differences in pressure, heat, air movement, and humidity result in changes in weather.

3. Anticipatory Set Squirt students above their heads What am I doing?
What is this called?
How would you describe the droplet that just hit your face?

4. Language of the Discipline
Precipitation

5. Precipitation
Any form of water that falls from clouds and reaches Earth’s surface.
Not all clouds produce precipitation
Cloud droplets or ice crystals must grow heavy enough to fall from the air
As they grow larger, they move faster and collect more rain

6. Types of Precipitation
Common Types: rain, hail, sleet, snow and freezing rain
Rain- drops of water if 0.5 millimeters big
Drizzle or mist falls from stratus clouds
Hail- Round pellets, like an onion
A hailstone starts as an ice pellet, reaches a cold spot in cloud and add layers to the pellet, it will repeat this process a couple of times. When it is heavy enough, it will fall towards Earth.
Causes damage to crops, buildings, vehicles.

8. Snow- water vapor is converted into ice crystals (snow flakes)
Snow- water vapor is converted into ice crystals (snow flakes). 6 Sides, different shapes and patterns
Powder snow: when snow falls through cold, dry air
Sleet- raindrops that fall through 0*C (freezing point of water). Smaller than 5 diameter
Freezing Rain- when rain freezes when it touches a cold surface (not in the air).
In an ice storm a layer of ice builds up on every surface. It can make walking on surfaces dangerous

10. Checking for Understanding
What are the common types of precipitation?
What is sleet?
What is freezing rain?

11. Guided Practice Independent Practice
Guided Practice- Worksheet
Stop! Check your answers with your teacher
Independent Practice- Workbook