Precipitation Chapter 8 Section 2

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

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?

Language of the Discipline Precipitation

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

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.

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

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

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