The document discusses the formation of clouds and weather patterns. It explains that the sun causes temperature differences and evaporation of water which leads to winds, humidity, and cloud formation. Clouds form when water vapor condenses on tiny particles in the air. The type of clouds that form depends on whether the rising air cools more slowly or rapidly than the surrounding air. Certain cloud patterns in the morning can help predict the weather for the day.

1. 7th Grade Chapter 6 Lesson 5 Pgs. 221 - 231 For Student Use Only

2. Clouds Weather Maker: The sun is the basic source for all weather. Seasons, clouds, winds, rain, snow, hail, lightning, rainbows, hurricanes are all from sun Sun evaporates water Sun creates temp. differences which causes winds Water Vapor in the air is humidity High humidity- tropical Low humidity- arid

3. Clouds Weather Maker: Humidity- the amount of water vapor in the air Temperature affects amount of water vapor the air can hold WARM air can hold more water vapor than cold air can Saturated- when air holds all the water vapor it can Humidity is shown in percentage

4. Clouds Weather Maker: Relative Humidity: The amount of water vapor in the air compared to what it can hold Dew Point: The temperature at which cooling air becomes saturated (100% humidity) Lowest temp. at which air can keep hold of water Dew- when the air at ground level gets cool and water “falls out”

5. Clouds Weather Maker: Weather Proverbs: When dew is on the grass, Rain will never come to pass Water was taken out of air When grass is dry at morning light, Look for rain before the night Frost: Water vapor freezes immediately into a solid (no liquid state)

6. Clouds Weather Maker: Weather Proverbs: When dew is on the grass, Rain will never come to pass Water was taken out of air When grass is dry at morning light, Look for rain before the night Frost: Water vapor freezes immediately into a solid (no liquid state)

7. Clouds Weather Maker: Clouds are made of very tiny water droplets It takes over one million of these droplets to make a single raindrop Higher air is colder it is farther from the surface of the Earth Lapse Rate- the rate at which the air temperature falls

8. Clouds Cooler Temps: Cooler temps are at higher elevation Warmer temps are at lower elevation Once past the troposphere the temperature can increase depending on make-up of atmosphere Temperature Inversion: warmer air lying on top of colder air

9. Clouds Clouds must have something to condense upon Condensation Nucleus: The center of a tiny droplets of liquid water Clouds can build and they can vary according to how they were formed Thermals: rising columns of warm air

10. Clouds Unstable Air Unstable air: when rising air cools more slowly than surrounding air there can be storms If day is very hot and humid it can produce a thunderhead (supercloud) Stable Air: Thermals cool more rapidly than surrounding air Clouds in the morning can help predict weather

11. Clouds Fun Forecasting: If fleecy white clouds cover heavenly way, No rain should mar your plans that day In the morning, mountains; In the evening, fountains Collision of Clouds: Cold air, strike warm air and create a front Weather front: the boundary between a warm air mass and a cold air mass