1. WEATHER -the state of the atmosphere at a specific time and place
-air pressure, wind, temperature, and humidity
- The SUN provides most of Earth’s energy, driving the water cycle

2. AIR TEMPERATURE A measure of how much molecules are moving
Higher temp = faster moving, far apart molecules
Lower temp = slower moving, closer together molecules

3. Anemometer- an instrument that measures wind speed
Caused by air moving from areas of high pressure to areas of lose pressure
Anemometer- an instrument that measures wind speed

4. The amount water vapor present in the air
HUMIDITY
The amount water vapor present in the air
Warmer temperatures allow for the humidity of air to be higher
Condensation occurs when there is enough water vapor in the air for it to be saturated
Relative humidity- the measure of the amount of water vapor present compared to the amount needed for the air to be saturated at a specific temperature

5. The TEMPERATURE at which air is saturated and condensation occurs
It changes with the amount of water vapor in the air

6. Form as warm air is forced upwards, expands, and then cools
CLOUDS
Form as warm air is forced upwards, expands, and then cools
Made of billions of tiny droplets of water attached to small particles of dust or salt that are suspended in the air
3 main types

7. STRATUS
Form at low altitudes and are associated with fair weather, rain, or snow

8. CUMULUS masses of puffy, white clouds, with flat bases
Found at great heights
Associated with fair weather and thunderstorms

9. CIRRUS Fibrous and curly
High, thin, white, feathery cloud made of ice crystals
Associated with fair weather and can indicate approaching storms

10. PRECIPITATION Water falling from clouds
Rain- temperature above freezing
Snow- water vapor turns directly to a solid
Sleet- starts as rain but then freezes on the way down
Hail- lumps of ice