1. Chapter 16 Earth Science
WEATHER

2. Words to Know – Section 1 What is weather?
humidity
relative humidity
dew point
Fog
precipitation

3. state of the atmosphere at a specific time and place, determined by factors including air pressure, temperature, wind, and precipitation
weather

4. amount of water vapor held in the air
humidity

5. measure of the amount of moisture held in the air compared with the amount it can hold at a given temperature; 0 percent to 100 percent
relative humidity

6. temperature at which air is saturated and condensation forms
dew point

7. a stratus cloud that forms when air is cooled to its dew point near the ground
fog

8. water falling from clouds – including rain, snow, sleet ,and hail – whose form is determined by air temperature
precipitation

9. Words to Know – Section 2 Weather Patterns
air mass
front
tornado
hurricane
Blizzard
spring

10. large body of air that has the same characteristics of temperature and moisture content as the part of Earth’s surface over which it formed
air mass

11. boundary between two air masses with different temperatures , density, or moisture; can be cold, warm, occluded, and stationary
front

12. violent, whirling windstorm that crosses land in a narrow path and can result from wind shears inside a thunderhead
tornado

13. large, severe storm that forms over tropical oceans, has winds of at least 120 km/h, and loses power when it reaches land
hurricane

14. winter storm that lasts at least three hours with temperatures of -12 degrees C or below, poor visibility, and winds of at least 51 km/h
blizzard

15. forms when the water table meets Earth’s surface; often found on hillsides and used as a fresh-water source
spring

16. Words to Know – Section 3 Weather Forecasts
meteorologist
station model
Isotherm
isobar

17. studies weather and uses information from Dopplar radar, weather satellites, computers and other instruments to make weather maps and provide forecasts
meteorologist

18. indicates weather conditions at a specific location, using a combination of symbols on a map
station model

19. line drawn on a weather map that connects points hacing equal temperature
isotherm

20. lines drawn on a weather map that connect points having equal atmospheric pressure; also indicate the location of high – and low-pressure areas and can show wind speeds
isobar