Chapter 7 vocab words

1. large body of air that has the same characteristics, temperature and moisture content as the part of Earth's surface over which it formed.
4. measure of they amount of moisture held in the air compared with the amount it can hold at a given temperature; can range from zero percent to one-hundred percent
5. to predict a condition or event on the basis of observations
6. studies weather and uses information from Doppler radar, weather satellites computers and other instruments to make weather maps and provide forecasts.
7. amount of water vapor held in the air
9. winter storm that lasts at least three hours with temperatures of-12 Degrees C or below, poor visibility, and winds of at least 32 miles per hour
13. boundary between two air masses with different temperatures, density, or moisture; can be cold, warm, occluded, and stationary.
14. an tool used to measure atmospheric pressure
15. water falling from clouds - including rain, snow, sleet, and hail - whose form is determined by air temperature
17. violent, whirling wind storm that crosses land in a narrow path and can result from wind shears inside a thunder head

2. indicates weather conditions at a specific location, using a combination of symbols on a map.
3. temperature at which air is saturated and condensation forms
8. state of the atmosphere at a specific time and place, determined by factors including air pressure, amount of moisture in the air, temperature, wind, and precipitation
10. Line that shows equal atmospheric pressure on a map.
11. something that influences a result
12. large, severe storm that forms over tropical oceans, has winds of at least 75mp/h (120km/h), and loses power when it reaches land.
13. a stratus cloud that forms when air is cooled to its dew point near the ground
16. line drawn on a weather map that connects points having equal temperature