Chapter 20

4. A cool or cold air mass that originates over upper latitudes.
9. The lifting of a warm air mass above a cool air mass acting as a wedge.
10. A weather map that presents a summary or synopsis of weather data for a given time frame.
12. A warm air mass that originates in the tropics.
13. A severe weather disturbance involving high winds, heavy precipitation, and other conditions, such as lighting or low temperatures.
14. The boundary where at least 2 different air masses meet.
16. A frigid air mass that originates over the upper latitudes.
19. A rainstorm that produces lighting. Thunderstorms may include hail, bursts of strong winds, and even tornadoes.
20. The low-pressure center of a hurricane containing relatively clear, calm, rising air. The eye usually has light winds, low precipitation, and low pressure.

1. A low humidity air mass that originates over land.
2. A symbolic representation of data from a weather station on a weather map. Each number and symbol, and their locations in the model, provide specific weather information.
3. An immense cyclonic windstorm that forms over tropical or subtropical oceans; hazardous to ships at sea or extremely damaging if it moves over land.
5. The upward movement of air masses as they flow over mountains.
6. A storm that brings heavy snow of sleet, high winds, and/or unusually cold weather.
7. A strong cyclonic storm with winds of at least 39 mi.
8. A high humidity air mass that originates over the ocean.
11. A higher than normal local sea level caused by seawater flowing toward the lower air pressure under a hurricane.
12. destructive localized rapidly rotating cyclonic windstorm forming a funnel.
15. An atmospheric electrical discharge that occurs between clouds or a cloud and the ground.
17. A huge body of air in the troposphere with similar temperature and humidity throughout.
18. The lifting of air when horizontal air currents from opposite directions collide and rise into the atmosphere.