WEATHER

2. sudden spark or electric discharge between parts of a cloud, nearby clouds or between a cloud and the ground
4. high pressure centers of dry air
6. the process in which liquid water changes to a gas
11. tropical cyclones that form over warm ocean water
13. water that falls to Earth as rain, snow, sleet, or hail.
16. water that runs over Earths surface to the ocean
17. lines on the weather map that joins places that have the same temperature
18. the amount of water vapor that is in the air compared to the maximum water that the air can hold
19. a fast moving cold air mass overtakes a cold air mass
21. a body of air that has similar temperatures, humidity, and air pressure
22. a whirling center of low air pressure
23. the process in which water vapor (gas) changes into a liquid
24. an instrument used to measure relative humidity
25. the boundary where air masses meet

1. a small storm often accompanied by heavy precipitation, thunder, and lightning.
3. the temperature in which condensation begins
5. air masses that from over land; dry
7. the movement of water between the atmosphere and Earth's surface
8. scientists who study the causes of weather and try to predict it
9. a gas
10. a rapidly whirling funnel-shaped cloud that reaches down from a storm cloud to touch Earths surface
12. a dome of water that sweeps across the coast where hurricanes land
14. the amount of water vapor in the air
15. violent disturbances in the atmosphere
20. a warm air mass overtakes a slow-moving cold air mass, clouds and precipitation occur.