Weather

1. Transfer of heat by collision of particles in fluid
3. Gray, puffy, mid-level clouds
10. A box of weather instruments carried by a weather balloon
14. A person who studies the atmosphere
16. Rain,hail,sleet,snow,drizzle
17. Thin, wispy, high-level clouds
18. The narrow boundary or zone where 2 distinct air masses collide
19. A line on the weather map that connects points of equal atmospheric pressure
20. Phase change of a substance from a gas to a liquid

2. A measure of the average speed of molecules
4. Dirty fog
5. Direct transition from a solid to a gas
6. A narrow, high altitude band of strong winds (2/1)
7. The upward force exerted on an object in fluid that causes less dense objects to float
8. Temperature at which air must be cooled to become saturated with water vapor ( 2/1)
9. Dark gray, low-level cloud layers associated with continuous rain or snow
11. Large body of air that has similar temperature and moisture characteristics (2/1)
12. Area near to the equator characterized by light winds and low atmospheric pressure
13. Layer of Earth's atmosphere characterized by decreasing temperature with altitude
15. Also called typhoons or cyclones depending on where they form