Weather Concepts Challenge

3. Air mass responsible for our desert in the southwest; brings very little precipitation.
4. A weather __________ can change hour by hour, is highly variable, and is often wrong.
7. Measuring relative humidity requires using 2 thermometers, wet and dry, then calculating the __________.
12. Relative humidity will increase if __________ moves into the area.
13. At a ____________ front, Warm and cold air collide from different directions and very violent weather persists for days.
14. Lines on a weather surface map that tracks air pressure.
15. Wind ____________ is determined by how much air pressure change there is over an area.
19. This air mass is responsible for hurricanes and our monsoon.
20. Front where cold air slides under warm air; always brings colder weather, and is often preceded by a line of storms.
21. Front where warm air slides over cold air; might bring rain and thunderstorms, but definitely warmer weather.

1. A boundary where two air masses are colliding.
2. Low pressure areas pull in _____ from surrounding areas.
5. Air mass that is found over central Canada.
6. If a Cold front runs into another cold air mass, the warm air mass gets pinched up; creates heavy storms for a few days.
8. This rises when temperature falls, and falls when temperature rises.
9. a measure of how many molecules occupy an area on the surface of Earth,
10. In the Northeast and Northwest, most of their cold, rainy weather is influenced by ___________ ________ air masses.
11. ____ pressure is responsible for stormy weather.
13. A weather ___________ map shows current air pressure, precipitation, and front conditions across the U.S.
16. The day to day change in environmental conditions.
17. Wind ___________ is determined by orientation of high-to-low pressure over an area.
18. If molecules are descending from the upper troposphere, they do so at _____ pressure zones.