12 OED Weather

4. A large rotating system of low pressure that brings strong winds and heavy rain
5. A large area of low atmospheric pressure where air rises, often bringing clouds, wind, and rain
8. A device used to measure wind speed
9. A low cloud that forms at ground level, reducing visibility
11. A rotating high pressure system that generally brings clear, settled weather
13. Thick, dark clouds that produce heavy rain, thunderstorms, or snow
14. A device used to measure air pressure
15. The amount of water vapour in the air

1. Lines on a weather map that connect places with equal air pressure, used to show pressure patterns
2. The temperature at which air becomes saturated and water vapour condenses into liquid
3. A boundary where a warm air mass rises over a cold air mass, usually bringing steady rain and cloud over a longer period
4. A boundary where a cold air mass pushes under a warm air mass, often causing sudden storms and heavy rain
6. The movement of air caused by differences in air pressure
7. High, wispy clouds made of ice crystals, often indicating fair weather but possible change
10. A large area of high atmospheric pressure where air sinks, often bringing clear skies and calm weather
12. Fluffy, cotton-like clouds usually associated with fair weather but can grow into storm clouds