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Across 1. Any form of water that falls from clouds and reaches the ground 5. Device for measuring the amount of precipitation that has fallen 7. The densest layer of the atmosphere 8. High level clouds that are mainly composed of ice-crystals 9. The amount of water vapor in the air 12. The study of weather 14. A tornado scale 15. The leading edge of an advancing storm system

Down 2. Water vapor that condenses and falls as liquid precipitation 3. Over 40,000 of these weather phenomena occur everyday 4. A severe tropical cyclone 6. A storm with strong winds, heavy snow, and severe cold 10. Visible electrical releases created by thunderstorms 11. An overflowing of water onto land that is normally dry 13. A vortex of air rising into a cloud 14. Thick water vapor that makes it hard to see