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Across 3. A visible electrical discharge produced by thunderstorms. 6. A unit for expressing atmospheric pressure. 7. An instrument designed to measure the air's water vapor content. 10. White granular deposit of ice formed by water drops freezing on contact. (2 Words) 14. The process by which a liquid changes into a gas. 16. A coating of ice on objects formed when super cooled rain freezes on contact. 17. The transition zone between two distinct air masses. 19. Very thing fog in which visibility is greater than 1.0 km. 20. A cumulative force exerted on any surface by the molecules composing air. (2 Words) 21. Any sudden and heavy rain shower. 23. Distant lightning that illuminates the sky but, is too far away for it's thunder to be heard. (2 Words) 24. A line on a weather map connecting points of equal win temperature.

Down 1. An aggregate of ice crystals that falls from a cloud. 2. A hurricane that forms in the Western Pacific Ocean. 3. A wind blowing onshore from the surface of a lake. (2 Words) 4. Air that has some reduced visibility due to pollution. 5. An instrument that automatically records cloud height. 8. A line on a weather map connecting points of equal wind speed. 9. An instrument designed to measure wind speed. 11. The leading edge of a cold air mass. (2 Words) 12. Weather surveillance radar system developed in 1998. (2 Words) 13. When a star appears to be twinkling in the atmosphere. 15. Light showers of snow. (2 Words) 18. A device that measures rain fall. (2 Words) 22. A line on a weather map connecting points of equal pressure.