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Across 1. forms when less dense air moves toward colder air 6. air mass that forms over siberia 8. boundary between two air masses 12. air masses that move fast and bring cole air to places like canada 17. when a cold air mass moves towards a warmer air front 18. air masses forming over the northern atlantic 19. system with pressure at the center and higher pressure on the outside.

Down 2. air systems masses which form the gulf or eastern pacific ocean 3. winter storm with snow and strong winds or a DQ TREAT 4. an intense tropical storm with winds exceeding 119 knots, Irma was one 5. air masses that form form in the tropics and are hot and dry 7. when a slow moving front blocks a faster one these occur 9. yogi trips or you work 10. system of air with high pressure at the center and lower on the outside 11. known for lightning and thunder 13. what science is and always will be 14. large bodies of air that uniform temperature , humidity and pressure 15. when a front stalls for several days in its moveent it becomes this 16. violent whilrling column of air that took Dorthy to Oz