Weather and Climate

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Across
  1. 3. A climatic type found in the interior of landmasses (11)
  2. 6. A tall thunder-cloud shaped like an anvil at the top (12)
  3. 7. It occurs on March 20 and September 22 (7)
  4. 9. Conversion of water to water vapour (11)
  5. 10. A kind of precipitation consisting of white flakes (4)
  6. 11. A unit of measurement of temperature (7)
  7. 13. Transmission of snow or rain from the atmosphere to the ground (13)
  8. 15. Type of rainfall caused by rising thermal currents (12)
  9. 18. Loss of heat energy by an object (9)
  10. 21. Type of rainfall caused by air rising over hills (6)
  11. 22. Type of rainfall caused when one air mass rises over another (8)
  12. 23. Very fine rain (7)
  13. 24. A type of climate influenced strongly by the sea (8)
  14. 26. Puffy white cloud (7)
  15. 27. A scale for measuring wind speed (8)
  16. 28. High-level cloud composed of ice crystals (6)
  17. 32. A line joining points of equal barometric pressure (6)
  18. 33. The study of weather (11)
  19. 36. A layer of gases around the Earth (10)
  20. 39. Moisture content of air (8)
  21. 41. June 21 and December 21 are examples (8)
  22. 42. A very strong wind (4)
Down
  1. 1. Crystallisation of ice on solid objects (5)
  2. 2. Boundary between to contrasting air masses (5)
  3. 3. Change from water vapour to water droplets (12)
  4. 4. A device used to measure wind speed (10)
  5. 5. Movement of air (4)
  6. 8. Part of a depression which contains tropical air (4,6)
  7. 12. The layer of the atmosphere below 10,000 metres where weather occurs (11)
  8. 14. A measurement of heat in an environment (11)
  9. 16. Energy from the sun transmitted through space (10)
  10. 17. An area of high atmospheric pressure (11)
  11. 19. Sound generated by rapidly expanding air around a lightning fork (7)
  12. 20. A mixture of snow and rain (5)
  13. 25. A body of air with properties inherited from its source region (3,4)
  14. 27. A gentle wind (6)
  15. 29. A line joining points of equal temperature (8)
  16. 30. Type of energy originating in the sun (5)
  17. 31. An area of low atmospheric pressure (10)
  18. 34. Units for recording cloud cover (5)
  19. 35. An ice pellet formed by turbulence inside a cloud (9)
  20. 37. Layer cloud which may create overcast conditions (7)
  21. 38. Tropical cyclone affecting Caribbean (9)
  22. 40. Cloud at ground level (3)