1. 4. A violent disturbance in the atmosphere
  2. 6. Cut off, as in a front where a warm air mass is caught between two cooler air masses
  3. 7. barometer, An instrument that measures changes in air pressure without using a liquid
  4. 12. The process by which molecules at the surface of a liquid absorb enough energy to change to a gas
  5. 15. The amount of water vapor in a given volume of air
  6. 16. A warm air mass that forms in the tropics and has low air pressure
  7. 18. breeze, The flow of air from land to a body of water
  8. 19. A tropical storm that has winds of about 119 kilometers per hour or higher
  9. 22. A sudden spark, or energy discharge, caused when electrical charges jump between parts of a cloud, between nearby clouds, or between a cloud and the ground
  10. 23. The change of state from a gas to a liquid
  11. 25. A cold air mass that forms north of 50 degrees north latitude or south of 50 degrees south latitude and has high air pressure
  12. 29. A high-pressure center of dry air
  13. 32. A line on a weather map that joins places that have the same temperature
  14. 33. An instrument used to measure relative humidity
  15. 34. barometer, An instrument that measures changes in air pressure, consisting of a glass tube partially filled with mercury, with its open end resting in a dish of mercury
  16. 37. A swirling center of low air pressure
  17. 38. breeze, The flow of cooler air from over an ocean or lake toward land
  18. 39. stream, Bands of high-speed winds about 10 kilometers above Earth’s surface
  1. 1. The horizontal movement of air from an area of high pressure to an area of low pressure
  2. 2. A humid air mass that forms over oceans
  3. 3. An instrument used to measure wind speed
  4. 5. Elevation above sea level
  5. 8. The ratio of the mass of substance to its volume
  6. 9. An instrument used to measure changes in air pressure
  7. 10. A dry air mass that forms over land
  8. 11. effect, The effect of Earth’s rotation on the direction of winds and currents
  9. 13. surge, A “dome” of water that sweeps across the coast where a hurricane lands
  10. 14. A rapidly whirling, funnel-shaped cloud that reaches down to touch Earth’s surface
  11. 17. factor, A measure of cooling combining temperature and wind speed
  12. 18. The distance in degrees north or south of the equator
  13. 20. Scientists who study the causes of weather and try to predict it
  14. 21. Winds, Winds that blow steadily from specific directions over long distances
  15. 24. A small storm often accompanied by heavy precipitation and frequent thunder and lightning
  16. 26. A line on a weather map that joins places that have the same air pressure
  17. 27. Pressure, The pressure caused by the weight of a column of air pushing down on an area
  18. 28. humidity, The percentage of water vapor in the air compared to the maximum amount of water vapor that air can contain at a particular temperature
  19. 30. Moving away temporarily from an area about to be affected by severe weather
  20. 31. cycle, The continual movement of water among Earth’s atmosphere, oceans, and land surface through evaporation, condensation, and precipitation
  21. 35. Winds, Winds that blow over short distances
  22. 36. The boundary where unlike air masses meet but do not mix