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Across 6. a form of precipitation consisting of ice pellets, often mixed with rain or snow. 9. the process of turning from liquid into vapor 10. the emission of energy as electromagnetic waves or as moving subatomic particles, 13. a form of energy that is reflected or emitted from objects in the form of electrical and magnetic waves that can travel through space 15. pair of air masses, neither of which is strong enough to replace the other. On a weather map, this is shown by an inter-playing series of blue spikes pointing one direction and red domes pointing the other. 19. the SI base unit of thermodynamic temperature, equal in magnitude to the degree Celsius. 20. formed by condensation of atmospheric water vapor and suspended in the atmosphere with other drops to form a cloud 22. water that collects as droplets on a cold surface when humid air is in contact with it. 23. a cyclone in the middle or high latitudes often containing a cold front that extends toward the equator for hundreds of miles. 24. Continental Arctic 27. the process by which heat or electricity is directly transmitted through a substance 30. make or become liquefied by heat. 31. a composite front produced by occlusion. 32. the layer of the earth's atmosphere that contains a high concentration of ions and free electrons and is able to reflect radio waves. 35. air masses are cool, moist, and unstable 39. the amount of water vapor present in air expressed as a percentage of the amount needed for saturation at the same temperature. 40. symbolic illustrations showing the weather occurring at a given reporting station 41. below 32°F (0°C). 44. The boundary between two air masses that have different temperatures or humidity. 46. low-level clouds characterized by horizontal layering with a uniform base, 47. of or denoting a scale of temperature on which water freezes at 32° and boils at 212° under standard conditions 50. a visible mass of condensed water vapor floating in the atmosphere, typically high above the ground 51. name given to rain that falls when surface temperatures are below freezing 52. the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise 53. a storm with a violent wind, in particular a tropical cyclone in the Caribbean. 54. one thousandth of a bar, 55. the heat required to convert a solid into a liquid or vapor, or a liquid into a vapor, without change of temperature. 56. a breeze blowing toward the land from the sea 57. the region of the atmosphere above the mesosphere 58. of or denoting a scale of temperature in which water freezes at 0° and boils at 100°

Down 1. the outermost region of a planet's atmosphere 2. a line on a map connecting points having the same atmospheric pressure at a given time or on average over a given period. 3. ing according to pressure and humidity) below which water droplets begin to condense and dew can form. 4. originate over the warm waters of the tropics and Gulf of Mexico 5. a thick cloud of tiny water droplets suspended in the atmosphere at or near the earth's surface that obscures or restricts visibilit 7. pellets of frozen rain that fall in showers from cumulonimbus clouds. 8. a dry air mass formed over land in area close to the equator. 11. the region of the earth's atmosphere above the stratosphere and below the thermosphere 12. are small particles typically 0.2 µm, or 1/100th the size of a cloud droplet on which water vapor condenses 14. the layer of the earth's atmosphere above the troposphere, extending to about 32 miles (50 km) above the earth's surface 16. an instrument measuring atmospheric pressure 17. rain, snow, sleet, or hail that falls to the ground. 18. the boundary in the earth's atmosphere between the mesosphere and the thermosphere, 20. an effect whereby a mass moving in a rotating system experiences a force... 21. Polar Air Masses cold temperatures and little moisture 25. an instrument for measuring the speed of the wind, 26. a system of winds rotating inward to an area of low atmospheric pressure 28. an expert in or student of meteorology; a weather forecaster. 29. the branch of science concerned with the processes and phenomena of the atmosphere, especially as a means of forecasting the weather. 33. a breeze blowing toward the sea from the land 34. the calm region at the center of a storm or hurricane 36. a narrow, variable band of very strong, predominantly westerly air currents encircling the globe several miles above the earth. 37. the boundary of an advancing mass of cold air, 38. moisture condensed from the atmosphere that falls visibly in separate drops. 40. the interface between the stratosphere and the ionosphere. 42. atmospheric water vapor frozen into ice crystals and falling in light white flakes or lying on the ground as a white layer. 43. a hygrometer consisting of a wet-bulb and a dry-bulb thermometer, 45. a device for collecting and measuring the amount of rain that falls 48. dense, towering vertical cloud associated with thunderstorms 49. a body of air with horizontally uniform temperature, humidity, and pressure.