| A | B |
|---|
| air mass | large body of air with uniform temperature and moisture content |
| anemometer | instrument used to measure wind speed |
| anticyclone | storm that spirals outward from a high-pressure center |
| bimetal thermometer | instrument used to measure temperature, consisting of a bar made of two strips of different metals that curves when heated and straigntens when cooled |
| cold front | boundary formed where a cold air mass overtakes and lifts a warm air mass |
| continental polar | describing a cold, dry air mass that forms over land in polar regions |
| continental tropical | describing a warm, dry air mass that forms over land in tropical regions |
| electrical thermometer | instrument used to measure temperature based on the increased flow of electricity through certain materials when the materials are heated |
| front | boundary between air masses of different densities |
| hurricane | severe storm that develops over tropical oceans, with strong winds of over 120 km/h that spiral in toward the intensely low-pressured atrom center |
| isobar | line drawn on a weathr map connecting points of equal atmospheric pressure |
| maritime polar | describing a cold, moist air mass that is formed over the ocean in polar areas |
| maritime tropical | describing a warm, moist air mass that is formed over the ocean in tropical areas |
| occluded front | boundary formed where a fast-moving cold air mass overtakes and lifts a warm air mass, completely cutting it off from the ground |
| polar front | boundary at which cold polar air meets the warmer air of the middle latitudes |
| radar | device that can detect objects and weather conditions in the upper atmosphere by sending and receiving radio waves |
| squall line | long line of heavy thunderstorms that may occur just ahead of a fast-moving cold front |
| station model | cluste of weather symbols plotted on a map indicating the weather conditions at a particular reporting station |
| stationary front | boundary formed where two air masses meet and neither is displaced |
| thermograph | instrument that measures temperature changes by recording the movement of the bar of a bimetal thermometer |
| thunderstorm | storm accompanied by thunder, lightning, and strong winds |
| tornado | whirling, funnel-chaped cyclone |
| typhoon | hurricane that forms over the western Pacific Ocean |
| warm front | boundary formed where a warm air mass overtakes and rises over a cold air mass |
| waterspout | tornado that occurs over the ocean |
| wave cyclone | large storm that develops along cold or stationary fronts, with winds that spiral in toward a central region of low air pressure |
| wind vane | instrument used to determine the direction of the wind |
