| A | B |
|---|
| Air mass | a large body of air that has properties similar to the part of the Earth over which it forms. |
| Climate | the average weather pattern in an area over a long period of time. |
| Climate regions | divisions of the Earth's climates into general zones according to average temperatures and average rainfall. |
| Doppler radar | a device that is used to detect cloud cover, rainfall or storm location, intensity, and movement, as well as the potential for severe weather (for example, hurricanes or tornadoes). |
| Front | a boundary between two air masses of different temperature, moisture, or density. |
| Humidity | the amount of water vapor (moisture) in the air. |
| Isobar | a line of constant pressure on a weather map. |
| Isotherm | a line of constant temperature on a weather map. |
| Meteorologist | a person who studies day-to-day weather. |
| Relative humidity | the amount of water vapor in the air as a percentage of the maximum amount of water vapor the air could hold at that temperature. |
| Station model | a combination of symbols that shows the weather conditions at a specific location on Earth’s surface. |
| Surface ocean currents | convection currents that circulate warm and cold ocean waters which influence the weather and climates of the land masses nearby. |
| Weather | the condition of Earth’s atmosphere at any given time. |
| Weather map | a diagram which shows information gathered from station models, satellites, and radar that is used to forecast weather |
| Weather satellite | a device that orbits earth and is used to detect cloud patterns and movement; useful for detecting fronts and for tracking the movement of hurricanes. |
