| A | B |
|---|
| weather | state of the atmosphere at a specific time and place; determined by factors including air pressure, amount of moisture in the air, temperature and wind. |
| humidity | amount of water vapor in the air |
| relative humidity | measure of the amount of moisture held in the air compared with the amount i can hold at a given temperature; can range from zero percent to 100 percent |
| dew point | temperature at which air is saturated and condensation forms |
| fog | a stratus cloud that forms when air is cooled to its dew point near the ground |
| precipitation | water falling from clouds, including rain, snow, sleet, and hail, whose form is determined by air temperature |
| air mass | large body of air that has the same characteristics of temperature and moisture content as the part of Earth's surface over which it is formed |
| front | boundary between two air masses with different temperatures, density, or moisture; can be cold, warm, occluded, and stationary |
| tornado | violent, whirling windstorm that crosses land in a narrow path and can result from wind shears inside a thunderhead |
| hurricane | large, severe storm that forms over tropical oceans, has winds of at least 120km/h, and loses power when it reaches land |
| blizzard | winter storm that lasts at least 3h with temperatures of -12C or below, poor visibility, and winds of at least 51km/h |
| meteorologist | studies weather and uses information from Doppler radar, weather satellites, computers and other instruments to make weather maps and provide forecasts |
| station model | indicates weather conditions at a specific location, using a combination of symbols on a map |
| isotherm | line drawn on a weather map that connects points having equal temperature |
| isobar | lines drawn on a weather map that connect points having equal atmospheric pressure; also indicate the location of high and low pressure areas and can show wind speed. |
