| A | B |
|---|
| weather | present state of the atmosphere, including air pressure, wind, temperature, and the amount of moisture in the air. |
| humidity | amount of water vapor held in the air. |
| relative humidity | measure of the amount of water vapor that the air is holding compared to the amount it can hold at a specific temperature. |
| dew point | temperature at which the air is saturated and condensation forms; changes with the amount of moisture in the air. |
| fog | stratus cloud that forms when air is cooled to its dew point and condenses near the ground. |
| precipitation | water falling from clouds, including rain, snow, sleet, and hail. |
| air mass | large body of air that has the same properties as the Earth's surface over which it formed. |
| front | boundary between warm and cold air masses. |
| tornado | violent, whirling wind that moves in a narrow path over land,forms a funnel, and can reach up to 500 km per hour and be highly destructive. |
| Doppler Radar | specialized radar system that sends out repeated radio waves, monitors the reflected waves from distant storms, and can tell the direction a storm is moving. |
| hurricane | large, swirling, low-pressure system that forms over tropical oceans and has winds at least 120 km per hour . |
| meteorologist | person who studies the weather, takes measurements of temperature, air pressure, winds, humidity, and precipitation, and uses information provided by weather instruments to make weather maps and forecasts. |
| station model | shows the weather conditions at one specific location,using symbols on a map. |
| isotherm | line drawn on a weather map that connects points of equal temperature. |
| isobar | line drawn on a weather map that connects points of equal atmospheric pressure. |
