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| isotherm | Line drawn on a weather map that connects points of equal temperature. |
| meteorologist | A person who studies weather, takes measurements of temperature, air pressure, winds, humidity, and precipitation, and uses information provided by weather instruments to make weather maps and forecasts. |
| precipitation | Water falling from clouds, including rain, snow, sleet and hail. |
| relative humidity | The measure of the amount of water vapor that the air is holding compared to the amount it can hold at a specific temperature. |
| station model | Shows the weather conditions at one specific locatin, using symbols on a map. |
| tornado | A 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. |
| weather | The present state of the atmosphere, including air pressure, wind, temperature, and the amount of moister in the air. |
| air mass | A large body of air that has the same properties as the Earth's surface over which it formed. |
| dew point | The temperature at which air is saturated and condensation forms; changes with the amount of moisture in the air. |
| 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. |
| fog | Stratus cloud that forms when air is colled to its dew point and condenses near the ground. |
| front | The boundary between warm and cold air masses. |
| humidity | The amount of water vapor held in the air. |
| hurricane | A large, swirling, low-pressure system that forms over tropical oceans and has winds of at least 120 km per hour. |
| isobar | A line drawn on a weather map that connects points of atmospheric pressure. |
