| A | B |
|---|
| weather | the condition of the Earth's atmosphere at a given time in a given place |
| meteorology | the scientific study of the Earth's weather |
| meteorologist | a person who studies the Earth's weather |
| air mass | large body of air that has the same properties as the surface it is over |
| relative humidity | amount of moisture in air compared to amount needed for saturation at a given temperature |
| water vapor | water that is always in the air |
| clouds | form when air cool and water vapor condenses on dust or other nuclei |
| tornado | violent, whirling wind associated with thunderstorms |
| front | boundary formed between two colliding air masses |
| dew point | temperature at which air is saturated and condensation begins |
| hurricane | severe storm that forms over tropical oceans |
| fog | stratus cloud that forms near the ground |
| forecast | a prediction about what kind of weather to expect |
| saturated | air holding all the moisture it can at a given temperature |
| precipitation | moisture condenses and falls to the earth as rain, snow, sleet or hail |
| weather factors | interaction of air, water and sun |
| stratus | low, layered gray clouds |
| lightning | results from build up of positive and negative electrical charges |
| sleet | raindrops that pass through a layer of freezing air |
| cold front | where violent storms often form |
| warm, moist air mass | forms off the southeast coast of US |
| wall cloud | a cumulonimbus cloud that often forms tornadoes |
