5th grade weather unit
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23 terms
Terms | Definitions |
|---|---|
 jet stream | A narrow band of strong winds in the upper troposhere layer of the atmosphere |
| air mass | a body of air which has the same characteristics of temperature and moisture |
| atmosphere | the layer of gases (air) surrounding the earth |
| anemometer | an instrument that measures the speed of the wind |
| air pressure | force exerted by the weight of the air |
| barometer | an instrument to measure air pressure |
| front | a line or boundary between two air masses having different temperature |
| wind vane | an instrument that measures wind direction |
| cold front | a boundary between two air masses, one cold and the other warm, moving so that the colder air replaces the warmer air |
| meteorologist | a scientist that studies the atmosphere and weather |
| weather | the condition of the atmosphere at a certain time |
| warm fronts | usually move slower than a cold front, warm air rises over the cold air pushing it away, brings lighter rain that can last for a few days, brings in warmer weather |
| stationary front | cold and warm air masses not moving |
| three conditions to make clouds | water vapor from the air, water vapor cools and condenses and attaches to dust, pollen or salt |
| cirrus | high, thin whispy clouds formed from ice crystals, usually with clear weather |
| cumulus | cotton ball types of clouds |
| stratus | blanket type clouds that can cover the sky. Can often be rain clouds |
| condensation | water vapor changing to the liquid state |
| dew point temperature | the temperature at which water starts to condense out of an air mass |
| winds | move air masses |
| high pressure | clear weather, sunny low energy, molecules tightly packed |
| low preassure | clouds, stormy, rain, high energy, air molecules spread out |
| isobars | a line on a weather map connecting equal points of pressure |
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