science 4.4
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14 terms
Terms | Definitions |
|---|---|
 air mass | A huge body of air that has similar temperature, humidity, and air pressure at any given height. |
| tropical | A warm air mass that forms in the tropics and has low air pressure. |
| polar | A cold air mass that forms north of 50 degrees north latitude or south of 50 degrees south latitude and has high air pressure. |
| maritime | A humid air mass that forms over oceans. |
| continental | A dry air mass that forms over land. |
| jet streams | Bands of high-speed winds about 10 kilometers above Earth 's surface. |
| front | The boundary where unlike air masses meet but do not mix. |
| occluded | Cut off, as in a front where a warm air mass is caught between two cooler air masses. |
| cyclone | A swirling center of low air pressure. |
| anticyclone | A high pressure center of dry air. |
| cold front | cold air is dense and sinks, warm air is less dense and rises; the denser cold air slides under the lighter warm air; brings clouds and heavy precipitation |
| occluded front | A warm air mass is caught between two cooler air masses; brings clouds and precipitation |
| stationary front | A stalled front that may bring many days of clouds and precipitation. |
| warm front | Fast moving warm air overtakes slower cold air mass; brings clouds and many days of precipitation |
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