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| Question | Answer |
|---|---|
| Air Mass | a huge bodyof air that has similar temperature,humidity,and air pressure at any given height. |
| Maritime Tropical | warm,humid air masses form over the Gulf of Mexico and Atlantic oceans. |
| Maritime Polar | cool,humid air masses form vover the icy cold North Pacificand Pacific and North Atlantic oceans. |
| Continental Tropic | hot,dry,air masses, from mostly in summer over dry areas of the Southwest and northen Mexico. |
| Continental Polar | from over central and nothern Canada and alaska,bring bitterly cold weather with very low humidity. |
| Prevailing Westerlies | major wind bel over the continental United States pushing air masses from west to east. |
| Jet Streams | bands of high-speed winds about 10 kilometers above Earth's surface,blow from west to east carry air masses |
| Fronts | When two different air masses collide, the warmer, less dense will go on top with the cooler, denser going on bottom. These air masses do not mix well. The boundary where the air masses meet becomes a front. |
| Cold Fronts | When a rapidly moving cold air mass runs into a slowly moving warm air mass, the denser cold air slides under the lighter warm air. The warm air is pushed upward along the edge of the colder air and forms a cold front. |
| Warm Front | a fast moving warm air mass overtakes a slower moving cold air mass. If the warm air is humid, light rain or snow could fall. If the warm air is dry, scattered clouds form. Because warm fronts move slowly, cloudy or rainy weather could last for several |
| Stationary Fronts | Sometimes cold and warm air masses meet, but neither one will move and face each other in a "standoff". This is called a stationary front because it will not move and may bring days of clouds and precipitation. |
| Occluded Fronts | a warm air mass is caught between to cold air masses. The two cooler air masses meet in the middle and push the less dense warm air mass upward. This will result in cooler temperature. |
| Cyclones | a swirling center of low pressure. Winds spiral inward towards the lower-pressure center of the cyclone. Cyclones play a large part in the weather in the United States. Cyclones and decreasing air pressure are associated with clouds, wind, and precipita |
| Anticyclones | high pressure centers of dry air; winds spiral outward from the high-pressure center of an anticyclone. High pressure systems are marked with an H. The descending air in an anticyclone generally causes dry, clear weather. |
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