Earth & Space Science set #8
About this set
Created by:
DrWhoIsCool on March 20, 2012
Description:
weather
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19 terms
Terms | Definitions |
|---|---|
 Expansional Cooling | a temperature drop that accompanies a pressure reduction on an air parcel, as when air parcels rise within the atmosphere. |
| Front | a boundary that exists between air masses with different temperatures and/or water vapor concentrations. |
| Air Mass | a large volume of air with uniform temperature and water vapor concentrations. |
| Cold Front | a boundary in which a cold air mass is overtaking a warm air mass. |
| Warm Front | a boundary in which a warm air mass is over taking a cold air mass. |
| Stationary Front | a nearly motionless boundary between a cold air mass and a warm air mass. Winds blow parallel to the front, but in opposite directions on the two sides of the front. |
| Occluded Front | a boundary that forms when a cold front overtakes a warm front. |
| Dew Point | the temperature above freezing to which air must be cooled to reach saturation. |
| Frost Point | the temperature below freezing to which air must be cooled to reach saturation. |
| Saturation | a state in which the air is "holding" all of the water that it can take at a given temperature. |
| Orographic Lifting | a process by which air reaches saturation by being forced up and over mountains. |
| Convectional Cooling | when air reaches saturation because it has been heated and it rises because it's density has been reduced. |
| Cloud | a visible mass of water droplets or ice crystals that are suspended in an air layer that is NOT in contact with the ground. |
| Fog | a visible mass of water droplets or ice crystals that are suspended in an air layer that has contact with the ground. |
| Radiation Fog | a ground level cloud formed by nighttime radiational cooling of a humid air layer. Common on clear nights with light winds over damp areas such as rain soaked fields or wetlands. |
| Advection Fog | a ground level cloud formed when a moist, warm, air mass moves over a cold surface like a snow pack, a lake, or an ocean. |
| Steam Fog | a general name for a ground level cloud that forms when cold air comes in contact with relatively warm water. |
| Dew | water droplets formed by condensation of water vapor on a relatively cold surfaces like grass, cars, etc. |
| Frost | ice crystals formed by sublimation of water vapor on a relatively cold surface like grass, cars, etc. |
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