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GreenfieldMeteor3
Weather and Meteorology
| Term | Definition |
|---|---|
| Isotherms | lines on a weather map connecting locations that have equal temperatures |
| Precipitation | water that falls from the sky as rain , snow, sleet, or hail |
| Evaporation | The change in a substance from a liquid to a gas by the addition of energy (heat) |
| Condensation | the change in a substance from a gas to a liquid by a change in temperature |
| Condensation nuclei | small particles of dirt and dust on which water vapor condenses and eventually gather to produce clouds |
| Cirrus | type of cloud forming wispy feathery streaks at high altitude |
| Cumulus | type of cloud forming rounded masses heaped on each other above a flat base at |
| Coriolis effect | The apparent deflection of a freely moving object like water or air because of earths rotation |
| Cyclone | a wind system that rotates ounterclockwise around a low pressure center |
| Saturated | the state of the atmosphere in which air contains the maximum amount of water vapor that it can hold at a specific temperature and air pressure. Represents 100% relative humidity. |
| Stratus | type of cloud forming a continuous horizontal gray sheet or blanket, often with rain or snow |
| Stationary front | a stalled front in which the air does not move; may cause several days of overcast or rain |
| Storm surge | a sudden rising of the sea as a result of atmospheric pressure changes and winds associated with a storm |
| Humidity | the amount of water vapor held in the air |
| Dew point | the temperature at which air is saturated with water vapor; when it has 100% humidity |
| Polar easterlies | dry ,cold prevailing global winds that blow from the high-pressure areas of the polar regions at the north and south poles toward low-pressure areas within the westerlies at high latitudes |
| Weather front | a boundary separating two masses of air of different densities and temperature, and is the principal cause of meteorological phenomena such as storms |
| Westerlies | the belt of global, prevailing westerly winds in the mid-latitudes of the northern and southern hemisphere; These move weather in the USA |
| Air pressure | the force of air pressing on a given area |
| Anti-cyclone | a wind system that rotates clockwise around a high pressure center |
| Anemometer | an instrument used for measuring the speed of wind, or of any current gas |
| Air mass | a large mass of air with the same density, temperature and humidity characteristics |
| Barometer | an instrument used for measuring atmospheric pressure |
| Jet stream | a fast-flowing "river" or current of air in the atmosphere, where air masses with two very different sets of temperature and humidity characteristics move past each other. There are two in each hemisphere |
| Trade winds | a global wind blowing steadily toward the equator from the northeast in the northern hemisphere or from the southeast in the southern hemisphere, especially at sea |
| El Nino | a natural climate variation lasting 1-2 years which causes a shft in wind and weather patterns on the ocean surface off of South America leading to unusual and often severe conditions in the US |
| Occluded front | a front in which a warm air mass becomes caught between 2 cooler air massses, gets pushed up, and as it cools the water vapor within condenses causing clouiness with possible rain or snow |
| Isobars | Lines on a weather map connecting areas of similar air pressure |
| Relative humidity | The percentage of water vapor that is actually in the air compared to the maximum amount of water vapor the air can hold at a particular temperature. |
Created by:
pattigreenfield
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