- 行业: Weather
- Number of terms: 60695
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The American Meteorological Society promotes the development and dissemination of information and education on the atmospheric and related oceanic and hydrologic sciences and the advancement of their professional applications. Founded in 1919, AMS has a membership of more than 14,000 professionals, ...
Referring to the balance, in the atmosphere, between the horizontal Coriolis forces and the horizontal pressure forces. See geostrophic wind, geostrophic equilibrium, geostrophic balance.
Industry:Weather
Radar echoes from trees, buildings, or other objects on the ground. Such echoes may be caused by the reflection of energy back to the radar in the main lobe or sidelobes of the antenna pattern and, in weather radar applications, interfere with the meteorological echoes at the same range.
Industry:Weather
Rain that falls in liquid form but freezes upon impact to form a coating of glaze upon the ground and on exposed objects. In aviation weather observations, this hydrometeor is encoded ZR. While the temperature of the ground surface and glazed objects is typically near or below freezing (0°C or 32°F), it is necessary that the water drops be supercooled before striking. Freezing rain can sometimes occur on surfaces exposed to the air (such as tree limbs) with air temperatures slightly above freezing in strong winds. Local evaporational cooling may result in freezing. Freezing rain frequently occurs, therefore, as a transient condition between the occurrence of rain and ice pellets (sleet). When encountered by an aircraft in flight, freezing rain can cause a dangerous accretion of clear icing.
Industry:Weather
Rapid collection of whole-air samples into a suitable container, such as an evacuated canister or a polytetrafluoroethylene (PTFE) bag.
Industry:Weather
Physiological damage to plants and plant tissues during occurrences of frost with temperatures generally below 3°C.
Industry:Weather
Processing method in a rule-based expert system that begins by identifying a chain of true rules that lead to a conclusion. Compare backward chaining.
Industry:Weather
Particles occurring in the atmosphere with diameters less than 2 μm. This size range includes Aitken nuclei and particles in the accumulation mode.
Industry:Weather
Pattern of alternating temperatures from above to below freezing causing freezing and thawing of upper soil layer, often resulting in damage to plant root systems, particularly small winter grains, most commonly observed with soils near saturation in surface layers.
Industry:Weather
