- 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, ...
A period of abnormally dry weather sufficiently long enough to cause a serious hydrological imbalance. Drought is a relative term, therefore any discussion in terms of precipitation deficit must refer to the particular precipitation-related activity that is under discussion. For example, there may be a shortage of precipitation during the growing season resulting in crop damage (agricultural drought), or during the winter runoff and percolation season affecting water supplies (hydrological drought). Compare dry spell; see absolute drought, partial drought.
Industry:Weather
A period of precipitation below a specified amount. The specific period and amount of precipitation vary depending on the particular activity under discussion.
Industry:Weather
Part of an obsolete conceptual model of air parcel ascent referring to that portion of the ascent during which the parcel is unsaturated. Other portions of the ascent were described as the rain stage, the snow stage, and the hail stage.
Industry:Weather
Solidified carbon dioxide that, at −78. 5°C and ambient pressure, changes directly to a gas as it absorbs heat. It is used as a coolant to induce the ice phase for supercooled cloud and fog modification procedures.
Industry:Weather
In certain types of climate, an annually recurring period of one or more months during which precipitation is at a minimum for that region; the opposite of rainy season.
Industry:Weather
The condition in the accretion of supercooled water droplets onto ice in which the temperature of the ice remains below the freezing point and the surface is mostly dry, except locally immediately after the drop collisions. The process of dry growth produces ice with many air cavities and bubbles, called rime. Compare wet growth; see hailstone.
Industry:Weather
The freezing of the soil and terrestrial objects caused by a reduction of temperature when the adjacent air does not contain sufficient moisture for the formation of hoarfrost on exposed surfaces. With respect to vegetation alone, this is termed a black frost. A dry freeze is usually considered to be a more local and short-period (probably radiative) phenomenon than a freeze.
Industry:Weather
