- 行业: Weather
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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 form of aircraft icing intermediate in all respects between clear ice and rime ice. It forms in the temperature range between −4° and −15°C.
Industry:Weather
A pressure unit of 1000 dynes cm<sup>−2</sup>, convenient for reporting atmospheric pressures. The millibar does not fit into any commonly employed system of physical units. One millibar equals one hectopascal.
Industry:Weather
In meteorology, commonly applied to pressure systems embedded in the westerlies and, therefore, moving in a general west-to-east direction.
Industry:Weather
1. A unit of angular measurement, sometimes used in radar antennas, equal to 1/6400 of the circumference of a circle. 2. A unit of length, equal to 0. 001 in. , used in measuring the diameter of wire.
Industry:Weather
A warm, moist sea breeze from the south that sets in at midday in Provence, France, south of Mount Ventoux. In the Roussillon region the midday south wind (mitgjorn) is irregular and generally light, and is dry after crossing the Pyrenees.
Industry:Weather
The portion of the electromagnetic spectrum lying between the near-infrared and the far infrared. This covers the wavelength range approximately from 4 to 15 μm, but usage varies. See also thermal infrared.
Industry:Weather
A tropical cyclone with a radius to the outermost closed isobar of 100– 200 km. These cyclones can support hurricane-force winds with central pressures significantly higher than larger storms.
Industry:Weather
In Germany, a local wind from the south that sets in regularly, under anticyclonic conditions, over the Upper Bavarian lakes Würm and Ammer, soon after midnight. It is a mountain wind due to nocturnal radiation and reaches a velocity of only 1–2 m s<sup>−1</sup> (3–4 mph).
Industry:Weather
Method for computing the discharge of a stream by dividing the cross section by verticals into sections. The total discharge is the sum of the products of the average velocity in each vertical by the depth of that vertical and by the mean width of the two adjacent sections.
Industry:Weather
Electromagnetic radiation generally in the frequency range between 300 MHz and 300 GHz (free-space wavelengths between 1 and 1000 mm). Within these frequencies lie the UHF, SHF, and EHF radio frequency bands. Radars operate at microwave frequencies.
Industry:Weather
