Electromagnetic radiation that has a wavelength shorter than visible light and longer than x-rays. Although it accounts for only 4 to 5 percent of the total energy of insolation, it is responsible for many complex photochemical reactions, such as fluorescence and the formation of ozone.
In aviation, it is an opaque cloud layer viewed from an observation point above the layer. From the ground, it would be considered an overcast.
UNITED STATES WEATHER BUREAU
The official name of the National Weather Service prior to 1970.
UNIVERSAL TIME COORDINATE
One of several names for the twenty-four hour time which is used throughout the scientific and military communities.
Related terms: Zulu (Z) and Greenwich Mean Time (GMT)
UNIVERSITY CORPORATION FOR ATMOSPHERIC RESEARCH (UCAR)
A non-profit university membership consortium which carries out programs to benefit atmospheric, oceanic, and related sciences around the globe. Among other activities, UCAR operates the National Center for Atmospheric Research (NCAR) with National Science Foundation sponsorship.
For further information, contact UCAR, located in Boulder, Colorado.
Occurs when a rising air parcel becomes less dense than the surrounding air. Since its temperature will not cool as rapidly as the surrounding environment, it will continue to rise on its own.
Related terms: instability and stable air
A small scale current of air with vertical motion. If there is enough moisture, then it may condense, forming a cumulus cloud, the first step towards thunderstorm development.
Related term: downdraft
UPPER AIR/UPPER LEVEL
The portion of the atmosphere which is above the lower troposphere. It is generally applied to the levels above 850 millibars. Therefore, upper level lows and highs, troughs, winds, observations, and charts all apply to atmospheric phenomena above the surface.
The cooling of an air flow as it ascends a hill or mountain slope. If there is enough moisture and the air is stable, stratiform clouds and precipitation may form. If the air is unstable, there might be an increased chance of thunderstorm development.
Related term: downslope effect
Fog that forms when warm, moist surface air is forced up a slope by the wind. It is adiabatically cooled to below its initial dew point, which means the air cools by expansion as it rises. It forms best where there is a gradual slope, and it can become quite deep, requiring considerable time to dissipate.
Related term: Cheyenne Fog
The process by which water rises from a lower to a higher depth, usually as a result of divergence and offshore currents. It influences climate by bringing colder, more nutrient-rich water to the surface. A vital factor of the El Nino event.
The direction from which the wind is blowing. Also the windward side of an object. The opposite of the downwind or leeward side.
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Internet portal on USA 2017. :: Internet Basics. Internet Service Providers. The Internet actually consists of five major services: World Wide Web (Web), Electronic Mail (E-mail), Newsgroups (Usenet), Internet Relay Chat (IRC), File Transfer Protocol (FTP).
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Chess portal on USA2017. :: Chess is the best game over the world. Chess makes your brain work good and your soul feel happy. Chess is taught to children in schools around the world today. Many schools host chess clubs, and there are many scholastic tournaments specifically for children. Tournaments are held regularly in many countries, hosted by organizations such as the United States Chess Federation and the National Scholastic Chess Foundation. I don't think about chess as a sport, for me chess is an art.