There are 10 names in this directory beginning with the letter U.
Ultraviolet radiation
The energy range just beyond the violet end of the visible spectrum. Although ultraviolet radiation constitutes only about 5 percent of the total energy emitted from the sun, it is the major energy source for the stratosphere and mesosphere, playing a dominant role in both energy balance and chemical composition.
Updraft
A small- scale current of rising air. This is often associated with cumulus and cumulonimbus clouds.
Upper Level System
A general term for any large- scale or mesoscale disturbance capable of producing upward motion (lift) in the middle or upper parts of the atmosphere.
Upslope Flow
Air that flows toward higher terrain, and hence is forced to rise. The added lift often results in widespread low cloudiness and stratiform precipitation if the air is stable, or an increased chance of thunderstorm development if the air is unstable.
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Ultraviolet radiation
The energy range just beyond the violet end of the visible spectrum. Although ultraviolet radiation constitutes only about 5 percent of the total energy emitted from the sun, it is the major energy source for the stratosphere and mesosphere, playing a dominant role in both energy balance and chemical composition.
Updraft
A small- scale current of rising air. This is often associated with cumulus and cumulonimbus clouds.
Upper Level System
A general term for any large- scale or mesoscale disturbance capable of producing upward motion (lift) in the middle or upper parts of the atmosphere.
Upslope Flow
Air that flows toward higher terrain, and hence is forced to rise. The added lift often results in widespread low cloudiness and stratiform precipitation if the air is stable, or an increased chance of thunderstorm development if the air is unstable.