20 terms

UAS 206

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Advection Fog
Fog produced by the flow of moist air along upward sloping terrain
Atmospheric Stability
A measure of the atmosphere's tendency to encourage or deter vertical motion
Cumulus Stage
Warm, moist air rises in a buoyant plume or in a series of convective updrafts; as this occurs the air begins to condense into a cumulus cloud
Density Altitude
Air density given as a height above mean sea level
Dew Point
The atmospheric temperature (varying according to pressure and humidity) below which water droplets begin to condense and dew can form
Dissipating Stage
When the downdrafts in the cloud begins to dominate over the updraft, since warm moist air can no longer rise, cloud droplets can no longer form
Humidity
A quantity representing the amount of water vapor in the atmosphere
Lenticular Cloud
A lens-shaped cloud that normally develops on the downwind side of a mountain or mountain range
Mature Stage
The middle and most intense phase in the life cycle of a thunderstorm cell; begins when precipitation reaches Earth's surface and is characterized by both updrafts and downdrafts
Microburst
A sudden, powerful, localized air current, especially a downdraft
Nimbus
Grey rain cloud
Precipitation Fog
Forms as precipitation falls into drier air below the cloud, the liquid droplets evaporate into water vapor
Radiation Fog
An evening fog over damp grounds or valleys resulting from cooling by radiation
Standard Day
59 °F and 29.92" Hg (temperature and inches of mercury)
Steam Fog
Fog which is formed when very cold air moves over warmer water
Temperature Inversion
Cold air underlies warmer air at higher altitudes
Upslope Fog
Fog produced by the flow of moist air along upward sloping terrain
Wind Shear
A change in wind speed and/or direction over a short distance
Ceiling
The highest level in the atmosphere from which the earth's surface is visible at a particular time, usually the base of a cloud layer
METAR
Stands for Meteorological Terminal Aviation Routine; meteorological reports that are generated every half hour to 1 hour depending on the location