- Industry: Weather
- Number of terms: 60695
- Number of blossaries: 0
- Company Profile:
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 system for measuring the small pressure variations associated with sound waves below the range of human hearing (< 20 Hz). Such systems are currently being evaluated for meteorological applications (e.g., tornado detection).
Industry:Weather
A surface in space on which the value of a given quantity is everywhere equal. Isotimic surfaces are the common reference surfaces for synoptic charts, principally constant- pressure surfaces and constant-height surfaces.
Industry:Weather
A surface in space on which entropy (or, in meteorology, potential temperature) is everywhere equal; a constant-entropy surface.
Industry:Weather
A subtle diurnal component of the wind velocity leading to a diurnal shift of the wind or turning of the wind with the sun, produced by the east-to-west progression of daytime surface heating.
Industry:Weather
A sublayer in wall-bounded shear flows characterized by a sufficiently large Reynolds number and a logarithmic velocity profile (e.g., the atmospheric surface layer); so called as an analogy with the inertial subrange of the turbulence kinetic energy (TKE) spectrum, where viscosity provides a sink for momentum as dissipation provides a sink for TKE in the inertial subrange.
Industry:Weather
A strong cold northeasterly wind blowing down into the Eden valley from the western slope of the Crossfell Range (893 m or 2930 ft) in northern England. Beyond the stormy northeasterly flow, there is a belt of calm on either side of which may be a light westerly wind. The helm wind occurs when the general direction of the wind is between north-northeast and east. A line of cloud (the helm) forms along the crest of the ridge, and above the calm belt a narrow, nearly stationary roll of cloud (the helm bar) rotates about a horizontal axis parallel to the helm bar. It may occur in any month but is most frequent in winter and spring.
Industry:Weather
A stream that carries water a considerable portion of the time, but that ceases to flow occasionally or seasonally because bed seepage and evapotranspiration exceed the available water supply. Compare ephemeral stream, perennial stream.
Industry:Weather
A stream that contains stretches of both perennial and intermittent flow.
Industry:Weather
