- Industry: Weather
- Number of terms: 60695
- Number of blossaries: 0
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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 small-scale front, formed in association with organized severe convective activity, between a mass of rain-cooled air from the thunderstorm clouds and the warm surrounding air. It may be the leading edge of a bubble high. See outflow boundary.
Industry:Weather
An onboard radar for determining the altitude of an aircraft above an underlying surface. Pulse-radar techniques measure altitude in terms of the transit time of the radar pulse; continuous-wave radar measures altitude in terms of the phase difference between the transmitted and received signals.
Industry:Weather
A small-scale front, formed in association with organized severe convective activity, between a mass of rain-cooled air from the thunderstorm clouds and the warm surrounding air. It may be the leading edge of a bubble high. See outflow boundary.
Industry:Weather
A chart indicating the change in atmospheric pressure of a constant-height surface over some specified interval of time; comparable to a height-change chart. See pressure tendency, isallobar, differential chart.
Industry:Weather
A transducer that converts electromagnetic radiation in the infrared, visible, and ultraviolet regions of the electromagnetic spectrum into electrical quantities such as voltage, current, or resistance. See photoelectric effect.
Industry:Weather
A system of curvilinear coordinates in which the position of a point in space is designated by its distance ''r'' from the origin or pole along the radius vector, the angle φ between the radius vector and a vertically directed polar axis called the cone angle or colatitude, and the angle θ between the plane of φ and a fixed meridian plane through the polar axis, called the polar angle or longitude. A constant-amplitude radius vector r confines a point to a sphere of radius ''r'' about the pole. The angles φ and θ serve to determine the position of the point on the sphere. The relations between the spherical coordinates and the rectangular Cartesian coordinates (''x'', ''y'', ''z'') are ''x'' = ''r'' cos θ sin φ; ''y'' = ''r'' sin θ sin φ; ''z'' = ''r'' cos φ.
Industry:Weather
A transducer that converts electromagnetic radiation in the infrared, visible, and ultraviolet regions of the electromagnetic spectrum into electrical quantities such as voltage, current, or resistance. See photoelectric effect.
Industry:Weather
The more or less irregular surface in the ground that marks the upper limit of the permafrost; not to be confused with frost table.
Industry:Weather
A method of testing for instability in which a displacement is made from a steady state under the assumption that only the parcel or parcels displaced are affected, the environment remaining unchanged. Although this method has been applied to various problems (e.g., inertial instability), its most familiar context is with vertical displacements from hydrostatic equilibrium, in which the parcel displaced is assumed to undergo adiabatic temperature changes, and the buoyant force resulting from its contrast with the unchanged environment leads to the criterion for stability, γ < Γ, where γ is the lapse rate of virtual temperature with height and Γ is the dry- or saturation-adiabatic lapse rate, according to the condition of the parcel. Compare slice method.
Industry:Weather
