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DISCONTINUITY- A rapid change of a meteorological parameter over distance. A frontal boundary is an example of a discontinuity.

discontinuity—A zone with comparatively rapid transition of one or more meteorological elements.

Comparatively large contrast in meteorological elements over a relatively small distance or period of time. In oceanography, it is the abrupt change or jump of a variable at a line or surface.

The line of discontinuity, which is developed in suitable conditions between air originating from polar regions and air from low latitudes, and on which the majority of the depressions of temperate latitudes develop.

jump - 1. A discontinuity in a function or a derivative of a function such that it assumes different values at a point when the point is approached from different directions. 2. See pressure jump.

Cold Front-The discontinuity at the forward edge of and advancing cold air mass that is displacing a warmer and often higher in moisture air mass.

The Polar Front Jet: As its name implies, this jet stream is associated with the marked discontinuity found at the boundary of well defined air masses - polar to the north/sub tropical to the south (in the northern hemisphere), conventionally found at the polar front.

Fresnel Reflection The reflection of a radar signal from a single, dominating discontinuity of the refractive index, usually with a large horizontal extent.

Front - A narrow transition zone, or boundary, between disparate synoptic scale air masses whose primary discontinuity is density. Fronts are commonly associated with a moisture gradient, a pressure trough, a wind shift and/or various sensible weather phenomena. A front is a convergent boundary.

Tropical cyclones occasionally evolve into extratropical lows losing tropical characteristics and become associated with frontal discontinuity. Extreme Ultraviolet (EUV)A portion of the electromagnetic spectrum from approximately 100 to 1000 angstroms.

See also: See also: Meteor, Pressure, Energy, Temperature, Wind

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