An upper air observation used to determine winds, and other meteorological data, by tracking the range, elevation, and azimuth of a radar target carried aloft . A type of rawinsonde. In Doppler radar, it is the component of motion that is parallel to the radar beam. The process by which energy is propagated through any medium by virue of the wave motion of that medium. Electromagnetic radiation, which emits heat and light, is one form.
Sound waves are another.
The cooling of the earth's surface and the adjacent air. Although it occurs primarily at night, it happens when the earth's surface suffers a net loss of heat due to outgoing radiation. See terrestrial radiation. Formation is best when there is a shallow surface layer of relatively moist air beneath a drier layer, clear skies, and light surface winds. This primarily occurs during the night or early morning.