Shelf cloud anvil cloud12/30/2023 ![]() ![]() See cumuliform anvil, knuckles, mushroom. ![]() A circular or semicircular lip of clouds along the underside of the upwind part of a back-sheared anvil, indicating rapid expansion of the anvil. They typically appear during the weakening or dissipating stage of the parent thunderstorm or during an active mesoscale convective system. A lightning discharge occurring within the anvil of a thunderstorm, characterized by one or more channels that appear to crawl along the underside of the anvil. Its glaciated top spreads out horizontally upon reaching the tropopause or by the action of the winds aloft. The process in which solid precipitation particles combine in the atmosphere to produce larger particles, such as hailstones.Ī cirriform cloud with an anvil shape, which forms the upper part of a well-developed Cumulonimbus. The process in which precipitation particles grow by collision with, and by assimilation of, cloud particles or other precipitation particles. Regarding the general distinction between advection and convection, the former describes the predominantly horizontal, large-scale motions of the atmosphere or ocean, while convection describes the predominantly vertical, locally induced motions. temperature, chemical tracers) by the motion of the fluid. Transport of water or air along with its properties (e.g. Growth of a cloud or precipitation particle by the collision and union of a frozen particle (ice crystal or snowflake) with a supercooled liquid droplet which freezes on impact. The following terms were sourced from the documents indicated at the end of this glossary, sometimes with minor modification, or directly from WMO experts. ![]()
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