Cloud Features and Phenomena Definitions
Press the back button to return to the previous page
|Cumulonimbus Base Features
|A variety of features observed from below thunderstorms including feature such as scuds and precipitation. In most cases, the tops or sides of the thunderstorms are not in view.
|These photographs are related mostly to smoke from bushfires / wildfires and associated features. Bushfires vary in severity.
|Photographs of damage to trees or property occurring as a result of severe storms and other forms of severe weather.
|Photographs of floods that have inundated property, roads, bridges and so on. Floods can be flash floods or longer term major flooding.
|Various cloud types photographed from a plane.
|Fog, Mist and Frost
|Fog is basically cloud forming at ground level varying in formation and thickness. Mist tends to occur as result of rain causing saturation mostly in forested areas.
|Photographs of tornadoes, dust devils, waterspouts or landspouts.
|Balls of ice ranging in size from tiny peas to larger than orange size
|'Ring' or arcs that occur as a result of sunlight or moonlight shining through high cloud or ice crystals resemble faint rainbows in the sky.
|Various forms of lightning occurring day or night.
|Cloud formation exhibiting a bumpy appearance. These are common under the anvils of severe thunderstorm but can also be observed under altostratus.
|Same as downburst but affecting a smaller area. A strong straight line wind in thunderstorms usually associated with a rain shaft. Caused by the sudden collapse of an updraft or occurring in the downdraft region.
|Photographs of various forms of precipitation (most) falling through the base of clouds observed at a distance.
|Various types of precipitation falling within proximity of where the photograph was taken.
|Cumulus and cumulonimbus clouds that develop from a fire. The fire provides the lift and water vapour which may condense into clouds of varying sizes.
|Spectacular arcs of colours bands which occur as a result of scattering of sunlight rays.
|Base feature where updraughts and downdraughts move side by side cause a rolling cloud formation.
|Similar in development to a roll cloud but with a more shelf like appearance.
|White ice crystal form of precipitation that can accumulate on the ground occuring during cold conditions.
|Photography of clouds associated with the spectacular sunrise colours.
|Photography of clouds associated with the spectacular sunset colours.
|Precipiation in the form of snow crystal streaks falling towards the ground but mostly evaporating.
|Wall clouds are an isolated lowering of a cloud that is attached to the rain-free base of a thunderstorm, generally to the rear of the visible precipitation area. Wall clouds indicate the updraft of or the inflow to a thunderstorm.
|Inflow bands consist of low clouds, arranged parallel to the low-level winds and moving into or toward a thunderstorm.
|Pileus / Cap Cloud
|Smooth elongated cap like cloud which may form at the top of vigorous thunderstorm or cumulus updrafts.
|The flat, spreading top of a cumulonimbus often shaped like an anvil. Thunderstorm anvils may spread hundreds of kilometres downwind from the thunderstorm itself, and sometimes may spread upwind - known as back sheared anvil.
|A small-scale current of rising air condensing to become an individual tower of a thunderstorm.
|A dome-like protrusion above a thunderstorm anvil, representing a very strong updraft. A persistent anvil dome is often present on a supercell.
|Photographs showing the effects of strong winds and gales on trees and the ocean. Microbursts, thunderstorms, tropical cyclones or other types of low pressure storms may be the cause.
Updated: 1st February 2008
|[Australian Severe Weather index] [Copyright Notice] [Email Contacts] [Search This Site]