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Accessory Clouds
   are   
Accompanying a Main Cloud Mass
Altocumulus
   are   
Mid Altitude, Rolls or Rounded Masses in Bands or Patches
Typically a portion of an altocumulus cloud is shaded, distinguishing them from high-level cirrocumulus. The presence of altocumulus clouds on a warm and humid summer morning is commonly followed by thunderstorms later in the day.
Altostratus
   are   
Mid Altitude & Sheet-like
Generally uniform gray sheet or layer, lighter in color than nimbostratus and darker than cirrostratus. The sun can be seen shining through them, and they frequently cover the whole sky. They are similar to lower altitude stratus clouds.
Anvil Domes
   are   
The Dome-like Protrusions on Top of a Cumulonimbus Cloud
An overshooting top or dome is a protrusion of the updraft extending above the anvil level. Generally the larger and the higher one is the more intense the updraft producing it is.
Anvil
   are   
The Top Flatter Part of a Cumulonimbus Cloud
They get their anvil shape from the fact that the rising air in thunderstorms expands and spreads out as the air bumps up against the bottom of the stratosphere.
Arcus
   are   
Arched or Roll Shaped, Low, Horizontal Formations
Attached to cumulus, thick with ragged edges. Shelf and roll clouds are arcus clouds.
Castellanus
   are   
Castle-like With a Series of Turret Shapes
A cloud species of which at least a fraction of its upper part presents some vertically developed cumuliform protuberances (some of which are taller than they are wide) that give the cloud a crenellated or turreted appearance. Castellanus is an indication of instability at middle height (3 - 5 km) and is usually a sign of imminent thunderstorms or an active cold front.
Cirrocumulus
   are   
High Altitude, Small, Rounded Clouds in Rows or Ripples. A Mackerel Sky
Cirrostratus
   are   
High Altitude, Whispy, Sheet-like
Can produce halo effect
Cirrus
   are   
High Altitude, Thin, Whispy Strands
Sometimes referred to as "lock of hair" clouds. They are composed primarily of ice crystals, reflecting the extreme cold at this height. often accompanied by tufts, leading to their common name of 'mare's tail'.
Clear Slots
   are   
Local Regions of Clearing Skies or Reduced Cloud Cover
Iindicating an intrusion of drier air; often seen as a bright area with higher cloud bases on the west or southwest side of a wall cloud. As a rear flank downdraft descends and dries out cloud and occludes around a mesocyclone.
Cloud Tags
   are   
Small, Ragged Cloud Fragments
Collar Clouds
   are   
Rare Ring-shaped Clouds
A ring of cloud seen occasionally at the top of a wall cloud (usually in wall clouds that are rotating) where the wall cloud is attached to the updraft base above it.
Condensation Funnels
   are   
Funnel-shaped Clouds Associated With Rotation
Consisting of condensed water droplets
Congestus
   are   
Cumulus Clouds That Are Taller Than They Are Wide
Cumulus is Latin for pile. A strongly sprouting cumulus species with generally sharp outlines and, sometimes, with a great vertical development; it is characterized by its cauliflower or tower aspect, of large size.
Cumulonimbus
   are   
Exceptionally Dense and Vertically Developed Clouds
They can exist as individual towers or form a line of towers called a squall line. Fueled by vigorous convective updrafts (sometimes in excess 50 knots), the tops of cumulonimbus clouds can easily reach 39,000 feet (12,000 meters) or higher. Associated with powerful thunderstorms known as supercells.
Cumulus
   are   
Flat Based, Puffy, Fair Weather Clouds
Usually low altitude. "Cottonwool" clouds.
Debris Clouds
   are   
Rotating ‘clouds’ of Debris Found at Base of Tornado
Near or on the ground, often appearing beneath a condensation funnel and surrounding the base of a tornado.
Duplicatus
   are   
Superimposed Layers, Sheets, or Patches
Fibratus
   are   
Fine Hairlike or Striated, Filament-like Clouds
The extremities of these filaments are always thin and never terminated by tufts or hooks. This species is found mainly in the genera cirrus and cirrostratus. Cirrostratus fibratus may develop from cirrus fibratus or cirrus spissatus.
Floccus
   are   
Like a Tuft of Wool
Each cloud element is a small tuft with a cumuliform or rounded appearance, the lower part of which is more or less ragged and often accompanied by virga.
Fractus
   are   
Small, Ragged Cloud Fragments
. Fractus have irregular patterns, appearing much like torn pieces of cotton candy, change constantly, often forming and dissipating rapidly. They do not have defined base. Common kinds are scud and "cloud tags"
Funnel Cloud
   are   
Rotating Funnel-shaped Condensation Clouds, Hanging from Cumulonimbus
If the rotation is violent and in contact with the ground, the vortex is a tornado. Funnel clouds can occur through a variety of processes in association with convection. For example, small funnel clouds are infrequently seen extending from small, dissipating cumulus clouds in environments with significant vertical wind shear in the cloud-bearing layer.
Genitus
   are   
Formed from a Part of Another Cloud
It is then given the name of the appropriate genus, followed by the name of the genus of the mother-cloud with the addition of the suffix “genitus” (e.g., stratocumulus cumulogenitus).
Hail Fog
   are   
Shallow Surface Layers of Fog Formed in the Vicinity of Significant Hail Accumulations
Due to decreased temperature and increased moisture leading to saturation in a very shallow layer near the surface. It most often occurs when there is a warm, humid layer atop the hail and when wind is light.
Hot Towers
   are   
Tropical Cumulonimbus Clouds That Penetrates the Tropopause
Humilis
   are   
Cumulus That Are Wider Than Tall
Latin for humble. With uniform height
Incus
   are   
Flat Anvil-like Tops on a Cumulonimbus Cloud
Latin for anvil. Also called anvil, anvil cloud, thunderhead. A supplementary cloud feature peculiar to cumulonimbus capillatus; the spreading of the upper portion of cumulonimbus when this part takes the form of an anvil with a fibrous or smooth aspect.
Inflow Bands
   are   
Bands of Low Clouds, Parallel to Low-level Winds, Moving Toward Cumulonimbus
Can occur at lower or mid levels of a tower. They may indicate the strength of the inflow of moist air into the storm, and, hence, its potential severity.
Knuckles
   are   
Lumpy Protrusions That Hang from an Anvil
They usually appear on the upwind side of a back-sheared anvil, and indicate rapid expansion of the anvil due to the presence of a very strong updraft.
Lacunosus
   are   
Clouds With Rounded Holes Like a Honeycomb or Net
Characterized more by the appearance of the spaces between the cloud elements than by the elements themselves.
Lenticular
   are   
Lens-shaped
Formed by standing waves of wind passing mountains or hills. Can look like giant flying saucers or lopsided stacks of pancakes.
Mammatus
   are   
Bubble- Like Protusions on the Underside of a Cloud
Breast-like
Mediocris
   are   
Cumulus That Are As Tall As They Are Wide
Unique to the genus cumulus, of moderate vertical development, the upper protuberances or sproutings of which are not very marked; it may have a small cauliflower aspect. This cloud does not give any precipitation, but frequently develops into cumulus congestus and cumulonimbus.
Nebulosus
   are   
Nebulous Veils, With No Variation in Colour
This species is found principally in the genera cirrostratus and stratus. Stratus nebulosus is the most common species of stratus. Cirrostratus nebulosus produces halo phenomena.
Nimbostratus
   are   
Rain Clouds of the Layer Type
See a nimbostratus and you'll be getting wet for a long time
Opacus
   are   
Thick Enough to Block out the Sun
This variety is found in the genera altocumulus, altostratus, stratocumulus, and stratus.
Orographic
   are   
Formed by Air Rising at Windward Slopes of Hills and Mountains
Pannus
   are   
Shreds Below the Main Cloud
These shreds may constitute a layer, which may be separated from the main part of the cloud, or attached to it. This accessory cloud occurs mostly with nimbostratus, cumulus, and cumulonimbus.
Perlucidus
   are   
Gaps in the Clouds
A cloud variety, usually of the species stratiformis, in which distinct spaces between its elements permit the sun, moon, blue sky, or higher clouds to be seen. These openings may be very small. This variety is found only in the genera altocumulus and stratocumulus.
Pileus
   are   
Small Cap-like Clouds over Parent Cumulonimbus Cloud
Also called cap cloud, scarf cloud. An accessory cloud of small horizontal extent, often cirriform, in the form of a cap, hood, or scarf, which occurs above or attached to the top of a cumulus or cumulonimbus (less often stratocumulus) cloud that often pierces it. Sometimes several pileus clouds are observed above each other. Pileus is formed as a moist layer locally lifted due to rising cloud below.
Punch Hole Clouds
   are   
The Layer of Cirrocumulus That Develops a Perfect Circular Hole
Radiatus
   are   
Formed in Parallel Rows
Owing to the effect of perspective, these bands seem to converge toward a point on the horizon. This variety occurs in the genera cirrus, altocumulus, altostratus, and stratocumulus, and may modify many of the species, but principally stratiformis.
Roll Clouds
   are   
Elongated, Low-level, Tube Shaped, Horizontal Clouds
Associated with a thunderstorm gust front (or sometimes with a cold front). Roll clouds are relatively rare; they are completely detached from the thunderstorm base or other cloud features, thus differentiating them from the more familiar shelf clouds.
Rope Clouds
   are   
Very Narrow, Long, Rope-like Cumulus Cloud Formation
Frequently visible in satellite imagery along a front or other boundary.
Scud Clouds
   are   
Ragged Detached Portions of Cloud
Shelf Clouds
   are   
Wedge-shaped Arcus Clouds Attached to Base of Parent Cloud
Often attached to the underside of Cb. Associated with a thunderstorm gust front.
Spissatus
   are   
Dense, Greyish Cirrus Clouds
Unique to the genus cirrus, of such optical thickness as to appear greyish on the side away from the sun, and to veil the sun, conceal its outline, or even hide it.
Stratiformis
   are   
Layers With a Large Horizontal Extent
Stratocumulus
   are   
Large Sheets of Clouds With Puffy Bits
A bit like a plate full of dumplings
Stratus
   are   
Flat, Featureless Low Altitude Clouds from Dark Gray to Nearly White
Striations
   are   
Narrow, Straight, or Curved Streaks in Clouds
A low sun angle creates the striation effect by differential shadowing of varying cloud levels.
Tail Clouds
   are   
Horizontal, Tail-shaped Clouds
Usually is observed extending from the wall cloud toward the north or northeast. Cloud tags extending from a wall cloud towards a precipitation core. An area of condensation consisting of laminar ban.
Translucidus
   are   
Transparent Clouds
Sufficiently translucent to reveal the position of the sun, or through which higher clouds may be discerned.
Tunnels
   are   
Columns Pendant from a Cloud Base
Previously called a tuba. Aka. pendant cloud, tornado cloud. This supplementary feature occurs mostly with cumulus and cumulonimbus; when it reaches the earth's surface it constitutes the cloudy manifestation of an intense vortex, namely, a tornado or waterspout.
Uncinus
   are   
Curled, Comma-shaped Clouds
Often in the form of a comma, topped with either a hook or a tuft that is not rounded. The species uncinus is unique to the genus cirrus. The hook takes the shape of a reverse question mark under positive wind shear (wind increasing with height) conditions and the shape of a question mark under negative wind shear.
Undulatus
   are   
Wave-like or Arranged in Ranks and Files
Also called billow clouds, windrow clouds, wave clouds.
Velum
   are   
Thin, Wide Veils of Cloud over or Penetrated by Cumuliform
An accessory cloud
Verterbratus
   are   
Like a Fish Skeleton or Ribs


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guinness john







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