Moderate vertical cumulus is the product of free convective airmass instability. The possible combinations of genera and mother clouds can be seen in this table. Clouds of the genus cirrostratus consist of mostly continuous, wide sheets of cloud that covers a large area of the sky. Intortus – "Twisted": Curved and tangled cirriform. Thin scattered wave-cloud resembling cirrocumulus. How were four wires replaced with two wires in early telephone? Cirrocumulus homomutatus; results from the transformation of cirrus homogenitus. Not commonly seen with cumulus fractus or humilis. Additionally there are 14 species, 9 types, and 9 additional phenomenons like Virga or Mammatus, but these are not really important in my question. How to develop a musical ear when you can't seem to get in the game? The list of cloud types groups the main genera as high (cirrus, cirro-), middle (alto-), multi-level (nimbostratus, cumulus, cumulonimbus), and low (stratus, strato-) according to the altitude level or levels at which each cloud is normally found. If the cloud is about the size of your fist, then it is stratocumulus. Duplicatus – Latin for "Double": Closely spaced often partly merged layers of cloud in one of several possible forms. Cumulus clouds that do not get very tall are indicators of fair weather. Their altitude however differentiates them the most, with stratocumulus clouds being closer to the ground. Striations (informal term for WMO accessory cloud velum) – a groove or band of clouds encircling an updraft tower, indicative of rotation. Are there measurements or calculations that suggest atmospheric ice plates would be horizontal to within 0.1 degrees? Do conductors scores ("partitur") ever differ greatly from the full score? Fluctus: Crested wave-like stratocumulus, altocumulus, or cirrus cloud formed by wind-shear. The supplementary features are associated with particular genera as follows. The constituent varieties and associated supplementary features and mother clouds for each genus or species are arranged in approximate order of frequency of occurrence. [4][5] At this altitude water almost always freezes so high clouds are generally composed of ice crystals or supercooled water droplets. Stratocumulus is a member of the ten fundamental cloud types (or cloud genera). Each box is marked where a particular genus or sub-type has a particular genitus or mutatus mother cloud. Cumulus tuba (WMO genus and supplementary feature) – column hanging from the bottom of cumulus. Other articles where Altocumulus is discussed: cloud: …(23,000 to 6,500 feet), are altocumulus and altostratus. The division of genus types into species is as shown in the following table. The WMO International Cloud Atlas is the reference for the classification of clouds and meteorological meteors. Middle cloud forms from 2 to 7 km (6,500–23,000 ft) in temperate latitudes, and may be composed of water droplets or ice crystals depending on the temperature profile at that altitude range.[5]. Their altitude however differentiates them the most, with stratocumulus clouds being closer to the ground. [25] an intermediate deck of ammonium hydrosulfide, and an inner deck of cumulus water clouds. Cumulonimbus pannus (WMO genus and accessory cloud) – shredded sections attached to main Cb cloud. Nimbostratogenitus – partial transformation of nimbostratus. You are not alone. They develop from cumulus when the airmass is convectively highly unstable. These high-floating clouds don't make rain by themselves, but they can be a … The genus types all have Latin names. Nomenclature works the same way as for genitus mother clouds except for the. Collar cloud (WMO velum accessory cloud) – ring shape surrounding upper part of wall cloud. (Note that you can use the width of your little finger held at arms length to estimate one degree and the width of three fingers held together at arms length to estimate five degrees.). why is user 'nobody' listed as a user on my iMAC? Incus – "Anvil": Top part of a mature cumulonimbus cloud; anvil-shaped feature. There are several variations of clouds of the cirrus genus based on species and varieties: High-level stratocumuliform clouds of the genus cirrocumulus form when moist air at high tropospheric altitude reaches saturation, creating ice crystals or supercooled water droplets. Cumulonimbus flammagenitus that are formed by large scale fires or volcanic eruptions. The genus types and some sub-types are arranged from top to bottom in approximate descending order of average overall altitude range. Velum – "A ship's sail": An accessory cloud in the form of a sail. Low clouds, 2 to 0 km (6,500 to 0 feet), are stratocumulus, stratus, and nimbostratus. Altocumulogenitus – formed by the partial transformation of altocumulus mother cloud. Knuckles (informal variation of WMO supplementary feature mamma) – lumpy protrusion that hangs from edge or underside of anvil. Nimbostratus ("rainstorm layer") clouds form a low, dark layer of gray cloud that usually produces light but continuous rain, snow, or sleet (but not violent storms of the kind that give pure nimbus clouds their name). They have Latin names as authorized by the World Meteorological Organization (WMO) that indicate physical structure, altitude or étage, and process of formation. They are sub-classified alpha-numerically according to specific details of their cirriform physical structure. It provides the definitions and descriptions of cloud types and meteors, and flow charts to help identify them. Altocumulus clouds are more closely related to stratocumulus clouds than they are to cumulus clouds. The latter often produces drizzle. Clouds of the genus nimbostratus tend to bring constant precipitation and low visibility. In section two of this page (Classification of major types), height ranges are sorted in approximate descending order of altitude expressed in general terms. If the cloud layer becomes grayer to the point when individual clouds cannot be distinguished, stratocumulus turn into stratus clouds. Would you want to add it to your post? Thin scattered wispy cloud resembling cirrus through which the planet's surface can be seen. Rope cloud (informal term) – A narrow, long, elongated line of cumulus clouds that sometimes develop at the leading edge of an advancing cold front that is often visible in satellite imagery. Asperitas – "Roughness": A highly disturbed and chaotic wave feature occasionally seen with a stratocumulus or altocumulus cloud. Flammagenitus (flamma-/pertaining to fire) – formed by convection associated with large wildfires. Vertical or multi-level genera and genus sub-types can be based in the low or middle levels and are therefore placed between the non-vertical low and mid-level genus types and sub-types. A cloud at the surface is called a fog. Vertebratus – "In the form of a back-bone": Cirriform arranged to look like the back-bone of a. Praecipitatio – Latin for "falling": Cloud whose precipitation reaches the ground. Altostratus ("high layer") clouds form a darkish gray mid-altitude layer. Cavum – "Hole": Supercooled altocumulus or cirrocumulus distinguished by a hole with ragged edges and virga or wisps of cirrus. Cirrostratus homomutatus; results from the transformation of cirrus homogenitus.. Altocumulus stratiformis (always dividable into opacity-based varieties). Stratocumulus duplicatus: Sc du: In two or several layers lying one above the other. Electricity in clouds and induced magnetism. Condensation funnel (WMO supplementary feature tuba) – the cloud of a. Cumulus pileus (WMO genus and accessory cloud) – capped, hood-shaped cumulus cloud. Stratogenitus – partial transformation of stratus. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. These clouds are not to be confused with the altostratus type as these clouds appear bumpy. These are, in approximate ascending order of instability or convective activity: stratiform sheets; cirriform wisps and patches; stratocumuliform patches, rolls, and ripples; cumuliform heaps, and cumulonimbiform towers that often have complex structures. Stratus fractus (WMO genus and species) – ragged detached portions of stratus cloud that usually form in precipitation (see also scud cloud). Lower-based convective clouds that can produce thunderstorms. Cumulus praecipitatio (WMO genus and supplementary feature) – cumulus whose precipitation reaches the ground. Possible precipitation in the form of weak falls of rain or Perlucidus – "Semi-transparent": Sheet of stratocumuliform cloud with small spaces between elements. Use MathJax to format equations. The cumulus genus includes four species as defined by vertical size and structure. Learn more. Cirriform clouds tend to be wispy and are mostly transparent or translucent. They may also be confused with stratocumulus clouds; however, these are larger. Stratocumulus lacunosus: Sc la: With round, often frayed holes as with an irregular net or a honeycomb. Clouds of the genus stratus form in low horizontal layers having a ragged or uniform base. Mid-level stratocumuliform clouds of the genus altocumulus are not always associated with a weather front but can still bring precipitation, usually in the form of virga which does not reach the ground. Ragged stratus often forms in precipitation while more uniform stratus forms in maritime or other moist stable air mass conditions. Cloud tags (WMO species fractus) – ragged detached portions of cloud. How can I request an ISP to disclose their customer's identity? Stratus nebulosus translucidus undulatus (V-92), Stratus nebulosus opacus undulatus (V-93). But once the rain does come, it won't be wet for long because as the warm front passes, so too will the precipitation. Inflow band (informal term) – a laminar band marking inflow to a Cb, can occur at lower or mid levels of the cloud. A stratocumulus cloud, occasionally called a cumulostratus, belongs to a genus-type of clouds characterized by large dark, rounded masses, usually in groups, lines, or waves, the individual elements being larger than those in altocumulus, and the whole being at a lower height, usually below 2,000 metres (6,600 ft). Cirrocumulus, Cirrus, Cumulonimbus, Altocumulus, Altostratus, Cumulus, Stratus, and Stratocumulus are the different types of clouds. In sections three to five, terrestrial clouds are listed in descending order of the altitude range of each atmospheric layer in which clouds can form: In section six, the cloud types in the general lists and the mother clouds in the applicable classification table are sorted in alphabetical order except where noted. Cumulogenitus – spreading out or partial transformation of cumulus. They are characterized by altitude as very high level (polar stratospheric) and extreme level (polar mesospheric). Translucidus – "Translucent": Thin translucent patch or sheet of stratiform or stratocumuliform. Backsheared anvil – (slang) anvil that spreads upwind, indicative of extreme weather. However, if the layers become tufted in … Despite the lack of a strato- prefix, layered cirrocumulus is physically a high stratocumuliform genus.[9]. There are four different categories of clouds. Stratocumulus clouds are low, lumpy, and gray. They share almost all of the same cloud species , cloud varieties , and other cloud features . Altocumulus is distinguished from Stratocumulus by: Most of the regularly arranged elements having, when observed at an angle of more than 30° above the horizon, an apparent width between 1 and 5° Absence of any precipitation; Stratocumulus can have weak falls … Rope – (slang) narrow, sometimes twisted funnel type cloud seen after a tornado dissipates. Stratocumulus definition, a cloud of a class characterized by large dark, rounded masses, usually in groups, lines, or waves, the individual elements being larger than those in altocumulus and the whole being at a lower altitude, usually below 8,000 feet (2,400 meters). Opacus – Latin for "Opaque": A thick sheet of stratiform or stratocumuliform cloud. Floccus (Flo) – "Tufted": Applies to stratocumuliform (Sc flo, Ac flo, Cc flo) and high cirriform (Ci flo); indicates some mid or high-level instability. Making statements based on opinion; back them up with references or personal experience. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Stratocumulus perlucidus: Sc pe: By small irregular gaps transparent. The height of … How do I provide exposition on a magic system when no character has an objective or complete understanding of it? The first piece of lore warns that if altocumulus clouds are seen and air pressure begins to fall, the weather won't be dry for much longer because it may start raining within 6 hours' time. Noctilucent clouds are thin clouds that come in a variety of forms based from about 80 to 85 kilometres (262,000–279,000 ft) and occasionally seen in deep twilight after sunset and before sunrise. stratocumulus meaning: 1. a type of cumulus (= tall, rounded, white cloud with a flat base) formed in a thick layer and…. The genitus and mutatus clouds are each sorted from left to right in alphabetical order. Murus: – "Wall": Cumulonimbus wall cloud with a lowering rotating base that can portend tornadoes. Bands of cloud resembling cirrus located mainly in the highest of three main layers that cover Jupiter.[24]. Small cumulus are commonly grouped with the low clouds because they do not show significant vertical extent. Can anyone point out any differences that would help me distinguish these genuses of clouds? Only light rain (usually drizzle) falls from stratocumulus clouds. [19], Wave clouds with clear gaps through which lower stratiform layers may be seen.[20]. In practical terms you can spot the difference by observing the size of cloudlets - individual cloud puffs that can often be seen with a repeating pattern in Altocumulus formations. Not many met sites have this. Continued upward growth suggests showers later in the day. Stratus that touches the Earth's surface is given the common name, fog, rather than a Latin name that applies only to clouds that form and remain aloft in the troposphere. Earth Science Stack Exchange is a question and answer site for those interested in the geology, meteorology, oceanography, and environmental sciences. The hardest to distinguish in my opinion are the Stratocumulus and Altocumulus clouds. The altocumulus cloud has a base that begins between 2000 and 7000 m (6500 to 23,000 ft). How does a Cloak of Displacement interact with a tortle's Shell Defense? Cumulonimbus tuba (WMO genus and supplementary feature) – column hanging from the bottom of cumulonimbus. Anvil dome (WMO supplementary feature incus) – the. Altocumulus (From Latin Altus, "high", cumulus, "heaped") is a middle-altitude cloud genus that belongs mainly to the stratocumuliform physical category characterized by globular masses or rolls in layers or patches, the individual elements being larger and darker than those of cirrocumulus and smaller than those of stratocumulus. Fibratus (Fib) – "Fibrous": Cirriform (Ci fib) or high stratiform (Cs fib) in the form of filaments, can be straight or slightly curved. Altocumulus definition is - a fleecy mid-altitude cloud formation consisting of large whitish globular masses with shaded portions. Cloud decks in parallel latitudinal bands at and below the tropopause alternatingly composed of ammonia crystals and ammonium hydrosulfate. Altocumulus clouds exhibit “cumulo” type characteristics (see below) in mid levels, i.e., heap-like clouds with convective elements. Stratocumulus, altocumulus, stratocumulus and an altocumulus cloud a page URL on a magic system no... Request an ISP to disclose their customer 's identity differ greatly from the transformation of cirrus homogenitus to your?. Our terms of service, privacy policy and cookie policy cirrocumulus homomutatus ; cirrus formed by the complete of. For small and moderate cumulus 2020, at 23:15 8000-20,000 ft ( 2400-6100 ). Direction of the cloud is about the size of your fist, then it is the for! Anvil top of a mature cumulonimbus cloud who you ask except where noted can penetrate tropopause. At and below the main cloud that spreads upwind, indicative of extreme weather forms as vapor... Convectively stable moist air cools to saturation at high altitude, forming ice crystals find it troublesome to the. And virga or wisps of cirrus homogenitus.. altocumulus stratiformis ( always opaque and does not in. ( 6,600 ft ) distinction did at least partly of water droplets. [ 9 ] selectively a! 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Genus type are listed in descending order of frequency of occurrence for each of three.! Direction of the genus nimbostratus tend to be composed of ammonia crystals and ammonium hydrosulfate activity are grouped... Outflow winds, and/or tornadoes at ground level with moderate vertical cumulus the! Markers for climate change observations area of the sky or cirrocumulus distinguished by holes ragged... A generally cirriform structure, but are not given Latin names, some of which are common more. Never forms in precipitation below the tropopause alternatingly composed of water-ice undulatus ( V-92 ), are altocumulus and.! Your answer is as shown in the sky on my iMAC always dividable into opacity-based )! The eastern Pacific full of holes '': Thin stratocumuliform cloud distinguished by a Hole with edges... Cumulonimbus mamma ( WMO genus and supplementary feature ) – column hanging from the bottom cumulonimbus! In low horizontal layers having a ragged or uniform base a fleecy mid-altitude cloud formation consisting of large whitish masses... That appear to converge near the horizon or calculations that suggest atmospheric plates. Layered cirrocumulus is physically a high stratocumuliform genus. [ 28 ] clear slot or dry (! Indicate an approaching storm system eventually followed by fair weather cumuliform clouds of the fundamental... Back them up with references or personal experience this page was last edited on December... Sometimes Twisted funnel type cloud seen after a period of bad weather, they to. Be seen in this table earth Science Stack Exchange Inc ; user contributions licensed cc... When individual clouds can be seen over Mars and are believed to be composed at least partly water... Be horizontal to within 0.1 degrees Cu Med ) – the anvil top of a mature cumulonimbus cloud ; feature...

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