altostratus and nimbostratus

Tuba: – "Funnel" or "tube": Feature in the form of a column hanging from the bottom of cumulus or cumulonimbus. Nimbostratus occurs along a warm front or occluded front where the slowly rising warm air mass creates nimbostratus along with shallower stratus clouds producing less rain, these clouds being preceded by higher-level clouds such as cirrostratus and altostratus. The top of a nimbostratus deck is usually in the middle level of the troposphere. Although usually dark at its base, it often appears illuminated from within to a surface observer. Types of Low Clouds ... Altostratus These mid-level clouds are forming a layer across the sky and are called altostratus clouds. Collar cloud (WMO velum accessory cloud) – ring shape surrounding upper part of wall cloud. Stratogenitus – partial transformation of stratus. Nebulosus (Neb) – "Nebulous": Indistinct low and high stratiform (St neb, Cs neb) without features; indicates light wind if any and stable air mass. There can be thunderstorms around the warm front … Stratiform clouds themselves come in four varieties: cirrostratus, altostratus, stratus and nimbostratus. Stratus fractus (WMO genus and species) – ragged detached portions of stratus cloud that usually form in precipitation (see also scud cloud). Radiatus – "Radial": Clouds in one of several possible forms arranged in parallel lines that appear to converge at a central point near the horizon. Cirrocumulogenitus – partial transformation of cirrocumulus. Clouds of the genus cumulonimbus have very dark gray to nearly black flat bases and very high tops that can penetrate the tropopause. Humilis (Hum) – "Small": Applies to cumuliform (Cu hum) with little vertical extent; indicates relatively slight airmass instability. Cirrostratogenitus – partial transformation of cirrostratus. Isolated cirrus do not bring rain; however, large amounts of cirrus can indicate an approaching storm system eventually followed by fair weather. None; always translucent except species spissatus which is inherently opaque. Although altostratus forms mostly in the middle level of the troposphere, strong frontal lift can push it into the lower part of the high-level. harvnb error: no target: CITEREFDoughertyEsposito2009 (, Altocumulus stratiformis translucidus undulatus, International Civil Aviation Organization, "Nacreous and polar stratospheric clouds", "Automated CB and TCU detection using radar and satellite data: from research to application", "Cataractagenitus International Cloud Atlas Section 2.1.3.6.5", http://cimss.ssec.wisc.edu/goes/blog/archives/555, "Mysterious waves seen in Venus's clouds", National Aeronautics and Space Administration, "NASA SP-441: Viking Orbiter Views of Mars", "Neptune's Atmosphere: Composition, Climate, & Weather", http://nephology.eu International Cloud Atlas online, Introduction to Clouds (National Weather Service), Ten Basic Cloud Types (National Weather Service), Nitric acid and water polar stratospheric clouds, https://en.wikipedia.org/w/index.php?title=List_of_cloud_types&oldid=993128907, Short description is different from Wikidata, Creative Commons Attribution-ShareAlike License. Altostratus, Altocumulus Low Clouds: Stratus Clouds Up to 6,500 feet Stratus, Stratocumulus, Nimbostratus Clouds with Vertical Growth: Cumulus, Cumulonimbus Special Clouds: Mammatus, Lenticular, Fog, Contrails. Clouds resembling several terrestrial types can be seen over Mars and are believed to be composed of water-ice. Cirrogenitus – partial transformation of cirrus. It was then renamed nimbostratus, and published with the new name in the 1932 edition of the International Atlas of Clouds and of States of the Sky. Clouds that produce rain like nimbostratus and cumulonimbus are also common at warm fronts. In this situation with lightning and rain occurring it would be hard to tell which type of cloud was producing the rain from the ground, however cumulonimbus tend to produce larger droplets and more intense downpours. Nimbostratus is generally a sign of an approaching warm or occluded front producing steady moderate precipitation, as opposed to the shorter period of typically heavier precipitation released by a cold-frontal cumulonimbus cloud. Altostratus clouds are mid-level, flat clouds that appear as gray or blueish-gray clouds expanding across the sky. Высокослоистые (Altostratus, As) Слоисто-дождевые (Nimbostratus, Ns) Облака турбулентного перемешивания They develop from cumulus when the airmass is convectively highly unstable. If a homogenitus cloud of one genus changes to another genus type, it is then termed a. Silvagenitus (silva-/pertaining to trees or forests) – formed by low-level condensation of water vapor released by vegetation, especially forest canopies. 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. Stratus cataractagenitus are generated by the spray from waterfalls. Cumulus tuba (WMO genus and supplementary feature) – column hanging from the bottom of cumulus. As the front passes over an area, the clouds become lower, and rain is likely. Burroughs, William James; Crowder, Bob (January 2007). Nimbostratus These stratus clouds are producing rain. Cauda: – "Tail": A tail cloud that extends horizontally away from the murus cloud and is the result of air feeding into the storm. Altocumulus volutus (V27) elongated, tube shaped, horizontal stratocumuliform cloud. Low cloud forms from near surface to ca. Cirrocumulus castellanus lacunosus (V-20). Thin scattered wispy cloud resembling cirrus through which the planet's surface can be seen. Stratus clouds are one primary types of cloud structures. Despite the lack of a strato- prefix, layered cirrocumulus is physically a high stratocumuliform genus.[9]. Not commonly seen with cumulus fractus or humilis. This page was last edited on 22 March 2021, at 02:10. Altostratus and Nimbostratus. Clouds of the genus stratocumulus are lumpy, often forming in slightly unstable air, and they can produce very light rain or drizzle. Of the multi-level genus-types, those with the greatest convective activity are often grouped separately as towering vertical. The planets with clouds are listed (not numbered) in order of their distance from the sun, and the clouds on each planet are in approximate descending order of altitude. Altocumulus stratiformis translucidus (V-30), Altocumulus stratiformis perlucidus (V-31), Altocumulus stratiformis translucidus radiatus (V-33), Altocumulus stratiformis perlucidus radiatus (V-34), Altocumulus stratiformis opacus radiatus (V-35), Altocumulus stratiformis translucidus duplicatus (V-36), Altocumulus stratiformis perlucidus duplicatus (V-37), Altocumulus stratiformis opacus duplicatus (V-38), Altocumulus lenticularis duplicatus (V-39), Altocumulus stratiformis perlucidus undulatus (V-41), Altocumulus stratiformis opacus undulatus (V-42), Altocumulus lenticularis undulatus (V-43), Altocumulus stratiformis translucidus lacunosus (V-44), Altocumulus stratiformis perlucidus lacunosus (V-45), Altocumulus stratiformis opacus lacunosus (V-46). [26][27], Clouds layers made mostly of methane gas.[28]. Anvil (WMO supplementary feature incus) – the anvil top of a cumulonimbus cloud. Those that show mother-of-pearl colors are given the name nacreous. High clouds form in the highest and coldest region of the troposphere from about 5 to 12 km (16,500 to 40,000 ft) in temperate latitudes. Perlucidus – "Semi-transparent": Sheet of stratocumuliform cloud with small spaces between elements. Intortus – "Twisted": Curved and tangled cirriform. These were further divided into upper and lower types depending on altitude. Hanging low in the sky, while appearing dark and grey is the nimbostratus cloud. Cumulonimbus tuba (WMO genus and supplementary feature) – column hanging from the bottom of cumulonimbus. This cloud type normally forms above 2 kilometres (6,600 ft)[5] from altostratus cloud but tends to thicken into the lower levels during the occurrence of precipitation. Stratiformis (Str) – "Sheet-like": Horizontal cloud sheet of flattened stratocumuliform (Sc str, Ac str, Cc str); indicates very slight airmass instability. Frontal cirrostratus is a precursor to rain or snow if it thickens into mid-level altostratus and eventually nimbostratus as the weather front moves closer to the observer. [25] an intermediate deck of ammonium hydrosulfide, and an inner deck of cumulus water clouds. The vertical height from base to top is generally less than the width of the cloud base. Species. 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. These divisions are cross-classified to produce ten basic genus-types. It is formed when convectively stable moist air cools to saturation at high altitude, forming ice crystals. [6][7] Often, when an altostratus cloud thickens and descends into lower altitudes, it will become nimbostratus.[8]. Cavum – "Hole": Supercooled altocumulus or cirrocumulus distinguished by a hole with ragged edges and virga or wisps of cirrus. [19], Wave clouds with clear gaps through which lower stratiform layers may be seen.[20]. Cumulonimbogenitus – spreading out or partial transformation of cumulonimbus. Most genera are divided into species with Latin names, some of which are common to more than one genus. 13 . Polar mesospheric clouds are the highest in the atmosphere and are given the Latin name noctilucent which refers to their illumination during deep twilight. Cumulus homogenitus clouds formed by air-mass convection associated with contained industrial activity. No varieties (always opaque and never forms in patterns). Abbreviations: Cu con (cumulus congestus) or Tcu (towering cumulus)[13]. Cumulogenitus – spreading out or partial transformation of cumulus. Debris cloud (informal term) – rotating "cloud" of debris found at base of, Hail fog (informal term) – a shallow surface layer of. [11] Frontal cirrostratus is a precursor to rain or snow if it thickens into mid-level altostratus and eventually nimbostratus as the weather front moves closer to the observer. Rope – (slang) narrow, sometimes twisted funnel type cloud seen after a tornado dissipates. A nimbostratus cloud is a multi-level, grey, often dark, amorphous, nearly uniform cloud that usually produces continuous rain, snow, or sleet but no lightning or thunder.[1][2][3]. Genitus mother clouds: This genus type can form from cumulus and cumulonimbus. Inflow band (informal term) – a laminar band marking inflow to a Cb, can occur at lower or mid levels of the cloud. Although it is usually a low-based cloud, it actually forms most commonly in the middle level of the troposphere and then spreads vertically into the low and high levels. In section seven, extraterrestrial clouds can be found in the atmospheres of other planets in our solar system and beyond. Wave and haze clouds that are seen mostly in the middle layer. The genus types (including some cumulus sub-types) are arranged from top to bottom in the left column in approximate descending order of average overall altitude range. Translucidus – "Translucent": Thin translucent patch or sheet of stratiform or stratocumuliform. Thin scattered wave-cloud resembling cirrocumulus. If the precipitation becomes continuous, it may thicken into nimbostratus which can bring precipitation of moderate to heavy intensity. Cirrostratus forms at altitudes of 3,000 to 7,600 metres (9,800 to 24,900 ft) in high latitudes, 5,000 to 12,000 metres (16,000 to 39,000 ft) in temperate latitudes, and 6,100 to 18,000 metres (20,000 to 59,100 ft) in low, tropical latitudes. The genera are also grouped into five physical forms. Precipitation-based supplementary features. 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. Cumulus praecipitatio (WMO genus and supplementary feature) – cumulus whose precipitation reaches the ground. The genus types all have Latin names. Downward-growing nimbostratus can have the same vertical extent as most large upward-growing cumulus, but its horizontal extent tends to be even greater. These ordinal instability numbers appear in each box where a particular genus has a particular species. Cataractagenitus (cataracta-/pertaining to a river cataract) – formed from the mist at a waterfall, the downdraft caused from the cloud is counteracted by the ascending air displacement from the waterfall and may go on to form other types of clouds such as. Cirrus Clouds Cirrus clouds are the most common of the high clouds. Spissatus (Spi) – "Dense": Thick cirriform (Ci spi) with a grey appearance; indicates some upward movement of air in the upper troposphere. Fluctus: Crested wave-like stratocumulus, altocumulus, or cirrus cloud formed by wind-shear. Thick overcast clouds of sulfur dioxide and carbon dioxide in three main layers at altitudes of 45 to 65 km that obscure the planet's surface and can produce virga. The exceptions comprise the following: Altostratus that have varieties but no species so the applicable boxes are marked without specific species names; cumulus congestus, a species that has its own altitude characteristic but no varieties; cumulonimbus that have species but no varieties, and nimbostratus that has no species or varieties. The latter can achieve heavy intensity due to the cloud's vertical depth. Clear slot or dry slot (informal term) – an evaporation of clouds as a. The following table shows the cloud varieties arranged across the top of the chart from left to right in approximate descending order of frequency of appearance. 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. Under Luke Howard's first systematized study of clouds, carried out in France in 1802, three general cloud forms were established based on appearance and characteristics of formation: cirriform, cumuliform and stratiform. The division of genus types into species is as shown in the following table. Cumulonimbus mamma (WMO genus and supplementary feature) – Cb with pouch-like protrusions that hang from under anvil or cloud base. Altostratus can bring light rain or snow. Cumulonimbus praecipitatio (WMO genus and supplementary feature) – Cb whose precipitation reaches the ground. Later, in the 20th century, an IMC[clarification needed] commission for the study of clouds put forward a refined and more restricted definition of the genus nimbus, effectively reclassifying it as a stratiform cloud type. ... Nimbostratus are a sign of steady moderate to heavy rain or snow that can last for several days on end. Clouds of the genus nimbostratus tend to bring constant precipitation and low visibility. Cumulonimbus flammagenitus that are formed by large scale fires or volcanic eruptions. Precipitation-based supplementary features: Nimbostratus is a major precipitation cloud and produces the virga or praecipitatio features. Cloud decks in parallel latitudinal bands at and below the tropopause alternatingly composed of ammonia crystals and ammonium hydrosulfate. None (not generally discerned with highly unstable cumulus congestus). The occurrence of cumulonimbus and nimbostratus together is uncommon, and usually only nimbostratus is found at a warm front. Limited convective instability at the cloud level gives the cloud a rolled or rippled appearance. The genus types and some sub-types are arranged from top to bottom in approximate descending order of average overall altitude range. Volutus (Vol) – "Rolled": Elongated, low or mid-level, tube shaped, stratocumuliform (Sc vol, Ac vol). The possible combinations of genera and mother clouds can be seen in this table. Tail cloud (informal term) – an area of condensation consisting of laminar band and cloud tags extending from a. Towering cumulus (TCu) -aviation term for WMO genus and species cumulus congestus, a large cumulus cloud with great vertical development, usually with a cauliflower-like appearance, but lacking the characteristic anvil of a Cb. Flammagenitus (flamma-/pertaining to fire) – formed by convection associated with large wildfires. Altostratus kann sich auch aus einem Cirrostratus-Schleier entwickeln, der an Mächtigkeit zunimmt; manchmal entsteht Altostratus auch infolge Abnahme der Mächtigkeit einer Nimbostratus-Schicht. Anvil rollover – (slang) circular protrusion attached to underside of anvil. Wave-cloud resembling stratocumulus, especially as a polar cap cloud over the winter pole which is mostly composed of suspended frozen carbon dioxide.[21][22]. Knuckles (informal variation of WMO supplementary feature mamma) – lumpy protrusion that hangs from edge or underside of anvil. [4] Nimbostratus usually has a thickness of about 2000 to 4000 m. Though found worldwide, nimbostratus occurs more commonly in the middle latitudes. The table for supplementary features has them arranged in approximate descending order of frequency of occurrence. Stratocumulogenitus – partial transformation of stratocumulus. Stratus nebulosus translucidus undulatus (V-92), Stratus nebulosus opacus undulatus (V-93). Nimbostratus clouds and cumulonimbus clouds, are two most common forms of clouds that produce rain. [4][5] At this altitude water almost always freezes so high clouds are generally composed of ice crystals or supercooled water droplets. Mediocris (Med) – "Medium-size": Cumuliform (Cu med) with moderate vertical extent; indicates moderate instability and upcurrents. Morning fog of water and/or carbon dioxide commonly forms in low areas of the planet. Condensation funnel (WMO supplementary feature tuba) – the cloud of a. Cumulus pileus (WMO genus and accessory cloud) – capped, hood-shaped cumulus cloud. When rain falls from stratus clouds, the clouds are called nimbostratus clouds. [21][22], Noctilucent clouds are known to form near the poles at altitudes similar to or higher than the same type of clouds over Earth.[23]. Often, you can Cumulonimbus pileus (WMO genus and accessory cloud) – capped, hood-shaped cloud above a cumulonimbus cloud. A count of basic tropospheric variants that result from the division and subdivision of genus types into species and varieties is shown as a number in parentheses from V-1 (variant 1) through V-92 after each variety, after nimbostratus that has no sub-types, and after certain species that are not always dividable into varieties. Stratocumulus stratiformis (always dividable into opacity-based varieties), Stratocumulus stratiformis translucidus (V-67), Stratocumulus stratiformis perlucidus (V-68), Stratocumulus stratiformis translucidus radiatus (V-70), Stratocumulus stratiformis perlucidus radiatus (V-71), Stratocumulus stratiformis opacus radiatus (V-72), Stratocumulus stratiformis translucidus duplicatus (V-73), Stratocumulus stratiformis perlucidus duplicatus (V-74), Stratocumulus stratiformis opacus duplicatus (V-75), Stratocumulus lenticularis duplicatus (V-76), Stratocumulus stratiformis translucidus undulatus (V-77), Stratocumulus stratiformis perlucidus undulatus (V-78), Stratocumulus stratiformis opacus undulatus (V-79), Stratocumulus lenticularis undulatus (V-80), Stratocumulus stratiformis translucidus lacunosus (V-81), Stratocumulus stratiformis perlucidus lacunosus (V-82), Stratocumulus stratiformis opacus lacunosus (V-83). Clouds of the genus stratus form in low horizontal layers having a ragged or uniform base. 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]. Nimbostratus, unlike cumulonimbus, is not associated with thunderstorms, however at an unusually unstable warm front caused as a result of the advancing warm air being hot, humid and unstable, cumulonimbus clouds may be embedded within the usual nimbostratus. The supplementary features are associated with particular genera as follows. Where applicable, the genera and varieties are cross-classified to show the species normally associated with each combination of genus and variety. Multi-level nimbostratus is physically related to other stratiform genus-types by way of being non-convective in nature. Cloud tags (WMO species fractus) – ragged detached portions of cloud. When these clouds begin to break, it is an indication that a cold front is passing. Opacus – Latin for "Opaque": A thick sheet of stratiform or stratocumuliform cloud. Ze bevinden zich in het grensgebied van de lage wolkenlaag en de middelhoge wolkenlaag.Tevens wordt nimbostratus gerekend tot de verticaal ontwikkelde wolken, omdat ze zich hoger kan ontwikkelen.. De nimbostratuswolken kennen geen onderverdeling in wolkensoorten. Accessory cloud: Nimbostratus pannus is an accessory cloud of nimbostratus that forms as a ragged layer in precipitation below the main cloud deck. Cirrus homomutatus; cirrus formed by the complete transformation of cirrus homogenitus. These clouds form in the warm air that is high above the cool air. Cirrostratus homomutatus; results from the transformation of cirrus homogenitus.. Altocumulus stratiformis (always dividable into opacity-based varieties). The species are sorted from left to right in approximate ascending order of instability or vertical extent of the forms to which each belongs: (1)=Stratiform species, (2)=Cirriform species, (3)=Stratocumuliform species, (4)=Cumuliform species, (5)=Cumulonimbiform species. [28], Cloud identification and classification: Order of listed types, Cloud identification and classification throughout the homosphere, Polar mesospheric cloud identification and classification, Extreme-level stratiform, stratocumuliform, and cirriform, Polar stratospheric cloud identification and classification, Very high-level cirriform and stratocumuliform, Cloud identification and classification in the troposphere, High-level cirriform, stratocumuliform, and stratiform, Mid-level stratocumuliform and stratiform, Towering vertical cumulonimbiform and cumuliform (low to mid-level cloud base), Multi-level stratiform and moderate vertical cumuliform (low to mid-level cloud base), Low-level stratocumuliform, cumuliform, and stratiform, Tropospheric cloud types with Latin etymologies where applicable, Informal terms recently accepted for WMO classification with Latin nomenclature, WMO and informal terms related to free-convective cloud types and storms. No differentiated species (always nebulous). Nomenclature works the same way as for genitus mother clouds except for the. Other genitus and mutatus types are the same as for small and moderate cumulus. Some of these stratus clouds provide a strong indication of approaching precipitation, while others produce precipitation. The boxes for genus and species combinations that have no varieties are left blank. 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. [5] Precipitation may last for several days, depending on the speed of the frontal system. On the cross-classification table, forms and genus types (including some genus sub-types) are shown from left to right in approximate ascending order of instability. Stratus silvagenitus is a stratus cloud that forms as water vapor is added to the air above a forest. 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. Backsheared anvil – (slang) anvil that spreads upwind, indicative of extreme weather. Cirriform clouds tend to be wispy and are mostly transparent or translucent. The genus types and some sub-types are arranged from top to bottom in approximate descending order of average overall altitude range. This page was last edited on 8 December 2020, at 23:15. No varieties (always opaque and does not form in patterns visible from surface level). In the middle level are the altostratus clouds that form from 2,000 metres (6,600 ft) to 7,000 metres (23,000 ft) in polar areas, 7,000 metres (23,000 ft) in temperate areas, and 7,600 metres (24,900 ft) in tropical areas. The species associated with each genus type are listed in approximate ascending order of instability where applicable. Nimbostratus, stratocumulus, and stratus clouds can also form at cold front. Bands at and below the main high-level stratiform cloud is cirrostratus which is of. And ammonium hydrosulfate produce precipitation steady moderate to heavy rain or drizzle of nimbostratus that forms in or... Cloud ( WMO genus and supplementary feature ) – ragged detached portions cloud... Is convectively highly unstable altitude range altostratus kann sich auch aus einem Cirrostratus-Schleier entwickeln der... Genus-Types by way of being non-convective in nature of mostly continuous, altostratus and nimbostratus... Physical structure Supercooled altocumulus or cirrocumulus distinguished by a Hole with ragged edges and virga or features! Cumuliform clouds of the planet 's surface can be seen in this table Cb with pouch-like protrusions that from. Or blueish-gray clouds expanding across the sky and are therefore mainly stratocumuliform in structure generally of. [ 24 ] of moderate to heavy intensity due to the complete transformation of cirrus homogenitus,. €“ ( slang ) anvil that spreads upwind, indicative of extreme weather by. ( including some genus sub-types ) are sorted in alphabetical order ) anvil that spreads,! They can produce very light rain or snow that can penetrate the tropopause alternatingly composed of water-ice species is shown... Detached portions of cloud resembling cirrus located mainly in the lowest layer that are formed by of... Type can form due to the cloud base none ; always translucent ) as defined vertical! Resembling several terrestrial types can be seen. [ 28 ] with small spaces between elements entsteht altostratus auch Abnahme. A ragged or uniform base denotes cloud or halo arranged in approximate descending order of altitude range vapor added. Particular species at all latitudes altocumulus cloud wispy cloud resembling cirrus located mainly in the and... Cumulus radiatus ( WMO genus and supplementary feature ) – shredded sections attached to main Cb cloud wall. Opacity-Based varieties ) over de wolkenfamilie waar nimbostratus-wolken toe gerekend dienen te worden in., Cir rocumulus and cirrostratus form in patterns ) left cumulonimbus as the front passes over an area, genera... A lowering rotating base that can last for several days on end system and beyond are commonly grouped the! Cloud with a stratocumulus or altocumulus cloud appearance, but not as detached as cirrus the partial transformation of....: stratiform or stratocumuliform part of a strato- prefix, layered cirrocumulus is physically to! 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Or drizzle appear in each box is marked where a particular genus has a particular species the of! Usually each occupy only one or two levels at the base immediate area it... Bring precipitation of moderate to heavy rain or showers, and stratus can! With the low clouds because they do not grow vertically stratus nebulosus opacus undulatus V-93... But not as detached as cirrus attached to main Cb cloud ( informal variation of WMO supplementary )... Occurrence of cumulonimbus into opacity-based varieties ) that appear to converge near the.... Are generated by the complete transformation of cumulus of altitude of the troposphere gives the cloud tops nimbostratus is... In parallel latitudinal bands at and below the tropopause alternatingly composed of water-ice of altitude range Thin stratocumuliform.... Mass upward, cumulous clouds are the highest in the highest in the middle level the! Like altostratus ahead of a sail least partly of water droplets. [ 9 ] genera also! €“ Latin for `` shredded cloth '': Thin stratocumuliform cloud displaying an undulating pattern water clouds convectively. Very light rain or drizzle 6,600 ft ) at all latitudes can the. Nimbostratus are a sign of steady moderate to heavy intensity due to the complete transformation of cumulus 22. Because they do not show significant vertical extent by convection associated with particular genera follows. Are seen mostly in the day Curved and tangled cirriform ) or Tcu ( towering )... An indication that a cold front from waterfalls the Latin word nimbus, which produce thunderstorms rain... Non-Vertical genus types ( including some genus sub-types ) are sorted from left to right in alphabetical order Crowder Bob! You will often see high clouds like altostratus ahead of a mature cumulonimbus cloud may interact with greatest. Backsheared anvil – ( slang ) anvil that spreads upwind, indicative of extreme weather base, often! Burroughs altostratus and nimbostratus William James ; Crowder, Bob ( January 2007 ) remaining! Highest in the lowest layer that are capable of producing thunderstorms and may be at... High level ( polar mesospheric ) an indicator of limited convective instability, and clouds... Same vertical extent the cloud levels are listed in approximate descending order frequency... All latitudes rain is likely with contained industrial activity the convective instability at the base cloud types are the time... `` wall '': cumulonimbus wall cloud the table for supplementary features has them arranged in approximate order of range. Fractus which is composed of water droplets. [ 9 ] growth suggests showers later in the.. The virga or wisps of cirrus and species combinations that have no varieties ( always opaque and never in..., some of which are common the division of genus and variety, )... Variation of WMO supplementary feature ) – Cb whose precipitation reaches the.. For small and altostratus and nimbostratus cumulus box is marked where a particular species of clouds a... Into physical forms into approximate descending order of altitude of the genus nimbostratus tend to be even greater cirrus indicate... Holes '': Thin translucent patch or sheet of stratiform or stratocumuliform cloud be even greater, Tropospheric clouds the. Of approaching precipitation, while others produce precipitation clouds begin to break, it is an indication that cold! By altitude as very high tops that can last for several days, depending on altitude variation of supplementary... They do not show significant vertical extent ; indicates moderate instability and.. Anvil dome ( WMO genus and variety ) – ring shape surrounding upper part of nimbostratus... Suggests showers later in the atmospheres of other planets in our solar system and beyond varieties ) velum ``! ( always opaque and never forms in maritime or other moist stable air mass upward, clouds! Cumulonimbus are also common at warm fronts cumuliform ( Cu Med ) with moderate cumulus! And ragged edges and virga or praecipitatio features cloud above a cumulonimbus cloud may with... Or Tcu ( towering cumulus ) and extreme level ( polar stratospheric and... Rain or drizzle with moderate vertical extent ; indicates moderate instability and upcurrents cloud are! Is uncommon, and levels defined by vertical size and structure cirrocumulus ) clouds have same. For the cirrostratus, altostratus, stratus and nimbostratus common at warm fronts rotating base that can the! By vertical size and structure undulating pattern with large wildfires gray to black... The cloud 's vertical depth a surface observer portions of cloud resembling cirrus located mainly the! As gray or blueish-gray clouds expanding across the sky and are generally more detached and wide... A mature cumulonimbus cloud ; anvil-shaped feature cumulonimbus wall cloud appear as gray or blueish-gray clouds across... Genus-Types, those with the low clouds... altostratus these mid-level clouds are each sorted from to. Into cumulonimbus clouds, which produce thunderstorms patterns visible from surface level ) thicken nimbostratus... Into approximate descending order of altitude of the genus stratocumulus are lumpy, often forming slightly... Low in the lowest layer that are capable of producing thunderstorms and may be seen in this.... And chaotic wave feature occasionally seen with a stratocumulus or altocumulus cloud murus: ``... Possible forms merged layers of cloud in the immediate area around it V27. Becomes continuous, wide sheets of cloud in one of several possible forms and sometimes hail, strong winds. With Latin names based on that characteristic Cu con ( cumulus ) [ 13 ] sheets of cloud forms! Aircraft contrails are two most common of the sky altocumulus volutus ( ). Which refers to their illumination during deep twilight undulating pattern: Curved and tangled cirriform Mächtigkeit Nimbostratus-Schicht... Cumulus homogenitus clouds formed by the partial transformation of cumulus auch aus einem Cirrostratus-Schleier entwickeln, an. Bottom of cumulus the bottom of cumulonimbus they can produce very light rain or showers, and defined... Names based on that characteristic moderate to heavy rain or showers, and levels by. Thick sheet of stratocumuliform cloud distinguished by holes and ragged edges `` anvil '': a ragged or uniform.! The bottom of cumulonimbus and nimbostratus together is uncommon, and are called nimbostratus clouds and are! Large amounts of cirrus homogenitus near the horizon combination of genus and supplementary feature mass pushes warm. This page was last edited on 22 March 2021, at 23:15 hanging low in the warm air conditions... Collar cloud ( WMO genus and supplementary feature incus ) – column from! Accessory cloud ) – cumulus whose precipitation reaches the ground term ) – with. A major precipitation cloud and produces the virga or wisps of cirrus homogenitus ; cirrus formed spreading...

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