City Of Williamsburg Property Information,
Air Cooled Motorcycles For Sale,
Castel Felice Passenger List 1969,
Mobile Homes For Rent Near Me Under $500 A Month,
Florida Rules Of Civil Procedure Objections To Discovery,
Articles F
They often produce precipitation . Examples Of Positives And Negatives, Storm Chaser Equipment for Weather Enthusiasts. During formation period, puffy tops of cumulus clouds can protrude from stratocumulus cumulogenitus for a relatively long time until they completely spread in horizontal direction. In a lot of ways, these clouds are like altocumulus clouds, but much closer to the ground. What Causes Weather To Change And How Do Forecasters Predict Weather Patterns? Sometimes they line up in rows and other times they spread out. Cumulonimbus clouds are heavy and dense; they tend to build dramatically upward and are often harbingers of thunderstorms, hail, or tornadoes. Stratocumulus Lenticularis are separate flat elongated seed-shaped clouds. Stratocumulus Floccus - These clouds are small and puffy. Maybe you looked at the shapes they formed or their various colors. Stratocumulus clouds are shallow and thin clouds that cover large parts of the oceans and for this reason they have a significant effect on the radiative balance (Wood, 2012). They are the following: From there, there are also an additional six supplementary features of stratocumulus clouds that include: Altocumulus clouds are the cloud type that most resembles stratocumulus clouds and since they also share similar features, species, and varieties it is quite easy to mix them up. 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). Please be respectful of copyright. A cumulonimbus calvus cloud has a puffy top. The new year once started in Marchhere's why, Jimmy Carter on the greatest challenges of the 21st century, This ancient Greek warship ruled the Mediterranean, How cosmic rays helped find a tunnel in Egypt's Great Pyramid, Who first rode horses? Head over the NASA Space Place website to find out how to make this cloud mobile! Tsunami waves can be more than 33 feet high. Go outside or look out the window toward the sky to begin observations. If you see altocumulus clouds on a warm, humid morning, there might be a thunderstorm by late afternoon. Stratocumulus Stratocumulus (Sc) - the name derives from the latin words stratus = flattened layer or spread out and cumulus = mass or heap. What Are Stovepipe Tornadoes And How Dangerous Are They? Much smaller than raindrops, cloud droplets are extremely light and amass while they float, mixing with air to form the fluffy formations we see suspended in the sky. Nimbostratus are very common clouds . Otherworldly looking lenticular clouds resemble stacks of giant disks rising in the sky. Clouds normally form within the troposphere, or the layer of atmosphere closest to Earth. They are the most common clouds on earth recognised by their well-defined. Stratocumulus Opacus is a dark layer of clouds covering entire sky without any break. [9] Other scientists say that the model used in that study unrealistically extrapolates the behavior of small cloud areas onto all cloud decks, and that it is incapable of simulating anything other than a rapid transition, with some comparing it to "a knob with two settings". stratocumulus and an altocumulus cloud, point
Hardly clear, climate scientists say", Clouds-Online.com Cloud Atlas with many photos and description of the different cloud genus, National Science Digital Library Stratocumulus, Muriel Martin Online Stratocumulus Cloud, WW2010 University of Illinois Stratocumulus Clouds, BBC Weather Centre Types of Cloud Stratocumulus and Altocumulus, Nacreous polar stratospheric clouds (PSC), Cumulus castellanus (unofficial alternative name for Cu con)), https://en.wikipedia.org/w/index.php?title=Stratocumulus_cloud&oldid=1138146699, Short description is different from Wikidata, Articles needing additional references from September 2008, All articles needing additional references, Creative Commons Attribution-ShareAlike License 3.0. Manage Settings Cumulus clouds are a cloud-spotting favorite: They are big, white, and cottony anddepending on your imaginationmay look like a bear, an apple, or any other familiar object. Altocumulus clouds are more closely related to stratocumulus clouds than they are to cumulus clouds. Cirrostratus are transparent high clouds, which cover large areas of the sky. Stratocumulus duplicatus is common on species lenticularis or lenticular cloud. Altocumulus clouds are relatively thin. Both stratocumulus and stratus clouds are found at the same altitude. Cumulus, Stratus, and Cirrus. Stratocumulus clouds are a unique combination of both stratus and cumulus clouds. Most often, stratocumulus produce no precipitation, and when they do, it is generally only light rain or snow. On drier areas they quickly dissipate over land, resembling cumulus humilis. The term mackerel sky is also common to altocumulus (and cirrocumulus) clouds that display a pattern resembling fish scales. Heres why each season begins twice. Some of the clouds you see in the sky could be from airplanes. What The. These types of clouds come in a wide variety of sizes, species, and varieties as well as having many different features. Our editors will review what youve submitted and determine whether to revise the article. Updates? Stratocumulus Lenticularis are separate flat elongated seed-shaped clouds. When deciding between stratocumulus and nimbostratus clouds, remember that nimbostratus clouds are associated with rain, whereas stratocumulus clouds only rain on the rarest of occasions. These clouds can look like cells under a microscope - sometimes they line up in rows and other times they spread out. These are some of the most common ones found in the sky, and they are easy to identify because they're big, white, and puffy. High clouds are classified as either cirrus, cirrostratus, or cirrocumulus. Cumulonimbus clouds are the largest type of cloud, and it can extend through all three regions of clouds. Learn more about clouds and how they form on NASA Climate Kids, use this dichotomous key to identify types of clouds. If
Eco-friendly burial alternatives, explained. A simple test to distinguish these is to compare the size of individual masses or rolls: when pointing one's hand in the direction of the cloud, if the cloud is about the size of the thumb, it is altocumulus; if it is the size of one's fist, it is stratocumulus. You might already know what stratus clouds are: the flat, gray clouds that sit low in the sky. On the contrary, stratocumulus clouds can contain plenty of features. If Sc lacunosusdisplay a mosaic pattern they may only indicate a transitional weather improvement. cloud types (or cloud genera). Cirrus clouds are made of ice crystals and appear thin, white, and wispy. (Definitive Guide), What Happens When Youre Picked Up By A Tornado? [6] It was suggested that this finding could help explain past episodes of unusually rapid warming such as Paleocene-Eocene Thermal Maximum[7] In 2020, further work from the same authors revealed that in their large eddy simulation, this tipping point cannot be stopped with solar geoengineering: in a hypothetical scenario where very high CO2 emissions continue for a long time but are offset with extensive solar geoengineering, the break-up of stratocumulus clouds is simply delayed until CO2 concentrations hit 1,700 ppm, at which point it would still cause around 5C (9.0F) of unavoidable warming. Stratocumulus is a member of the ten fundamental The main difference between the two comes from the altitude of the clouds. However, even the clouds can fall if there is no hot air rising up in the atmosphere which can even lead to many miss happenings. The Learn more about clouds and how they form on NASA Climate Kids. When Nature Strikes: Wildfires - Why are they a challenge to stop? These clouds look quite puffy and are usually found converged together similar to altocumulus clouds. What is a Hurricane Local Statement, and What Does it Mean? These clouds are low, lumpy, and gray. Then, make your own cloud observations and record what you see. Stratus clouds appear as a thin gray layer in the sky. Stratocumulus Perlucidus is a layer of stratocumulus clouds with small spaces, appearing in irregular pattern, through which clear sky or higher clouds can be seen. convection affects a shallow zone because dry, stable air above the cloud sheet prevents further upward development. Support your business with world-leading science and technology. Other articles where stratocumulus is discussed: atmosphere: Cloud formation within the troposphere: are randomly distributed and as stratocumulus when they are organized into lines. views 2,382,540 updated May 14 2018. stratocumulus From the Latin stratus, meaning 'flattened' or 'spread out' and cumulus, meaning 'heap', the name of a cloud composed of sheets or layers of grey to whitish appearance, typically with dark patches which are not fibrous. Like all other types of clouds, stratocumulus clouds are condensed water droplets. If you need help, ask an adult to join you in your observations. your hand toward the cloud. They're found in the middle layer of the troposphere, lower than cirrocumulus and higher than their cumulus and stratocumulus counterparts. In this lesson, learn about what stratocumulus clouds are, including what they look like, how they form, and the type of weather they bring. Have you ever looked up at the clouds and wondered what gives them different shapes, sizes and colors? There are many different kinds of clouds, and in this lesson, we will focus on a type called stratocumulus. More dramatic versions of stratocumulus clouds include (but arent limited to) chaotic and wavy features (asperitas), sac-like features (mamma), and can even have the rare kelvin-helmholtz wave cloud (fluctus) association. Sometimes they are so thin that the halo is the only indication that a cirrostratus cloud is in the sky. the cloud is about the size of your fist, then it is stratocumulus. Stratus clouds may produce a light drizzle or a small amount of snow. Precipitation can obscure the base of the clouds. These clouds do not share similar varieties or species either. Stratocumulus. Some call these clouds "high fog" for their fog-like form. Do you remember seeing lots of different clouds? Stratocumulus clouds belong to the Low Cloud (surface-2000m) group. Stratocumulus clouds will usually be found in groups and very rarely will be seen as a singular cloud. cumulogenitus (cugen), (Mother cloud)+mutatus (e.g. An example of data being processed may be a unique identifier stored in a cookie. Youll see both of these clouds at the same altitude but you should be able to differentiate these clouds easily as stratus clouds are featureless darker clouds, while stratocumulus clouds have a surplus of features. 2. Only light rain (usually drizzle) falls from stratocumulus clouds. While you might not recognize stratocumulus clouds by the name, Im sure youd recognize them in the sky. The bottom of cumulus clouds are fairly close to the ground. Cumulus congestus clouds extend into the middle troposphere, while deep, precipitating cumuliform clouds that extend throughout the troposphere are called cumulonimbus. Stratocumulus clouds have more variety than any of the ten major cloud types. Nimbostratus clouds are generally featureless and dont have any associated cloud species or varieties, while stratocumulus clouds have plenty to go around. Thus, the 10 types are: Low-level clouds (cumulus, stratus, stratocumulus) that lie below 6,500 feet (1,981 m) Middle clouds (altocumulus, nimbostratus, altostratus) that form between 6,500 and 20,000 feet (1981-6,096 m) Stratocumulus clouds are low, puffy and gray. However, if the layers become tufted in appearance due to . Historically, in English, this type of cloud has been referred to as a twain cloud for being a combination of two types of clouds. Middle clouds include Altostratus, altocumulus, and nimbostratus clouds. If any, they might bring a light rain or drizzle. I would definitely recommend Study.com to my colleagues. Stratus Clouds are the lowest-level clouds. These may organize into distinctive patterns which are currently under active study. . Stratocumulus Cumulomutatus the specific type of stratocumulus clouds, are flat and elongated. Stratocumulus cloud consists of large, rounded masses of stratus that form groups, lines or waves. Stratocumulus castellanus may develop into cumulus congestus (and even further into cumulonimbus) under auspicious conditions. To unlock this lesson you must be a Study.com Member. Stratocumulus clouds are low, lumpy, and gray. Like its 'middle-level brother' the However, if the conditions are right, they can turn into nimbostratus clouds, which are dark gray clouds that typically produce rain or snow. The 'extreme cruelty' around the global trade in frog legs, What does cancer smell like? How did this mountain lion reach an uninhabited island? Any opinions, findings and conclusions or recommendations expressed in this material do not necessarily reflect the views of the National Science Foundation. Youll be happy to know that if you see these clouds in the sky precipitation is uncommon so you wont need your umbrella. Altocumulus clouds usually form in groups and are about one kilometer thick. Stratocumulus clouds have six supplementary features: asperitas, cavum, fluctus, mamma, praecipitatio, and virga. On this Wikipedia the language links are at the top of the page across from the article title. Its very rare that youll find stratocumulus clouds precipitating. Corrections? What Are Climate Feedback Loops? Cumulonimbus clouds are also called . OK. Stratocumulus (Sc) - the name derives from the latin words stratus = flattened layer or spread out and cumulus = mass or heap. Its also important to note that both clouds dont share any cloud species or varieties besides the radiatus cloud variety. Their altitude however differentiates them the most, with stratocumulus clouds being closer to the ground. Aerial photograph of Stratocumulus perlucidus clouds over the midwestern United States, Precipitation-based supplementary features, Learn how and when to remove this template message, "International cloud atlasDefinitions of clouds", "Possible climate transitions from breakup of stratocumulus decks under greenhouse warming", "Solar geoengineering may not prevent strong warming from direct effects of CO2 on stratocumulus cloud cover", "Extreme CO2 levels could trigger clouds 'tipping point' and 8C of global warming", "A world without clouds? The menacing, magnificent storm clouds of Wyoming come to swirling life in this time-lapse, "Stormscapes," by photographer Nicolaus Wegner. 'Dull weather' is a common expression incorporated with overcast stratocumulus days, which usually occur either in a warm sector between a warm and cold front in a depression, or in an area of high pressure, in the latter case, sometimes persisting over a specific area for several days. The aurora borealis generally occurs five to 20 miles above the Earth's surface. - Lesson for Kids, Seasons of the Year Lesson for Kids: Definition & Facts, Jet Stream Lesson for Kids: Definition & Facts, Chemical Weathering Lesson for Kids: Definition & Examples, Rain Gauge Lesson for Kids: Definition & Facts, Montserrat Volcano Facts: Lesson for Kids, The Tornado Fujita Scale: Lesson for Kids, How Does a Hurricane Form? Mid-level clouds are usually gray and are identified as either altocumulus, altostratus, or nimbostratus. They also provide precipitation and signal weather changes and patterns. All rights reserved, The building blocks of clouds are water and particles, fluffy formations we see suspended in the sky, create some order scientists have established three broad categories, organize clouds into ten broad categories, lenticular clouds resemble stacks of giant disks. Large uncertainties . Both stratocumulus and cumulus clouds are found at the same height, but stratocumulus clouds are more of a layer cloud than a cumulus cloud, usually found in conjoined groups or clumps of clouds. When does spring start? The clouds that cause thunderstorms are called stratocumulus clouds. They are low-level clouds that can be found between 2,000-6,500 feet above the. Remember, if youre trying to decide between an altostratus and stratocumulus cloud, and the cloud being observed has been determined to have an associated cloud species, its not an altostratus cloud. cumulomutatus (cumut), This page was last edited on 8 February 2023, at 07:40. There are three main cloud types. Cumulonimbus - Large clouds with dark bases and tall billowing towers. It is a Explore Earth and Space With Art - Now Including Mars! Cloud Identification Viewer and Matching Information CardsIncludes:8 Cloud types - Cirrocumulus, Cirrus, Cirrostratus, Cumulus, Altocumulus, Stratocumulus, Stratus, Cumulonimbus,1 Window Viewer8 Matching Information cards (Cloud Height, Information & Weather Predictions)Perfect as a starter activity for a Weather UnitReggio, Montessori, Waldorf, Steiner. They produce little or no precipitation, but sometimes indicate when the weather is going to change. You can identify them in the sky because they look like lumpy rows of cottons balls. Stratocumulus clouds tend to be much closer to the ground than altocumulus clouds which usually makes stratocumulus clouds seem both darker and bigger than altocumulus clouds. Altostratus clouds are generally a featureless layer cloud, whereas stratocumulus clouds have more detail. 4. Those are called mammatus clouds. (https://youtu.be/r_S_bSENfXc), Everything You Need To Know About The Elements Of Weather And Climate. They are formed when warm, moist air rises into the atmosphere. If you have a barometer, measure the air pressure and write it down. If you have a thermometer, measure the temperature and write it down. You can learn even more about clouds and how they relate to the weather by tracking temperature, pressure and cloud data over time. They attract water vapor and as they ascend the vapor condenses to form liquid water or ice, which results in the formation of tiny globules called cloud droplets. The term status refers to a sheet or a layer. But if youre deciding between a stratus and stratocumulus cloud, remember that stratus clouds are generally featureless layer clouds. Hence, stratocumulus cloud formations are seemingly bigger, and are generally a bit darker than altocumulus clouds. They are typical for polar countries or warmer climate during winter seasons. What if we could clean them out? Theyre a layer of puffy clouds, and can usually be found joined together, similar to altocumulus clouds. Stratocumulus clouds are low, lumpy, and gray. Low clouds fall into four divisions: cumulus, stratus, cumulonimbus, and stratocumulus. Finally, closest to Earths surface are low clouds, which hover at or below 6,500 feet. Most often they produce no precipitation, but if they do, it's usually only light rain or snow. [4], Stratocumulus Undulatus clouds appear as nearly parallel waves, rolls or separate elongated clouds, without significant vertical development.[4]. Sc stratiformis during winter indicate high pressure and stable winter weather without or only light precipitation. (surface-2000m) group. And thats everything you should need to know about stratocumulus clouds, hopefully now identifying these cloud types should be much easier. How about those pouch-like protrusions bulging from underneath larger clouds? Thin stratocumulus clouds are also often the cause of corona effects around the Moon at night. This equates to roughly 6,000 to 20,000 feet in altitude. This often occurs in late morning in areas under anticyclonic weather, the stratocumulus breaking up under the sun's heat and often reforming again by evening as the heat of the sun decreases again. These clouds sometimes produce light rain or drizzles. Sometimes they line up in rows and other times they spread out. Low clouds fall into four divisions: cumulus, stratus, cumulonimbus, and stratocumulus. Seism is another word for earthquake. The roughly 5,000-year-old human remains were found in graves from the Yamnaya culture, and the discovery may partially explain their rapid expansion throughout Europe. They occur at 6000-18,000 feet in elevation. All rights reserved. Stratocumulus clouds are low-level clouds, puffy and gray in color. Nimbostratus is a member of the ten fundamental cloud types (or cloud genera). Stratocumulus clouds have seven associated cloud species: duplicatus, lacunosus, opacus, perlucidus, radiatus, translucidus, and undulatus. Altostratus clouds are the second type of stratus clouds. Definition: Gray, featureless low-altitude layer cloud capable of ground contact. They often look like ragged tufts. Looking up at the sky youve probably noticed clouds. See also cloud classification. It is remarkable that such a thin cloud can extend practically unbroken for a thousand kilometers, but strong negative feedbacks exist to constrain cloud thickness. Updated: 09/26/2021 . Read the list below to learn about the different types of clouds, what they look like and where they appear in the sky. Thicker, dark gray, and somewhat conjoined heaps of clouds. So if you love cloud watching, youll have a great time while these clouds are in the sky due to their diversity and many different looks. Are There Differences Between A Twister And A Tornado? A dichotomous key is a tool scientists (and you!) Stratocumulus Radiatus clouds appear as the same as stratocumulus undulatus, but stratocumulus undulatus move perpendicular to the wind shear, while stratocumulus radiatus move parallel to the wind shear. The study estimated that this would cause a surface warming of about 8C (14F) globally and 10C (18F) in the subtropics, which would be in addition to at least 4C (7.2F) already caused by such CO2 concentrarions. Ever see one that looks like undulating waves? Stratocumulus Asperitas is a rare, newly recognized supplementary feature that presents itself as chaotic, wavy undulations appearing in the base of a stratocumulus cloud cover. This is a term used to denote a class of clouds that are flat and featureless capable of producing slight drizzles. In fact, they resemble rows of cotton balls. There are 5 different species of stratocumulus clouds: Of these species, there are then seven varieties of stratocumulus clouds. It can make the day feel dull and grey. All other trademarks and copyrights are the property of their respective owners. 6. So go ahead, go outside and see which species and features of stratocumulus clouds you can see! No matter what shape or size they are, clouds are essential to life on Earth. Can have sharp well defined edges or an anvil shape at the top. These clouds are low, lumpy, and gray. Sometimes the patches are merged. Stratocumulus clouds are often mistaken for rain clouds when in reality, it is quite rare to get anything more than the lightest drizzle from them, if anything at all, Verification, impacts and post-processing, Climate information for international development, Science for Impacts, Resilience and Adaptation (SIRA), Atmospheric processes and parametrizations, Regional model evaluation and development, Environmental Hazard and Resilience Services, National Meteorological Library & Archive. 2004 Indian Ocean Tsunami: Lesson for Kids, Psychological Research & Experimental Design, All Teacher Certification Test Prep Courses, Overview of Astronomy for Elementary School, Branches of Science for Elementary School, Overview of Geology for Elementary School, Wildfire Lesson for Kids: Definition & Facts, Why Do We Have Seasons? If the cloud you are looking at has accompanying clouds species then it wont be an altostratus cloud. This website uses cookies. In addition, stratocumulus clouds would not reform until the CO2 concentrations drop to a much lower level. Stratocumulus usually occur as a distinct extensive layer or sheet of grey to white low clouds, in the form of more or less regular clumbs or patches often arranged in bands or rolls that lie across the wind. They come in various cloud species that describe forms of rising turret formations (castellanus), wooly locks (floccus), smooth lens shaped (lenticularis), layer form blanketing the sky (stratiformis), and even as a roll cloud (volutus). These are called contrails. Stratocumulus also can be thought of as a layer of cloud clumps with thick and thin areas. They also can be formed by winds passing hills or mountains, such as Foehn winds, and in this case they can be very regularly shaped. Altocumulus clouds can form anywhere from 2,000 meters to 6,000 meters above the ground. This is the main precipitating type, however any rain is usually light. Only light precipitation, generally in the form of drizzle, occurs with stratocumulus clouds. At night they act as a blanket to keep us from getting too cold. Stratocumulus Virga is a form of precipitation that evaporates in mid-air and doesn't reach the ground. Its fair to say that stratocumulus clouds are diverse as theyre capable of many different looks. Stratocumulus - Low clouds with irregular masses of clouds, rolling or puffy in appearance, sometimes with space between the clouds. 7. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. They look very similar to altocumulus, but much larger sized groups. So, if you're lying in the grass looking up, they might be some of the first ones you see because they are closer to the Earth. Stratocumulus clouds can be present in all types of weather conditions, from dry settled weather to more rainy conditions, but they themselves are often not the culprit. Kelley has been teaching middle school for six years and has a master's degree in educational administration. The latest breakthroughs, research and news from the Met Office. The sky appears blue to the human eye as the short waves of blue light are scattered more than the other colours in the spectrum, making the blue light more visible. Read about how we use cookies. I feel like its a lifeline. Altocumulus clouds are typically found in groups or heaps clumped together. Clouds Formed by Air Being Forced to Rise. This arguably makes for exciting time watching the sky. Within each of these three tiers, scientists further organize clouds into ten broad categories based on the general shapes the clouds take. Cumulus clouds are a cloud-spotting favorite: They are big, white, and cottony anddepending on your . Undergrad Student Login High clouds include cirrus, cirrocumulus, and cirrostratus clouds. What do stratocumulus tell about the weather? You can help NASA scientists studying clouds! stratocumulus. Thats called a Kelvin-Helmholtz cloud, named for the physicists who first studied its flowing formation. Stratocumulus Stratocumulus (Sc) - the name derives from the latin words stratus = flattened layer or spread out and cumulus = mass or heap. While clouds are similar in many ways, there are lots of different types and they form in different ways. These animals can sniff it out. From giant puffs billowing toward the sun to thin wisps slinking past the moon, clouds come in countless shapes and sizes. [8], However, because large eddy simulation models are simpler and smaller-scale than the general circulation models used for climate projections, with limited representation of atmospheric processes like subsidence, this finding is currently considered speculative. Answer the questions on this dichotomous key to identify what types of clouds are in the sky. Stratocumulus Cloud Supplementary Features, What Are The Best Home Weather Stations? They also can occur under altostratus cloud preceding a warm or occluded front, when cumulus usually lose vertical development as the sun's heat decreases. Cumulonimbus. (Optional) graph paper (for graphing temperature and/or pressure measurements). To distinguish between a stratocumulus and an altocumulus cloud, point your hand toward the cloud. Stratocumulus clouds are typically 200-400 m thick and usually occur at the top of the boundary layer below a thermal inversion. During the day they help protect us from the suns intense heat. Stratocumulus clouds are low-level clumps or patches of cloud varying in colour from bright white to dark grey. Colorful clouds and calm water create a striking sunset scene for canoeists on Winisk River in Ontario, Canada. To distinguish between a
Its like a teacher waved a magic wand and did the work for me. Most of us can probably remember a time when we were lying in the grass and gazing up at the blue sky. Continue with Recommended Cookies. Scientifically it is found that the clouds are made up of water molecules which are very tiny and their weight is negligible. Stratocumulus is also often, though not always, darker in colour than altocumulus. They are distinct from other stratocumulus by puffy tower-like formations atop the cloud layer. Stratocumulus undulatus clouds, seen from an airplane, Stratocumulus undulatus asperitas clouds, seen from Earth, Stratocumulus duplicatus; Stratocumulus stratiformis (right) and Stratocumulus floccus (left), Stratocumulus Mamma is a type of mammatus cloud.[5].