userIds: [{ [5], Scientists have studied the characteristics of cirrus using several different methods. { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_topslot' }}]}, [45], Cirrostratus clouds can appear as a milky sheen in the sky[44] or as a striated sheet. These examples are from the Cambridge English Corpus and from sources on the web. The next set of clouds are the rain-bearing nimbostratus clouds. This means that the water remains a liquid, even at temperatures well below 0oC. { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_topslot_728x90' }}, iasLog("criterion : cdo_pt = entry"); { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_btmslot' }}, Two additional genera usually form in the low altitude range, but may be based at higher levels under conditions of very low humidity. {code: 'ad_topslot_a', pubstack: { adUnitName: 'cdo_topslot', adUnitPath: '/2863368/topslot' }, mediaTypes: { banner: { sizes: [[300, 50], [320, 50], [320, 100]] } }, 'increment': 0.05, { bidder: 'appnexus', params: { placementId: '11654174' }}, [22] If the cloud is a cirrus castellanus, there might be instability at the high altitude level. Balloon-carried hygrometers give information on the humidity of the cirrus cloud but are not accurate enough to measure the depth of the cloud. {code: 'ad_leftslot', pubstack: { adUnitName: 'cdo_leftslot', adUnitPath: '/2863368/leftslot' }, mediaTypes: { banner: { sizes: [[120, 600], [160, 600]] } }, Cirrocumulus clouds are high, thin, white clouds that remind me of wave patterns on shallow water or feather down. (The term cirrus also applies to certain interstellar clouds, composed of sub-micrometer-sized grains of dust . What does it say about the weather? { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_btmslot' }}]}, [2] Cirrus clouds are composed of ice crystals that originate from the freezing of super cooled water droplets in regions where air temperature is lower than -20 °C or -30 °C.Cirrus usually occur in fair weather. googletag.pubads().set("page_url", "https://dictionary.cambridge.org/dictionary/english/cirrocumulus"); "authorizationFallbackResponse": { 'max': 8, Cirrocumulus are usually white, but sometimes appear gray. { bidder: 'openx', params: { unit: '539971081', delDomain: 'idm-d.openx.net' }}, name: "unifiedId", Towards the top of the cloud, at temperatures of around −47 to −52 °C (−53 to −62 °F), the predominant crystal types are thick, hexagonal plates and short, solid, hexagonal columns. While they are not technically cirrus clouds, the dust clouds are referred to as "cirrus" because of their similarity to the clouds on Earth. Media in category "Cirrocumulus clouds" The following 105 files are in this category, out of 105 total. { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_rightslot' }}]}, [3] Based on satellite data, cirrus covers an average of 20% to 25% of the Earth's surface. iasLog("criterion : cdo_dc = english"); { bidder: 'appnexus', params: { placementId: '11654156' }}, googletag.pubads().setTargeting("cdo_pc", "dictionary"); dfpSlots['topslot_b'] = googletag.defineSlot('/2863368/topslot', [[728, 90]], 'ad_topslot_b').defineSizeMapping(mapping_topslot_b).setTargeting('sri', '0').setTargeting('vp', 'top').setTargeting('hp', 'center').setTargeting('ad_group', Adomik.randomAdGroup()).addService(googletag.pubads()); [17] In the tropics, these thunderstorms occasionally produce copious amounts of cirrus from their anvils. [8], Based on data taken from the United States using these methods, cirrus cloud cover was found to vary diurnally and seasonally. More rarely, cirrus clouds are capable of producing glories, more commonly associated with liquid water-based clouds such as stratus. Photos copyrighted by Cloud Chart, Inc., used by permission. They are not solid, but instead tend to have stepped funnels coming in from the ends. They are small rounded puffs that usually appear in long rows. name: "_pubcid", { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_topslot' }}, [14] Because humidity is low at such high altitudes, this genus-type tends to be very thin. { bidder: 'appnexus', params: { placementId: '11654157' }}, bidderSequence: "fixed" { bidder: 'sovrn', params: { tagid: '705055' }}, iasLog("setting page_url: - https://dictionary.cambridge.org/dictionary/english/cirrocumulus"); }); They also form from the outflow of tropical cyclones, and from the anvils of cumulonimbus clouds. The other two genera, cirrocumulus and cirrostratus, are also high clouds. From the Latin word lenticularis which means lens, cirrocumulus lenticularis appears like lens which are often elongated with clear boundaries. bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162036', zoneId: '776130', position: 'btf' }}, Moreover, they do not generate rainfall although they signify cold weather. Cirrocumulus undulatus has a wavy appearance, covering small parts of the sky. These clouds are formed from ice crystals, supercooled water droplets, or liquid water droplets. The cloud reflects this radiation back to the ground, thus enabling satellites to see the "shadow" it casts into space. {code: 'ad_topslot_b', pubstack: { adUnitName: 'cdo_topslot', adUnitPath: '/2863368/topslot' }, mediaTypes: { banner: { sizes: [[728, 90]] } }, iasLog("exclusion label : lcp"); In a cirrocumulus cloud, the cloudlets are usually lined up in a regular pattern. { bidder: 'ix', params: { siteId: '195467', size: [320, 100] }}, { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_topslot_728x90' }}, In the intermediate range, from 2,000 to 7,000 m (6,500 to 23,000 ft) in temperate regions, are the mid-étage clouds. Each cloudlet appears no larger than a finger held at arm's length. Convection at high altitudes can produce another high-based genus of cloud, cirrocumulus, with a pattern of small cloud tufts containing droplets of supercooled water. After accumulating enough information, Viñes began accurately predicting the paths of hurricanes, and he eventually summarized his observations in his book, Apuntes Relativos a los Huracanes de las Antilles. They are the same size or smaller than the width of your littlest finger when you hold up your hand at arm's length. 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. var mapping_rightslot2 = googletag.sizeMapping().addSize([746, 0], [[300, 250], [120, 600], [160, 600]]).addSize([0, 0], []).build(); { bidder: 'appnexus', params: { placementId: '11654157' }}, Someone or something that is ageless never looks older. Though indicating the arrival of precipitation, these clouds produce, themselves, at most fall streaks, whose ice crystals evaporate in warmer and drier air, without reaching ground level. Some polar stratospheric clouds can resemble cirrus, and noctilucent clouds typically become structured in ways[vague] similar to those of cirrus. { bidder: 'ix', params: { siteId: '555365', size: [120, 600] }}, Browse 1,671 cirrocumulus clouds stock photos and images available, or search for cirrus clouds or altocumulus clouds to find more great stock photos and pictures. 'min': 0, Shortly after this image was taken, the clouds began to stretch out and become more diffuse. CIRROCUMULUS . iasLog("exclusion label : resp"); They comprise two or three genera depending on the system of height classification being used: altostratus, altocumulus, and, according to WMO classification, nimbostratus. Cirrus fibratus looks striated and is the most common cirrus species. Who we are, what we do and organisational news. The length of each of these ice crystals is usually 0.25 millimeters long,[4] but they range from as short as 0.01 millimeters or as long as several millimeters. window.ga=window.ga||function(){(ga.q=ga.q||[]).push(arguments)};ga.l=+new Date; In winter, the cirrus cloud cover did not vary appreciably from day to night. If it forms in patches with cirrus or cirrostratus and the clouds spread across the sky, it usually means rain in 8–10 hours (can be more if the front is slow-moving). if(pl_p) Definition of Cirrocumulus (2.3.2.1) Thin, white patch, sheet or layer of cloud without shading, composed of very small elements in the form of grains, ripples, etc., merged or separate, and more or less regularly arranged; most of the elements have an apparent width of less than 1°. { bidder: 'onemobile', params: { dcn: '8a9690ab01717182962182bb50ce0007', pos: 'cdo_topslot_mobile_flex' }}, { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_MidArticle' }}, Cirrocumulus is a cloud of the stratocumuliform physical category that shows both stratiform and cumuliform characteristics and typically appears as white, patchy sheets with ripples or tufts without gray shading.