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Topic: Altocumulus

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In the News (Mon 22 Apr 19)

  MID CLOUDS   (Site not responding. Last check: 2007-08-20)
Clouds of the middle level etage are usually of the altocumulus or altostratus type with bases normally in the range from 6,500 feet to 23,000 feet (2,000 to 6,000 meters).
Altocumulus clouds are white, grey, or both white and grey, in patches, a sheet or in a layer, generally with shading in rounded masses, rolls, etc. which are sometimes partly fibrous or diffuse and which may or may not be merged.
Altocumulus clouds are, at least in the main, almost invariably composed of some water droplets.
www.met.tamu.edu /class/Metr304/Exer10dir/midclouds.html   (406 words)

 Altocumulus castellanus cloud - Wikipedia, the free encyclopedia
Altocumulus castellanus is a family B type cloud.
Altocumulus castellanus is named for its tower-like projections that billow upwards from the base of the cloud.
The base of the cloud can form as low as 2,000 metres (6,500 feet), or as high as 6,000 metres (20,000 feet).
en.wikipedia.org /wiki/Altocumulus_Castellanus   (104 words)

 The cloud classification system (general)
Considering an example of altocumulus observed moving to the south east, because of development on the north and north-eastern side of the cloud band, the apparent direction may be more to the east.
Another form of altocumulus is the lenticular type where the altocumulus appears in the form of a lens.
The direction of the wind associated with lenticular altocumulus can be determined by considering the sharpest edge as the end of the cloud where the air is flowing in and the opposite end where the air is flowing out.
australiasevereweather.com /techniques/moreadv/class.htm   (5094 words)

 Altocumulus Clouds: parallel bands or rounded masses   (Site not responding. Last check: 2007-08-20)
Typically a portion of an altocumulus cloud is shaded, a characteristic which makes them distinguishable from the high-level cirrocumulus.
Altocumulus clouds usually form by convection in an unstable layer aloft, which may result from the gradual lifting of air in advance of a cold front.
The presence of altocumulus clouds on a warm and humid summer morning is commonly followed by thunderstorms later in the day.
ww2010.atmos.uiuc.edu /(Gh)/wwhlpr/altocumulus.rxml?hret=/guides/mtr/cld/cldtyp/home.rxml   (79 words)

 AIRMAP | Weather Toolbox | Cloud Classification   (Site not responding. Last check: 2007-08-20)
Altocumulus standing lenticular (ACSL): AC in the form of semitransparent patches (often fish-shaped, almond-shaped, or lenticular) continuously changing in appearance and occurring at one or more levels.
Altocumulus (AC) at two or more levels, not progressively invading the sky; or, opaque AC at one level, not progressively invading the sky; or, altostratus (AS) or nimbostratus together with AC.
Altocumulus Castellanus (ACC): Altocumulus in the form of turrets or battlements or AC having the appearance of small cumuliform tufts, with or without altostratus (AS) or nimbostratus (NS).
www.ccrc.sr.unh.edu /~stm/AS/Weather_Toolbox/Cloud_Classification.html   (525 words)

 Middle Cloud Classification
Altocumulus, the greater part of which is semi-transparent; the various elements of the cloud change only slowly and are all at a single level.
Altocumulus with sproutings in form of small towers or battlements, or Altocumulus having the appearance of cumuliform tufts.
Altocumulus, Altostratus and Nimbostratus invisible owing to darkness, fog, blowing dust or sand or other similar phenomena, or more often because of the presence of a continuous layer of lower clouds.
www.atmos.washington.edu /gcg/MG/tepps/SPOON/photoen/cm.code.html   (339 words)

 Met Office: CM8 Altocumulus with tufts or sproutings
Altocumulus floccus clouds (top photograph) occur as white or grey scattered tufts with rounded and slightly bulging upper parts.
Altocumulus floccus sometimes results from the dissipation of the base of altocumulus catellanus and may itself dissipate, leaving behind very white trails of cirrus.
Altocumulus with sproutings in the form of small towers or battlements or having the appearance of cumuliform tufts.
www.metoffice.gov.uk /bookshelf/clouds/cm8   (202 words)

The sky seen here is commonly seen and shows how an altocumulus layer can cover most of the sky, whereas some parts are empty and blue.
The typical altocumulus pattern is not very clear even though a pattern of direction towards the horizon is seen.
An altocumulus layer doesn't have to be evenly spread across the sky.
www.chitambo.com /clouds/cloudshtml/altocumulus.html   (205 words)

 Met Office: CM7 Altocumulus with As or Ns
The clouds may occur as a single or a multiple layer, showing partly the characteristics of altocumulus and partly those of altostratus or nimbostratus.
This type of sky results from transformation processes by which altocumulus changes locally and acquires the appearance of altostratus/nimbostratus, or altostratus/nimbostratus breaks to altocumulus.
Altocumulus and altostratus at the same level are depicted in the top photograph.
www.metoffice.gov.uk /bookshelf/clouds/cm7with   (229 words)

 Aktuelle Wetterinformationen - Meteorologie Kvln   (Site not responding. Last check: 2007-08-20)
Altocumulus, the greater part of which is semi-transparent; the various elements of the cloud change only slowly and are all at a single level (Ac)
Patches (often in the form of almonds or fishes) of Altocumulus, the greater part of which is semi-transparent; the clouds ocurr at one or more levels and the elements are continually changing in appearance
Altocumulus in two or more layers, usually opaque in places, and not progressively invading the sky; or opaque layer of Altocumulus, not progressively invading the sky; or Altocumulus together with Altostratus or Nimbostratus
www.uni-koeln.de /math-nat-fak/geomet/meteo/forschung/statmod/7-e.html   (202 words)

 Cloud photographs by Dave Parker (FRMetS)
This is Altocumulus - high level convective cloud - and often associated with poor weather.
This looks cosy but the altocumulus which was reflecting the low sun, was an early warning of poor weather.
Varieties of altocumulus, namely floccus and castellanus, are very accurate predictors for thundery activity in a day or two.
www.invectis.co.uk /cloud/cloud.html   (1155 words)

 Weather Pictures and Storm Chasing - Altocumulus clouds   (Site not responding. Last check: 2007-08-20)
Altocumulus: These clouds form between 6000 and 20000 feet (1,8 and 6 km) above sealevel and appear as gray, puffy blobs, sometimes rolled out in parallel waves or bands.
One part of the cloud is usually darker than the rest, which helps distinguish this cloud from the higher cirrocumulus clouds.
Altocumulus clouds that look like "little castles" in the sky (castellanus) indicate rising air at the cloud level.
www.weatherpictures.nl /altocumulus.html   (139 words)

Altocumulus (coarse lamb) clouds typically form at the edge of a large, ascending air mass.
The clouds, made up of ice particles and/or very small water droplets, are usually sharply outlined and often appear as lumps.
Mackerel skies are typically comprised of altocumulus clouds.
www.shsu.edu /~geo_jwt/oncampusans/Clouds/01Altocumulus/altocumulus.htm   (220 words)

 Weather Tutorial Altocumulus Page   (Site not responding. Last check: 2007-08-20)
While low-level cumulus clouds form in air rising from heated areas on the ground, altocumulus clouds arise from unstable middle-layer air masses.
The bases of these clouds are usually found around 6,500 to 23,000 feet.
In a variation of these clouds, the altocumulus castellanus, the individual puffs are more turret-shaped than rounded, indicating in increased amount of convection.
virtualskies.arc.nasa.gov /weather/tutorial/altocumulus.html   (75 words)

 Met Office: CM6 Ac from spreading out of Cu
Occasionally, after a temporary spreading out, upward growth is resumed in places, so that that altocumulus appears on the side of the cumulus.
Altocumulus never has the fibrous structure, silky sheen or whiteness of the anvil of cumulonimbus.
Altocumulus cumulogenitus (Ac cugen) or Altocumulus cumulonimbogenitus (Ac cbgen).
www.met-office.gov.uk /bookshelf/clouds/cm6   (241 words)

 Altocumulus Clouds: parallel bands or rounded masses
Altocumulus clouds are composed primarily of water droplets and are located between 6,500 and 20,000 feet (2,000 to 6,000 meters) above the ground.
Also found at mid-levels are altostratus clouds, which are often confused with high-level cirrostratus.
In fact, the sun (or moon) is only vaguely visible through altostratus clouds and appears as if it were shining through frosted glass.
ww2010.atmos.uiuc.edu /(Gh)/guides/mtr/cld/cldtyp/mdl/altcu.rxml   (167 words)

 texasweather @ MindSay
Altocumulus and altostratus were the dominant cloud types.
There was nimbostratus clouds in the morning, which produced a rain shower, changing to a mix of stratocumulus and altocumulus from late morning to late afternoon, then another shower fell from a stratocumulus cloud.
There were a few altocumulus patches in the morning, changing to a mix of cirrus, cirrostratus, cirrocumulus, and altocumulus by onn, and becoming all altocumulus and cirrus by afternoon.
texasweather.mindsay.com   (881 words)

 Cloud Chart
Altocumulus clouds consist of a patterned, greyish cloud deck with a rounded shape.
Altostratus show very little texture and can be distinguished from cirrostratus by their lower height and thicker appearance.
Altostratus and Altocumulus are often seen together and give the sky a chaotic look.
www.geocities.com /stormchsr77/Chart.html   (704 words)

 Plymouth State Meteorology Program Cloud Boutique
Altocumulus have distinct cloud elements and are either in a patchy, scattered distribution or can appear in linear bands.
The altocumulus in this photo by Jay Shafer consists of a number of individual cloud elements.
Altostratus have a more uniform and diffuse coverage where it is difficult to detect individual elements or features.
vortex.plymouth.edu /clouds.html   (1686 words)

 Australian Cloud Atlas - Medium Level Clouds
Altocumulus - the streak through the middle was possibly caused by a plane.
Altostratus on the highest level, the middle cloud is Altocumulus Undulatus with some lenticular properties, this cloud was also iridescence to the naked eye, but did not survive the camera lens.
Often found on the lee side of mountains during strong winds, as was the case here.
ozthunder.com /photo/alto.htm   (76 words)

 Cloud Identification Page
Most often associated with altocumulus, but can be seen on stratocumulus, cirrus, and cirrocumulus.
These cloud elements are larger than those in altocumulus, and cirrocumulus.
Usually associated with altocumulus castellanus, but can be seen coming from low and high level clouds as well.
www.wxgeek.com /clouds   (699 words)

 Altocumulus Pics   (Site not responding. Last check: 2007-08-20)
More altocumulus, basically of the "standard" or "garden-variety" type.
Hard to see, but this view is of altocumulus at sunset.
There may be a cirrus layer in here as well.
www.ajfroggie.com /wxpics/acpics.htm   (47 words)

 Nimbostratus  (NS)
and  altocumulus  clouds  based  on  the  size  of  the
length, the cloud should be classified as altocumulus.
Altocumulus clouds appear white to light gray, or
www.tpub.com /content/aerographer/14269/css/14269_32.htm   (452 words)

 Middle CLOUDS-ALTOCUMULUS   (Site not responding. Last check: 2007-08-20)
Altocumulus clouds are a mixture of water and ice clouds.
They are likely to bring precipitation within 15 to 20 hours if wind is steady NE to S. Other wind directions bring overcast skies.
Precipitation is likely within 20 to 24 hours if the winds are from the NE E to S. Back to Cloud Types Page
www.geo.mtu.edu /department/classes/ge406/tjbrabec/altocumulus.html   (74 words)

 Climate / Weather Terms Glossary
An altocumulus showing vertical development, individual cloud elements have towerlike tops, often in the shape of tiny castles.
A lens-shaped altocumulus cloud; a mountain-wave cloud generated by the disturbance of horizontal airflow caused by a prominent mountain range.
A middle cloud composed of gray or bluish sheets or layers of uniform appearance.
www.wrcc.dri.edu /ams/glossary.html   (5931 words)

 [No title]   (Site not responding. Last check: 2007-08-20)
Altocumulus Lenticularis Associated with strong winds and standing waves in atmosphere
Altocumulus - bands of altocumulus clouds with cirrus filaments in the center
Altocumulus adding to the beauty of a glorious sunset
www.photolib.noaa.gov /historic/nws/nwind1.htm   (348 words)

 JetStream MAX - An Online Weather School: Mid-level Clouds - Altocumulus
Ac in the form of Cu-shaped tufts or Ac with turrets.
Altocumulus clouds are composed of flattened, thick, gray, globular masses.
They are middle level clouds comprised primarily of water droplets.
www.srh.noaa.gov /srh/jetstream/synoptic/m8.htm   (99 words)

 Altocumulus clouds at sunset after hurricane Gordon had passed Photographic Print by Brian Gordon Green at Art.com   (Site not responding. Last check: 2007-08-20)
Altocumulus clouds at sunset after hurricane Gordon had passed Photographic Print by Brian Gordon Green at Art.com
Digitally Printed on Archival Photographic Paper resulting in vivid, pure color and exceptional detail that is suitable for museum or gallery display
Altocumulus clouds at sunset after hurricane Gordon had passed
www.art.com /asp/sp.asp?PD=10250897&RFID=346898&engine=sitematch   (97 words)

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