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Topic: Altocumulus castellanus

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In the News (Fri 19 Apr 19)

  clouds, their types and what it means
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.
www.pilotfriend.com /av_weather/meteo/clouds.htm   (8682 words)

 Altocumulus cloud - Wikipedia, the free encyclopedia
An Altocumulus is a cloud belonging to a class 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.
Altocumulus often are seen preceding a cold front, and their presence on a warm, humid, summer morning frequently signals the development of thunderstorms later in the day.
Altocumulus lenticularis often forms in the lee of mountains.
en.wikipedia.org /wiki/Altocumulus   (182 words)

Altocumulus undulatus occurs when a layer of altocumulus cloud is affected by wind shear.
Altocumulus undulatus is distinguished from altostratus undulatus by its discernible cumuliform texture.
As with altocumulus formations in general, mackerel sky is produced by the lifting of a large, moist air mass, usually by an approaching cold front, combined with instability at cloud level.
www.theairlinepilots.com /met/clouds.htm   (6588 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.
Castellanus clouds are evidence of mid-atmospheric instability and a high mid-altitude lapse rate.
en.wikipedia.org /wiki/Altocumulus_castellanus   (191 words)

 AIRMAP | Weather Toolbox | Cloud Classification
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)

 BBC - Weather Centre - Types of Cloud - Stratocumulus and Altocumulus
There is no great difference in the properties of stratocumulus and altocumulus since both are composed of water droplets and are normally limited in vertical extent, so the distinction is rather an arbitrary one.
Altocumulus also provides a sort of dappled pattern, but since it is at a greater altitude the cloud elements look smaller.
There are many variations on the theme including altocumulus castellanus which is like a vigorous medium-level cumulus (this type of cloud is sometimes an indication that thunderstorms will follow).
www.bbc.co.uk /weather/features/stratocumulus.shtml   (315 words)

 AMS Glossary
Cirrus castellanus differs from cirrocumulus castellanus in that its vertical protuberances subtend an angle of more than 1° when observed at an angle of more than 30° above the horizon.
When altocumulus castellanus and stratocumulus castellanus attain a considerable vertical development, they become cumulus congestus and often develop into cumulonimbus.
Stratocumulus castellanus should not be confused with stratocumulus pierced by cumulus.
amsglossary.allenpress.com /glossary/search?id=castellanus1   (171 words)

 Australian Weather Photography - Cloud Classification Definitions
Altocumulus in the form of flat lens that usually form as a result of the wind flow over mountains.
Altocumulus in the form of globules or ripples.
Altocumulus clouds in patches, sheets or layers, that exhibit undulations.
australiasevereweather.com /photography/define1.htm   (437 words)

 Cloud types Summary
Depending on thickness, altocumulus clouds often have white or gray layers that appear in washboard or wave-like formations.
Atmospheric instability and convective air currents can result in the formation of altocumulus castellanus clouds, a form of altocumulus that often appear as isolated cumulous clouds with billowing tops.
Another form of altocumulus cloud, a standing lenticular altocumulus clouds, is formed by turbulent updrafts of air uplifted by terrain barriers (e.g., mountains, ridges, etc.).
www.bookrags.com /Cloud_types   (2040 words)

 Appendix E - III
Clouds of the genera Altocumulus, Altostratus, and Nimbostratus
Altocumulus, the greater part of which is semitransparent; the various elements of the cloud change only slowly and are all at a single level
Altocumulus with sproutings in the form of small towers or battlements, or Altocumulus having the appearance of cumuliform tufts
www.ofcm.gov /fmh3/text/appen-e3.htm   (2504 words)

 C.A.S. Cloud of the Month   (Site not responding. Last check: 2007-10-11)
The mid-level cloud known as ‘Altocumulus’ often takes the form of smooth rounded masses that look like a tray of bread rolls.
It is then known as Altocumulus ‘castellanus’, since its tops resemble the crenellations of castle battlements.
Altocumulus castellanus can appear when the air is ‘unstable’ in the middle of the troposphere (this is the lower part of our atmosphere – in which weather happens).
www.cloudappreciationsociety.org /a/cloud-month/06-cld_mth_sept.html   (224 words)

 Cumuliform clouds: some examples   (Site not responding. Last check: 2007-10-11)
Altocumulus are cumulus clouds not resulting from heating on the ground, i.e.
In this case (castellanus), the clouds are shaped like turrets, indicating convective motion in weak shear.
Thunderstorms are possible on days with Ac castellanus, if surface-based convection can connect to the mid-tropospheric unstable layer.
www-das.uwyo.edu /~geerts/cwx/notes/chap08/cumuliform.html   (362 words)

 Weather Glossary - A
altocumulus lenticularis Virga may also fall from these clouds.
A middle cloud with vertical development that forms from altocumulus clouds.
It is composed primarily of ice crystals in its higher portions and characterized by its turrets, protuberances, or crenelated tops.
www.cagenterprises.com /wx_glossary_a.html   (1918 words)

 Weather Tutorial Altocumulus Page   (Site not responding. Last check: 2007-10-11)
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)

 Clouds - 8
This illustrates Cumulus below the flight level and Altocumulus castellanus above at 14,000 - 18,000 ft; the aircraft ran into thundery weather soon after this photograph was taken.
Illustrated here is a layer of Altocumulus over the Mediterranean (the mountains of Corsica can be seen clear of the cloud).
There has been a big increase in Cirrus and the Altocumulus has thickened and lost its rounded tops, as it develops into Altostratus.
www.maracsko.com /aviation/airbpclouds/aerialpics.html   (173 words)

 InterSites: Altocumulus   (Site not responding. Last check: 2007-10-11)
When viewed from the ground, the size of individual elements will have an apparent width of 1 to 5° when at an elevation greater than 30° (the width of one to three fingers at arm's length).
Even if the elements appear smaller than this the cloud is still classified altocumulus if it shows shading.
On rare occasions, a thunderstorm may occur from one type of Ac known as altocumulus castellanus - so called because in outline, the cloud tops look like a series of turrets and towers along a castle wall.
www.intersites.co.uk /81726   (175 words)

 LiveScience.com - New Stamps Highlight Cool Clouds
Small heaps arranged in layers or sheets, altocumulus stratiformis clouds are primarily composed of water droplets and, as depicted here, reflect glorious colors at sunset.
Resembling ripples on water, altocumulus undulatus clouds result from wind shear-wind speed or direction that changes sharply with height.
Smooth, almost motionless altocumulus lenticularis clouds resemble lenses and may be iridescent.
www.livescience.com /othernews/041110_cloud_stamps.html   (1019 words)

 Cirrus (CI)
Altocumulus stratiformis is by far the most common
cloud, is a good example of the species altocumulus
Both cirrus floccus and cirrus castellanus may have ice
www.tpub.com /content/aerographer/14269/css/14269_34.htm   (480 words)

 Amazon.com: "altocumulus lenticularis": Key Phrase page   (Site not responding. Last check: 2007-10-11)
somewhat misleading, because cumulus clouds are normally associated with con- vection and instabili- ty, but stratocumulus lenticularis (and the similar altocumulus lenticularis and cir- rocumulus lenticu- laris)...
Lenticular wave clouds (Altocumulus lenticularis), formed by the wave motion of rising and falling air pockets over mountainous terrain, create strange flying saucer or lens-shaped...
known formally as altocumulus lenticularis, are lens-shaped clouds that form at or around mountain peaks due to a...
www.amazon.com /phrase/altocumulus-lenticularis   (434 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)

 Cumulus congestus cloud - Wikipedia, the free encyclopedia (via CobWeb/3.1 planetlab2.cs.unc.edu)   (Site not responding. Last check: 2007-10-11)
Because cumulus congestus is produced by strong updrafts, it is typically taller than it is wide, and cloud tops can reach 5,000 metres (15,000 ft).
Cumulus congestus clouds are formed by the development of cumulus mediocris generally, though they can also be formed from altocumulus castellanus or stratocumulus castellanus as well.
Altostratus (As) • Altostratus undulatus • Altocumulus (Ac) • Altocumulus undulatus • Altocumulus mackerel sky • Altocumulus castellanus cloud • Altocumulus lenticularis
en.wikipedia.org.cob-web.org:8888 /wiki/Cumulus_congestus_cloud   (219 words)

 Altocumulus Castellanus clouds photographs photography photos pictures clouds images
Altocumulus Castellanus clouds photographs photography photos pictures clouds images
Altocumulus Castellanus - Photographs of altocumulus castellanus clouds [ac]
Keywords: Altocumulus Castellanus, clouds, photographs, photography, photos, pictures, clouds, images
www.australiasevereweather.com /photography/altocucastellanus01.html   (51 words)

 Altocumulus Hybrid   (Site not responding. Last check: 2007-10-11)
A field of altocumulus clouds moved overhead shortly after sunrise, in an environment of very steep lapse rates (a lot of middle level instability!), and fast flow.
Short towers can be seen above a few of the formations in the group, especially at upper middle right.
Unlike "pure" altocumulus castellanus, however, these featured wavy, undulating and almost laminar bases reminiscent of lenticularis, with some periodicity between cloud clumps like one would expect with undulatus.
www.stormeyes.org /tornado/SkyPix/undulatu.htm   (138 words)

The cloud types shown on the stamp pane are: Cirrus radiatus, Cirrostratus fibratus, Cirrocumulus undulatus, Cumulonimbus mammatus, Cumulonimbus incus, Altocumulus stratiformis, Altostratus translucidus, Altocumulus undulatus, Altocumulus castellanus, Altocumulus lenticularis, Stratocumulus undulatus, Stratus opacus, Cumulus humilis, Cumulus congestus and Cumulonimbus with tornado.
Clouds develop when moist air cools to its dew point by rising to a higher altitude or by moving over a cooler surface.
Altocumulus stratiformis, ©1988 Scott T. Smith, Logan, UT Altostratus translucidus, ©Richard A. Keen, Golden, CO Altocumulus undulatus, ©H. Michael Mogil, Rockville, MD Altocumulus castellanus, ©1992 Arjen & Jerrine Verkaik/SKYART, Elmwood, Ontario, Canada
www.usps.com /communications/news/stamps/2004/sr04_062.htm   (1821 words)

 Altocumulus - Wikimedia Commons
Unstable altocumulus showing a turreted appearance with some virga
Altocumulus stratiformis with tree (little cirrostratus in the background)
This page was last modified 08:05, 20 October 2006.
commons.wikimedia.org /wiki/Altocumulus   (45 words)

Some light rain or snow may fall from thick altostratus.
There is usually little turbulence associated with middle clouds unless cumulus clouds are embedded in them or unless altocumulus is developing.
The bases of low clouds range from surface height to about 6500 feet.
www.allstar.fiu.edu /aerojava/fltenv3.htm   (5175 words)

 Daily weather log for the month of September
Monday - Overcast cumulus, cirrus, altocumulus ceiling 2,000, visibility 15, 3º, wind 14 knots
2004 1200 Wednesday - Scattered cumulus 1/8th 3,600 altocumulus castellanus 1/8th 7.000, cirrus 1/8th 22,000,
Wednesday - Scattered cumulus 2/8th 2,400, altocumulus 7/8th 9,500, cirrostratus 2/8ths 24,000,
www.ftlcomm.com /ensign/weatherLog/09.html   (3041 words)

 Clouds: Messengers of the Weather   (Site not responding. Last check: 2007-10-11)
A frontal system of heavy thunderstorms is known as a A) thermal line; B) squall line; C) castellanus line; D) corona line.
Because of the way they are formed, which cloud type will remain stationary in the sky as long as the wind speed remains constant?
A) cirrocumulus; B) altocumulus lenticularis; C) altocumulus castellanus; D) nimbostratus.
oregonstate.edu /~haggertr/GEO102/Clouds_video.htm   (258 words)

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