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Topic: Cumulonimbus

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In the News (Wed 24 Apr 19)

  Cumulonimbus Clouds
Cumulonimbus clouds are much larger and more vertically developed than cumulus clouds which form in a more stable atmosphere.
During the formation of the larger cumulonimbus, condensation droplets are carried up and down several times within the convection currents inside the cloud before being released, coalescing to form raindrops.
The largest cumulonimbus clouds of all are found in thunderstorms.
www.ace.mmu.ac.uk /eae/Weather/Older/Cumulonimbus_Clouds.html   (222 words)

  Cumulonimbus - Wikipedia, the free encyclopedia
Cumulonimbus is a type of cloud that is tall, dense, and involved in thunderstorms and other bad weather.
The base of a cumulonimbus can be several miles across, and it can be tall enough to occupy middle as well as low altitudes: though formed at an altitude of about 3,000 to 4,000 metres (10,000 to 12,000 feet), its peak can reach up to 23,000 metres (75,000 feet) in extreme cases.
Cumulonimbus are also characterized by a flat, anvil-like top (the anvil dome), caused by straight line winds at the higher altitudes which shear off the top of the cloud.
en.wikipedia.org /wiki/Cumulonimbus   (594 words)

 Cumulonimbus Clouds: reaching high into the atmosphere
Cumulonimbus clouds (Cb) are much larger and more vertically developed than fair weather cumulus.
Lower levels of cumulonimbus clouds consist mostly of water droplets while at higher elevations, where temperatures are well below 0 degrees Celsius, ice crystals dominate.
Under favorable atmospheric conditions, harmless fair weather cumulus clouds can quickly develop into large cumulonimbus clouds associated with powerful thunderstorms known as supercells.
ww2010.atmos.uiuc.edu /(Gh)/guides/mtr/cld/cldtyp/vrt/cb.rxml   (168 words)

 Cumulonimbus -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: )
The discharge of this electricity causes (A booming or crashing noise caused by air expanding along the path of a bolt of lightning) thunder and (The flash of light that accompanies an electric discharge in the atmosphere (or something resembling such a flash); can scintillate for a second or more) lightning.
However, they can also form along a (The front of an advancing mass of colder air) cold front when the warm buoyant air is forced upward by the heavier cold air mass that cuts under the warmer air like a wedge.
Cumulonimbus clouds contain severe ((meteorology) the vertical movement of heat or other properties by massive motion within the atmosphere) convection currents, with very high, unpredictable winds, particularly in the vertical plane (updrafts and (A strong downward air current) downdrafts).
www.absoluteastronomy.com /encyclopedia/c/cu/cumulonimbus.htm   (680 words)

 Australian Cloud Atlas - Cumulonimbus
This cumulonimbus is affected by strong wind shear.
Cumulonimbus with pileus cloud - pileus indicates that updrafts are very strong.
Not all large cumulonimbus are thunderstorms, this system brought very heavy rains with flash flooding, a cirrus crown is clearly visible.
ozthunder.com /photo/cb.htm   (220 words)

 Clouds that produce precipitation
Powerful cumulonimbus clouds with bright white overshooting tops that punch through the tropopause are especially easy to track on visible satellite images.
And even though the base of a cumulonimbus cloud may be as low as 3 or 4000 feet, the anvil tops spread out because they are as high as the tropopause, frequently 50 or 60,000 feet high in the summer.
Cumulonimbus clouds form in moist atmospheres and are common in spring and summer.
cimss.ssec.wisc.edu /satmet/modules/clouds/lowclouds2.html   (225 words)

 Cumulonimbus - Wikipédia
Il ressemble en général à une enclume, et l'on parle alors de cumulonimbus capillatus, par opposition au cumulonimbus calvus (étape de transition entre le cumulus congestus et la cumulonimbus capillatus).
Les cumulonimbus sont des nuages d'origine convective, membres de la classe des cumulus.
Les cumulonimbus dits de masse d'air, relativement bénins, se forment suite à la convection causée par le réchauffement solaire de l'air près du sol, en l'absence de forçages dynamiques.
fr.wikipedia.org /wiki/Cumulonimbus   (340 words)

The cloud should be called cumulonimbus as soon as at least a part of its upper portion loses the sharpness of its outlines or presents a fibrous or striated texture.
Cumulonimbus is composed of water droplets, supercooled droplets and ice crystals, snowflakes, snow pellets, ice pellets or hail stones.
Cumulonimbus may be described as a "cloud factory," and it may produce more or less thick patches or sheets of cirrus spissatus, altocumulus, altostratus or stratocumulus by the spreading out of its upper portions and by the dissipation of its subjacent parts.
www.met.tamu.edu /class/Metr304/Exer10dir/convectiveclouds.html   (580 words)

 BBC - Weather Centre - Types of Cloud - Cumulonimbus
But there is one important structural difference in that the uppermost levels of the cumulonimbus have turned to ice and become fibrous in appearance, whereas cumulus clouds are composed entirely of water droplets.
Cumulonimbus clouds may be seen at any time of the day, but are most common inland during the afternoon in spring and summer.
August 1975 was an example of a cumulonimbus cloud which managed to keep regenerating itself over one small area of London.
www.bbc.co.uk /weather/features/cumulonimbus.shtml   (334 words)

 Met Office: CL9 Cumulonimbus with anvil
If the cumulonimbus passes nearly or directly overhead, the characteristic top is lost to view.
By convention, the cloud is reported as cumulonimbus if accompanied by lightning, thunder, hail or other precipitation of a showery nature.
Cumulonimbus the upper part of which is clearly fibrous often in the shape of an anvil.
www.met-office.gov.uk /bookshelf/clouds/cl9   (289 words)

 Cumulonimbus Clouds - 01/30/98   (Site not responding. Last check: )
Cumulonimbus clouds are often referred to as thunderheads.
Not all cumulonimbus clouds generate thunder and lightning however all of them generate precipitation.
Electrification frequently occurs in cumulonimbus clouds which is responsible for thunder and lightning, a topic which will be expanded upon when we cover thunderstorms in much more detail.
www.rain.org /campinternet/meteorology/cumulonimbus.html   (60 words)

The spreading of the upper portion of a cumulonimbus cloud into an anvil-shaped plume usually of fibrous or smooth appearance.
cumulonimbus cloud, usually with gusty winds, heavy rain, and sometimes hail.
cumulonimbus cloud and associated with a very strong or severe thunderstorm.
www.movies.warnerbros.com /twister/cmp/glossary.html   (1359 words)

 Cumulonimbus on Flickr - Photo Sharing!
Three ingredients are needed for the formation of a perfect cumulonimbus cloud: 1) Plenty of moisture; 2) A mass of warm unstable air; and 3) A source of energy to lift the warm, moist air mass rapidly upward.
The base of a cumulonimbus can be several miles across, and it can be tall enough to occupy middle as well as low altitudes; though formed at an altitude of about 3,000 to 4,000 meters (10,000 to 12,000 feet), its peak can reach up to 23,000 meters (75,000 feet) in extreme cases.
Cumulonimbus clouds are also characterized by a flat, anvil-like top (the anvil dome), caused by straight line winds at the higher altitudes which shear off the top of the cloud, as well as by an inversion over the thunderstorm caused by rising temperatures above the tropopause.
www.flickr.com /photos/31945478@N00/197988431   (1264 words)

 Cumulonimbus (glossary definition)
Cumulonimbus (Cb) A principal cloud type (cloud genus) of vertical development.
Exceptionally dense and vertically developed clouds, occurring either as isolated clouds or as a line or wall of clouds with separated upper portions.
Under the base of cumulonimbus, which is very dark, there frequently exists virga, precipitation, and low, ragged clouds, either merged with it or not.
nsidc.org /arcticmet/glossary/cumulonimbus.html   (110 words)

 Houze's Cloud Atlas: Cumulonimbus
Anvil of a cumulonimbus, as seen from Cimmaron, Colorado.
If the anvil were more widespread, as from a line or group of cumulonimbus clouds, it would be classified as cirrostratus cumulonimbogenitus.
A cumulonimbus cloud near Waterville, KS, exhibits a form called mamma, which are the bulbous protuberances hanging from the lower side of the cloud.
www.atmos.washington.edu /gcg/Atlas/cb.html   (283 words)

 Cumulonimbus Clouds
This is a photograph of a cumulonimbus cloud.
Cumulonimbus clouds belong to the Clouds with Vertical Growth group.
A cumulonimbus cloud can grow up to 10km high.
www.windows.ucar.edu /tour/link=/earth/Atmosphere/clouds/cumulonimbus.html   (108 words)

 Planet Terragen : Real > Clouds > Cumulonimbus   (Site not responding. Last check: )
These pictures show clouds associated with the pass of a cold front, and represent the typical cloud activity to be observed when cumulonimbus clouds are present.
Note the incredible size and height of these clouds compared to cumulous congestus cloud; the distinctive anvil top where the cloud spreads out at the tropopause; and the clear blue sky where there are no cirrus.
Cumulonimbus clouds in their most active stage, although short-lived, are a truly amazing site to behold.
www.planetterragen.com /clouds/cumulonimbus   (110 words)

 Cloud photographs by Dave Parker (FRMetS)
A rainbow is nearly always associated with cumulonimbus as here, or occasionally with large cumulus.
Parhelia taken in a gap between several cumulonimbus clouds in Marden, Kent on 24/10/99 late afternoon.
The same Cumulonimbus cloud with a small aircraft, in my view unwisely, heading into the centre of the storm.
www.invectis.co.uk /cloud/cloud.html   (1155 words)

A cumulonimbus is a storm cloud with large vertical extend (up to 13 miles maximally, in the tropics).
The top of a cumulonimbus usually has the form of an anvil because the tropopause is a strong temperature inversion which the cloud cannot penetrate, so the cloud spreads out laterally.
Cumulonimbus is usually precipitating snow, hail, rain or graupel, and may have lightning as well.
www.weather-photography.com /Photos/gallery.php?cat=clouds&subcat=cb   (122 words)

The clouds which form are heavy cumulus or cumulonimbus.
A shower, a sudden heavy burst of precipitation, falls from a well developed cumulus or cumulonimbus cloud, which may be embedded in a stratus layer.
Hence hail is often encountered in a cumulonimbus thundercloud.
www.allstar.fiu.edu /aero/fltenv3.htm   (5148 words)

 AtmoSphere - pages/cumulonimbus.html   (Site not responding. Last check: )
Cumulonimbus clouds are very large and vertically developed into "towers." These towers can exist individually or in a line, known as "squall lines".
The top of cumulonimbus spread out as they reache the tropopause, forming a characteristic anvil shape.
The base of the cloud consists of water droplets, while the top of the cloud is made up of ice crystals due to the atmospheric temperature.
atschool.eduweb.co.uk /kingworc/departments/geography/nottingham/atmosphere/pages/cumulonimbus.html   (87 words)

 cumulonimbus   (Site not responding. Last check: )
Cumulonimbus clouds indicate significant instability in the atmosphere.
You can also tell a cloud is cumulonimbus when the top has a fuzzy fibrous appearance.
It is extremely important to monitor cumulonimbus clouds since they more often than not produce severe weather.
snrs.unl.edu /amet351/noehrenberg/cumulonimbus.html   (150 words)

 Islam Guide: The Quran on Clouds
Scientists have studied cloud types and have realized that rain clouds are formed and shaped according to definite systems and certain steps connected with certain types of wind and clouds.
One kind of rain cloud is the cumulonimbus cloud.
Meteorologists have studied how cumulonimbus clouds are formed and how they produce rain, hail, and lightning.
www.islam-guide.com /ch1-1-g.htm   (945 words)

 Cumulonimbus capillatus
A cumulonimbus capillatus cloud is massive in every measure.
Sometimes the cumulonimbus clouds are hidden in other cloud formations, normally a front system filling the sky with other clouds.
Here the top of a cumulonimbus is seen coming through a covered sky.
www.chitambo.com /clouds/cloudshtml/capillatus.html   (374 words)

 THUNDERSTORM WARNING   (Site not responding. Last check: )
A cumulonimbus cloud typically covers an area of a few kilometres in diameter with a vertical extent of ten kilometres or more, like a tower hanging in the sky.
The typical life span of a cumulonimbus cloud is a couple of hours.
They are formed in well-developed cumulonimbus clouds associated with thunderstorms, mainly in spring.
www.hko.gov.hk /wservice/warning/thunder.htm   (1306 words)

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