Anvil - The flat, spreading top of a Cb (cumulonimbus), often shaped like an anvil. Thunderstorm anvils may spread hundreds of miles downwind from the thunderstorm itself, and sometimes may spread upwind
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Anvil - The spreading of the upper portion of a cumulonimbus cloud into an anvil-shaped plume usually of fibrous or smooth appearance.
Anvil Crawler - [Slang], a lightning discharge occurring within the anvil of a thunderstorm, characterized by one or more channels that appear to crawl along the underside of the anvil.
anvil cloud"The anvil-shaped cloud that comprises the upper portion of mature cumulonimbus clouds; the popular name given to a cumulonimbus capillatus cloud, particularly if it embodies the supplementary feature incus (from the Latin for anvil).
Anvil Rollover - [Slang], a circular or semicircular lip of clouds along the underside of the upwind part of a back-sheared anvil, indicating rapid expansion of the anvil.
Anvil Cloud: The upper flattened portion of a cumulonimbus cloud that spreads out when it meets the tropopause.
Aphelion: The location in the orbit when Earth (or any other planet) is farthest away from the Sun.
anvil: the top part of a cumulonimbus cloud that is flat and spread out, with a shape that looks like a blacksmith's anvil.
Anvil Cloud
A Cirriform cloud, with an anvil shape, which forms the upper part of a well-developed Cumulonimbus. Its glaciated top spreads out horizontally upon reaching the tropopause or by the action of the winds aloft.
Anvil (Anvil Cloud) - a supplementary cloud feature viewed as the spreading of the upper portion of a cumulonimbus cloud; thunderstorm anvils may spread hundreds of miles downwind from the storm's updraft ...
anvil cloud—Popular name given to the top portion of a cumulonimbus cloud having an anvil-like form.
APOB—A sounding made by an aircraft.
Orphan Anvil - [Slang], an anvil from a dissipated thunderstorm, below which no other clouds remain.
ORPHAN ANVIL
An anvil from a dissipated thunderstorm, below which no other clouds remain.
ANVIL - The top of a towering cumulonimbus (thunderstorm) cloud reaching the equilibrium altitude where the air ceases vertical motion and flattens out in a formation very similar to a black smith's anvil. A spreading anvil is also called a CROWN.
What is the Anvil Rule for Thunderstorms?
NASA launch protocols include data on weather and events within the atmosphere. Learn how anvil clouds form and why they are dangerous to the launch of a space shuttle.
Cumuliform Anvil - A thunderstorm anvil with visual characteristics resembling cumulus-type clouds (rather than the more typical fibrous appearance associated with cirrus).
Back-Sheared Anvil Slang for a thunderstorm anvil which spreads upwind, against the flow aloft. A back-sheared anvil often implies a very strong updraft and a high severe weather potential.
Hard, cumuliform anvil overhang, a vertical Cb edge, and flanking line are all visible in this southeastward view of a supercell storm. Mammatus can be seen on the underside of the north Texas supercell.
Congestus (or Cumulus congestus)A large cumulus cloud with great vertical development, usually with a cauliflower-like appearance, but lacking the characteristic anvil shaped top of a Cb (Cumulonimbus cloud).
Thunderstorm anvils are a form of cirrus cloud, but most cirrus clouds are not associated with thunderstorms.CIGCeiling- The height of the lowest layer of clouds, when the sky is broken or overcast.CINConvective INhibition.
In the mid-latitudes, cloud bases are usually found between 20,000 to 30,000 feet, and it is the highest cloud that forms in the sky, except for the tops, or anvils, of cumulonimbus, which occasionally build to excessive heights.
Penetrating TopSame as Overshooting Top; a dome-like protrusion above a thunderstorm anvil, representing a very strong updraft and hence a higher potential for severe weather with that storm.
Anvil Cloud: A cloud which forms at the top of a thunderstorm and is flattened out buy the wind and resembles an anvil.
AO1 Weather Station: AO1 is an automated station without a precipitation sensor.
Four Basic Thunderstorm Types Thunderstorms occur in a variety of forms, sometimes as an isolated cumulonimbus cloud (anvil shaped), sometimes as a cluster of clouds, sometimes as a squall line, ...
Slang for lumpy protrusions on the edges, and sometimes the underside, of a thunderstorm anvil. They usually appear on the upwind side of a back-sheared anvil, and indicate rapid expansion of the anvil due to the presence of a very strong updraft.
*Overshooting Top (or Penetrating Top) - A dome-like protrusion above a thunderstorm anvil, representing a very strong updraft and hence a higher potential for severe weather with that storm.
[Slang], a thunderstorm anvil which spreads upwind, against the flow aloft. A back-sheared anvil often implies a very strong updraft and a high severe weather potential.
A fire started to stop an advancing fire by creating a burned area in its path.
[Slang] A thunderstorm with a well-defined anvil rollover, and thus having a visual appearance resembling a mushroom.
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The cold cloud tops and anvil form a V-shape. Think of how smoke fans out downwind from a chimney. The process is similar in a strong to severe storms.
CUMULONIMBUS A vertically developed cumulus cloud, often capped by an anvil-shaped cirriform cloud.
CUMULONIMBUS CLOUD (Cb): A vertically developed cloud, often capped by an anvil shaped cloud. Also called a thunderstorm cloud, it is frequently accompanied by heavy showers, lightning, thunder, and sometimes hail or gusty winds.
This "dome" feature appears above the anvil of the storm. It is a result of the powerful updraft.
Precipitation-free base ...
Cumulonimbus
An exceptionally dense and vertically developed cloud, often with a top in the shape of an anvil. The cloud is frequently accompanied by heavy showers, lightning, thunder, and sometimes hail. It is also known as a thunderstorm cloud.
Mamma - Pouch-like clouds, usually found beneath the anvil of a thunderstorm.
Meridional - In the north-south direction; along a meridian.
Cumulonimbus
Low level, very large cauliflower-shaped or anvil-shaped tops. Thunderstorms, lightning, rain and tornadoes.
Thunderheads: A popular term referring to the anvil top of cumulonimbus clouds.
Mammatus clouds Clouds that form on the underside of a thunderstorm anvil and exhibit pouchlike, downward protuberances; may indicate turbulent air.
CUMULONIMBUS: A principal cloud type, dense and vertically developed, which produces heavy precipitation. It features an anvil shape on top and a dark base.
This part often spreads out in the form of anvil (incus) or vast plume. Under the base of cumulonimbus, which is very dark, there frequently exists virga, precipitation, and low, ragged clouds, either merged with it or not.
This supplementary cloud feature occurs mostly with cirrus, cirrocumulus, altocumulus, altostratus, stratocumulus, and cumulonimbus; in the case of cumulonimbus, mamma generally appear on the underside of the anvil (incus). See cloud classification.
Enhanced VA pattern seen on satellite infrared photographs of thunderstorms, in which a thunderstorm anvil exhibits a V-shaped region of colder cloud tops extending downwind from the thunderstorm core.
 See also: Cloud, Storm, Clouds, Thunder, Thunderstorm
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