cloud base"For a given cloud or cloud layer, the lowest level in the atmosphere at which the air contains a perceptible quantity of cloud particles. See cloud height, ceiling.
Cloud Base- the lowest level in the atmosphere that contains cloud particles (water droplets, ice crystals, etc.) ...
Cloud base The lowest portion of a cloud.
Cloudburst Any sudden and heavy rain shower.
Cloud cover The amount of the sky obscured by clouds when observed at a particular location.
Cloud Base- For a given cloud or cloud layer, it is the lowest level in the atmosphere where cloud particles are visible.
Cloud Condensation Nuclei- small particles in the air on which water vapor condenses and forms cloud droplets.
Cloud base will be difficult, and I won't go into detail on estimation of cloud bases.The Observers Handbook (see 5A.6) is your best guide.
Fog -A cloud based at the earth's surface consisting of tiny water droplets or, under very cold conditions, ice crystals or ice fog; generally found in calm or low wind conditions.
A dark, horizontal cloud base with no visible precipitation beneath it. It typically marks the location of the thunderstorm updraft.
Clear slotA local region of clearing skies or reduced cloud cover, indicating an intrusion of drier air; often seen as a bright area with higher cloud bases on the west or southwest side of a wall cloud.
CEILING LIGHT An instrument consisting of a drum and an optical system that projects a narrow vertical beam of light onto a cloud base.
Clear SlotWith respect to severe thunderstorms, a local region of clearing skies or reduced cloud cover, indicating an intrusion of drier air; often seen as a bright area with higher cloud bases on the west or southwest side of a wall cloud.
Whether or not a tornado achieves "wedge" status depends on several factors other than intensity - in particular, the height of the environmental cloud base and the availability of moisture below cloud base.
Ceiling balloon A small balloon used to determine the height of the cloud base. The height can be computed from the ascent velocity of the balloon and the time required for its disappearance into the cloud.
ceilometerA device using a laser or other light source to determine the height of a cloud base.
ceilometer ("to determine the height of a cloud base")
celestial coordinate system
celestial equator
celestial horizon (rational horizon)
celestial navigation (astronavigation)
celestial pole
Celsius ...
SCTScatteredScudSmall, ragged, low cloud fragments that are unattached to a larger cloud base and often seen with and behind cold fronts and thunderstorm gust fronts.
Forecast sky cover (height and amount of cloud bases), cloud tops, visibility (including vertical visibility), weather, and obstructions to vision are described for a corridor 25 miles either side of the route.
Even though this cloud is lowering, it remains attached to the rain free cloud base of the thunderstorm. It is usually located south or southwest of the visible precipitation area, and marks the strongest updraft in the thunderstorm.
*Wedge (or Wedge Tornado) - [Slang], a large tornado with a condensation funnel that is at least as wide (horizontally) at the ground as it is tall (vertically) from the ground to cloud base.
Some vortices start from above, hanging from the cloud base, but are usually hard to see for all the rain. Most vortices probably begin at ground level, as perhaps a dust-devil-like whirl.
Wall Clouds a lowering in the cloud base
Researchers have shown that wall clouds probably develop when some rain-cooled air is pulled upward, along with the more buoyant air, ...
A "true" tail cloud typically is attached to the wall cloud and has a cloud base at about the same level as the wall cloud itself.
A "true" tail cloud is attached to the wall cloud and has a cloud base at about the same level as the wall cloud itself.
A local region of clearing skies or reduced cloud cover, indicating an intrusion of drier air; often seen as a bright area with higher cloud bases on the west or southwest side of a wall cloud.
In the mid-latitudes, cloud bases are usually found between 8,000 and 18,000 feet. A defining characteristic is that it often appears as a wavy billowy layer of cloud, giving it the nickname of "sheep" or "woolpack" clouds.
A device using a laser or other light source to determine the height of a cloud base.
In weather observations, the height of the cloud base above local terrain. Compare ceiling. 2. (Rare.) The height of the cloud top above local terrain or above mean sea level. 3.
A stationary cloud directly above an isolated mountain peak, with cloud base below the elevation of the peak.
NOAA National Weather Service - Cite This Source - This Definition ...
WALL CLOUD An abrupt lowering of a cloud from its parent cloud base, a cumulonimbus or supercell, with no visible precipitation underneath.
Leader - The conductive path of ionized air that forms near a cloud base prior to a lightning stroke. The initial conductive path is referred to as a step leader because it extends itself earthward in short, nearly invisible bursts.
Precipitation - Shaft A visible column of rain and/or hail falling from a cloud base. When viewed against a light background, heavy precipitation appears very dark gray, sometimes with a turquoise tinge.
CEILING - The height from the ground to the cloud base. Commonly used in the aviation community.
CELSIUS - A metric unit of a degree for measurement of temperature, based on the boiling point of water of 100 degrees (Celsius). Also called CENTIGRADE.
Funnel cloud A tornadic circulation extending below cloud base but not reaching the ground; made visible by a cone-shaped cloud.
G
Gamma radiation Electromagnetic radiation having very short wavelength and great penetrating power.
CEILING- The height of the cloud base closest to the earth's surface.
CELL- An individual thunderstorm (often referred to as such on radar).
cloud detection radar—A vertically directed radar to detect cloud bases and tops.
cold front—Any non-occluded front which moves in such a way that colder air replaces warmer air.
condensation—See change of state.
An automatic, recording, cloud-height indicator. A light beam is projected upward on to the cloud base; the reflected light is detected by a photocell and the height is determined by triangulation.
cup anemometer ...
funnel cloud: a quickly rotating column of air coming down from a cloud base but not reaching the ground. When it touches the ground it becomes a tornado.
The ceiling projector shines a narrow beam of light up to the cloud base.
Sometimes raindrops evaporate as they fall towards the ground and appear as thin streamers coming from the cloud base - this is called 'virga'.
 See also: Cloud, Air, Clouds, Surface, Temperature
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