Clear sky Sky with a total cloud cover of less than one okta (or one-tenth in the United States).
Clear-Air Turbulence (often abbreviated CAT and sometimes colloquially referred to as "air pockets") is the erratic movement of air masses in the absence of any visual cues (such as clouds).
clear-air echo"A radar echo returned from a region of the atmosphere with no apparent meteorological scatterers such as clouds or precipitation. Clear-air echoes are caused by either 1) solid target returns from birds, insects, dust, ...
Clear Slot - 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.
Clear-air Mode - a highly sensitive operational mode of a WSR-88D radar in which the antenna scans slowly, obtaining only 5 elevation slices in 10 minutes. This slow scan speed allows the radar to sense echoes from "clear-air" (i.e.
CLEAR: Sky condition of less than 1/10 cloud coverage.
CLIMATE: The historical record of average daily and seasonal weather events.
CLOSED LOW: See Cutoff Low below.
clear - 1. After U.S. weather observing practice, the state of the sky when it is cloudless or when the sky cover is less than 0.1 (to the nearest tenth.) In aviation weather observations, a clear sky state is denoted by the symbol "O." 2.
Clear- the appearance of the sky when it is without clouds, or less than 1/10th of the sky is covered by clouds.
Climatology- the scientific study of climate.
Clearing
(Clearance) (1) Decrease of total cloud amount from an initial cloudy state. (2) Time in which this decrease takes place. (3) Gap in cloud layer covering the entire sky.
Clear Sky
Sky with a total cloud cover of less than one okta.
CLEAR AIR TURBULENCE Name given to turbulence that may occur in perfectly clear air without any visual in warning in the form of clouds.
Clear Ice It is a glossy, clear or translucent ice formed by the relatively slow freezing of large supercooled droplets. The large droplets spread out over the airfoil of an airplane before complete freezing, forming a sheet of clear ice.
clear icing (or clear ice)—Generally, the formation of a layer or mass of ice which is relatively transparent because of its homogeneous structure and small number and size of air spaces; used commonly as synonymous with glaze, ...
Clear ice A layer of ice that appears transparent because of its homogeneous structure and small number and size of air pockets.
Climate The accumulation of daily and seasonal weather events over a long period of time.
Clear Slot
With 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.
Clear- Sky condition of less than 1/10 cloud coverage.
Clear Slot- A local region of clearing skies or reduced cloud cover, indicating an intrusion of drier air; ...
Clear, Scattered, Broken, and Overcast These are the common terms used in aviation meteorology to refer to sky conditions. They are based on the percentage of sky obscured by clouds. The list below shows the criteria used:
CLEAR ...
Mostly Clear: When the predominant/average sky condition is covered 1/8 to 2/8 with opaque (not transparent) clouds. Called Mostly Sunny if it is during the day.
Clear: Free from cloud, fog, mist or dust haze.
Sunny: Little chance of the sun being obscured by cloud.
clearing with scattered Sc; occasionally Cb in summer
Precipitation
light-to-moderate rain, snow, sleet, or drizzle
drizzle or none ...
CLEAR: Sky condition with less than 1/10 cloud coverage.
CLIMATE: The statistical collective of weather records during a specified period of time.
Clear Sky - When the sky has no clouds.
Climate - It describes the average weather conditions in a certain place or during a certain season. Weather may change from day to day, but climate changes only over hundreds or thousands of years.
Clear air mode is the normal mode of operation and is used when there is no significant precipitation in the area. In this mode the radar is VERY sensitive and will detect even minute echoes.
CLEARING TURNS - Two turns of 90 degrees each, which are performed in order to look for other air traffic before any flight maneuvers involving unusual attitudes are performed.
CLEAR AIR MODE - Weather radar mode operating with higher gain for reflected signal. Often a radar operating in this mode displays information on its screen, which is actually smoke, dust, even birds and insects.
Clear: Sky cloud-free to 30 percent covered.
Sunny: Sunshine 70-100 percent of the day.
Partly sunny and partly cloudy: Both terms refer to 40 to 70 percent cloud cover. Partly sunny is used in the day; partly cloudy is used at night.
3. Clear circle are the station locations, such as Buffalo, New York.
4. Looking at Buffalo, New York -49 in the upper left is the temperature of -49 degrees Celsius at the 300 mb level.
It is clear that the wind velocity is low at the surface, and increases with height. Therefore, the "surface wind" is not well-determined and depends on the details of measurement.
What is not clear, and has not been satisfactorily proven (or indeed disproved), is whether there is any season-by-season link between the ENSO variations (warm-normal-cold), and regional climates well away from the Pacific/Equatorial region, ...
Eye: The clear area of lowest pressure at the center of a strong tropical cyclone.
Eye wall: The circular region of strong thunderstorms immediately surrounding the eye.
Exosphere: The uppermost layer of the Earth's outer atmosphere.
Mostly ClearWhen the 1/8th to 2/8ths of the sky is covered by with opaque (not transparent) clouds. Sometimes referred to as Mostly Sunny if this condition is present during daylight hours.
Occurs on calm, clear nights when a moist layer at the surface is cooled to its dew point.
Radiational cooling
The cooling of the earth?s surface and the adjacent air due to outgoing radiation.
GLAZE A smooth clear icy coating of supercooled water droplets that spread out and freeze onto objects on contact. A storm that produces the accretion of glaze is called an ice storm. Related term: clear ice ...
ClearSky condition of less than 1/10 cloud coverage. In the United Kingdom, clear is defined as âNo cloudâ, and in Australia, it is defined as âVirtually cloud-freeâ.
This is more pronounced when you have a clear sky.Radiational InversionUsed interchangably with Nocturnal Inversion; a temperature inversion that develops during the night as a result of radiational cooling of the surface.
nuclear accident, toxic chemical spill, etcCenterGenerally speaking, the vertical axis of a tropical cyclone, usually defined by the location of minimum wind or minimum pressure. The cyclone center position can vary with altitude.
CLEAR The state of the sky when no clouds or obscurations are observed or detected from the point of observation. CLEAR AIR TURBULENCE Name given to turbulence that may occur in perfectly clear air without any visual in warning in the form of clouds.
0 indicates a clear sky and 1.0 (or 10/10) indicates a completely covered sky. The following classifications are used in aviation weather observations: clear, scattered, broken, overcast, partial obscuration, obscuration.
Windy or cloudy conditions will tend to produce slow temperature recovery, while clear, calm weather can cause rapid recovery.
Clear Air Mode uses VCP 31 and 32. Each has a Volume Scan consisting of 5 elevation angles (0.5 to 4.5 degrees) in ten minutes.
clear cutting A forest-management technique that involves harvesting all the trees in one area at one time.
The Horse Latitudes is the name of the belt of calms, light winds and fine, clear weather between the trade wind belts and the prevailing westerly winds of higher latitudes.
The ideal conditions for dew are a still, clear night, high humidity in the air next to the ground, and low humidity in the air above.
DIRTY HIGH- High pressure usually brings clear weather. A high pressure is termed "dirty" if it has a canopy of clouds associated with it.
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A cloud-like stream formed in cold, clear air behind the engines of an aeroplane.
Convection
The transfer and mixing of heat by movement, normally in the vertical.
Freezing rain - rain that freezes after it hits the ground or other object and forms clear ice.
Fronts - baroclinic divisions in the atmosphere. Zones between air masses where temperature changes quite rapidly with horizontal distance.
Weather - State of the atmosphere with respect to heat or cold, wetness or dryness, calm or storm, clearness or cloudiness. Also, weather is the meteorological day-to-day variations of the atmosphere and their effects on life and human activity.
Dry adiabatic lapse rate Rising unsaturated (clear) air parcels cool at the rate of about 10 Celsius degrees per 1000 m of uplift (or 5.5 Fahrenheit degrees per 1000 ft).
An unseasonably warm spell with clear skies near the middle of autumn. Usually follows a substantial period of cool weather.
Infrared radiation(4) ...
Contrail - A cloud-like streamer frequently observed behind aircraft flying in clear, cold, and humid air and caused by the addition to the atmosphere of water vapor from engine exhaust gases.
Indian summer An unseasonably warm spell with clear skies near the middle of autumn. Usually follows a substantial period of cool weather.
Contrail- A cloud-like stream formed in cold, clear air behind the engines of an airplane.
Radiation Fog: Fog formed over land at nights characterized by light winds, clear sky and moist air in the low levels of the atmosphere.
Ice Fog - Fog composed of ice crystals instead of water droplets. Ice fog forms when clear and calm conditions prevail in extremely cold arctic air.
Okta: meaning eighth, is the form used to report coverage of the sky in cloud. Eight Oktas is full coverage with Zero Oktas being a clear sky.
Orographic waves: a wavelike airflow produced over and in the lee of a mountain barrier.
Eye: The low pressure center of a tropical cyclone. Winds are normally calm and sometimes the sky clears. ...
Indian summer: occurring during mid to late autumn after the first frost, a period of unusually warm weather with clear skies and cool nights.
One well known characteristic of a hurricane is it's eye, which is generally about 5 to 25 miles in diameter and in which are present calm conditions, with clear skies and light winds.
Radiational Cooling - The cooling of the lower atmosphere during the nighttime hours. This, in combination with light surface winds and relatively clear skies, will often set the stage for fog.
The essential attribute of the CCM is a specialized knowledge of the field, combined with broad experience, an integrated concept of service, and a clear and unwavering adherence to the rules of professional conduct and service.
 See also: Air, Weather, Temperature, Cloud, Water
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