Air

Air masses are classified according to their temperature and moisture content. The terms Arctic, Polar, and Tropical define the temperature of an air mass with arctic being the coldest and tropical being the warmest.

Air Masses scaffolding activity Introduction: An air mass is a large body of air with similar temperature and moisture properties throughout.

Air temperature (Also termed surface temperature in meteorology). The ambient temperature indicated by a thermometer exposed to the air but sheltered from direct solar radiation.

Air Mass Large body of air, often hundreds or thousands of miles across, containing air of a similar temperature and humidity.

* * Upper Air Thickness & Lifting Index Charts * * Choose the chart you want to view. 1000 - 500 mb thickness ...

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.

air-earth conduction current"(Also called fair-weather current.) That part of the air-earth current contributed by the electrical conduction of the atmosphere itself. It is represented as a downward current in storm-free regions all over the world.

Air is forced to flow against and over a mountain range in a short period of time. The air cools as it rises up the mountain range, cloud forms and rain or snow falls.

Air Mass A large body of air with nearly uniform temperature and moisture content. There are six recognised airmasses that affect the British Isles denoted by their source region and then subsequent track.

air pressure (or barometric pressure A measure of the weight of an entire air column of unit area cross section above the barometer, as a consequence of gravitational attraction, or equivalently, ...

air - Mixture of gases forming the earth's atmosphere, consisting of nitrogen (~78 percent), oxygen (~21 percent), water vapor, and other trace gases such as carbon dioxide, helium, argon, ozone, or various pollutants.

Air - the mixture of gases that surrounds the earth Air Mass - a body of air that extends hundreds or thousands of kilometers horizontally and is relatively uniform in temperature and moisture content (see continental arctic, continental polar, ...

Air Mass: Body of air where the horizontal differences in temperature and moisture are relatively small. It normally has the horizontal dimension of hundreds of miles.

air mass classification—A system used to identify and to characterize the different air masses according to a basic scheme.

Air Mass A body of air that extends hundreds or thousands of kilometers horizontally and is relatively uniform in temperature and moisture content (see continental arctic, continental polar, continental tropical, maritime polar, ...

Air mass: A large body of air that has similar weather characteristics, particularly temperature and humidity. Air pollution: Contaminants present in the atmosphere such as dust, gases or smoke.

air mass: a large body of air all of similar temperature and humidity. air pressure: barometric pressure; weight of the atmosphere at a particular point of interest.

Air: The mixture of gases that make up the earth's atmosphere. The principal gases that compose dry air are: Nitrogen (N2) 78.09%; Oxygen (O2) 20.946%; Argon (A) at 0.93%; and Carbon Dioxide (CO2) 0.033%.

Air: A naturally occurring mixture of gases, chiefly nitrogen and oxygen with small amounts of argon, carbon dioxide, and water vapour. Air also usually contains dust and pollen. Air Mass: ...

Air- the mixture of gases that make-up the earth's atmosphere. Air Mass- a large body of air that has similar temperature and moisture characteristics. Albedo- the reflectiveness of a surface given as either a percentage or a decimal.

AIR TRAFFIC CONTROL (ATC) - A service provided by the FAA which helps promote the safe operation and orderly flow of air traffic. ALTIMETER - An instrument which indicates your flight altitude by sensing air pressure changes and displaying it in feet.

AIR MASS An air mass is a large, horizontal body of air with a uniform distribution of moisture and temperature throughout. ARCTIC SEA-SMOKE ...

AIR MASS THUNDERSTORM A thunderstorm that is produced by convection within an unstable air mass through an instability mechanism.

Air mass: a body of air covering a relatively wide area and exhibiting horizontally uniform properties. Air pollutant: harmful substance or product introduced into the atmosphere.

Air Density Mass of air per unit volume. Air Mass An extensive body of the atmosphere whose physical properties, particularly temperature and humidity, exhibit only small and continuous differences in the horizontal.

Air Pressure - or atmospheric pressure. air pressure is the force exerted on a surface by the weight of the air above it. The internationally recognized unit for measuring this pressure is the kilopascal.

Air mass thunderstorm - a garden variety storm which causes little if any damage. It occurs a considerable distance from any front. Air pollutant - anthropogenic or otherwise unusual substance in the air. Usually harmful.

AIR MASS: A large body of air having similar horizontal temperature and moisture characteristics. ALBEDO: The percntage of light reflected by an object. ALTOCUMULUS: Mid-altitude clouds with a cumuliform shape.

Air - The mixture of gases, which form the atmosphere of the Earth. Air Pollution - Chemicals or substances in the atmosphere that are directly or indirectly harmful to living things.

Air mass A large volume of air with uniform properties of temperature and moisture. Anabatic wind ...

AIR DENSITY: The mass density of a parcel of air expressed in units of mass per volume.

air mass: a body of air that has the same temperature, moisture, and stability properties. altimeter: an instrument that measures the altitude of something with respect to a set level.

Air-mass Thunderstorm- Generally, a thunderstorm not associated with a front or other type of synoptic-scale forcing mechanism.

Air Mass - A large body of air, usually 1600 diameters or more across, that is characterized by homogeneous physical properties at any given altitude.

Air mass thunderstorm- A thunderstorm that is created through rising air, without the help of a frontal boundary. These storms are typical during hot summer days in the afternoons and early evenings.

Air pressure The cumulative force exerted on any surface by the molecules composing air. Albedo The percent of radiation returning from a surface compared to that which strikes it.

Air mass Thunderstorm - A thunderstorm not associated with a front. Air mass thunderstorms typically are associated with warm, humid air in the summer months; they develop during the afternoon in response to afternoon heating by the sun, ...

air is stable if it is at the same density as surrounding air, so it will not tend to rise or fall but will tend to remain in place ...

Air that flows outward from a thunderstorm. Outflow Boundary A storm-scale or mesoscale boundary separating thunderstorm-cooled air (outflow) from the surrounding air; similar in effect to a cold front, ...

AIR - A mixture of gases that makes up most of the atmosphere around the earth. It is roughly 78% nitrogen, 21% oxygen, and 1% argon and other trace gases. ALOFT - Above the ground in the atmosphere.

Air Mass - A widespread body of air, the thermal, moisture, and stability properties of which can be identified as(a) having been established while that air was situated over a particular region of the earth's surface (climatology), ...

Cold air moves over a body of water such as the Great Lakes. Moisture and warmth as picked up from the warmer bodies of water. (Remember, the Great Lakes don't freeze!) That air is now warmer and therefore rises in the atmosphere.

Warm Air Advection Transport of warm air into an area by horizontal winds. Low-level warm advection sometimes is referred to (erroneously) as overrunning.

Cold-air Funnel - A funnel cloud or (rarely) a small, relatively weak tornado that can develop from a small shower or thunderstorm when the air aloft is unusually cold (hence the name). They are much less violent than other types of tornadoes.

Air that flows in relation to the earth's surface, generally horizontally. There are four areas of wind that are measured: direction, speed, character (gusts and squalls), and shifts.

WIND Air that flows in relation to the earth's surface, generally horizontally. There are four areas of wind that are measured: direction, speed, character (gusts and squalls), and shifts.

Cold Air Funnels Cold air funnels are not uncommon in Minnesota, especially in the spring. They are always quite small in scale, short-lived, and hardly ever touch the ground.

Cool air can flow down the slopes of a branched valley system like the water in the stream that made the valley. The flow can even reverse during the day, and the warm air flows upstream.

The 'air-mass' zero degree level is relatively straightforward to forecast.

W0040 Air chaud Particule d'air dont la température est élevée en elle-même, ou plus élevée que celle de la surface sous-jacente, ou des particules d'air environnant. W0050 Warm anticyclone (W0090) ...

Polar Air- A mass of very cold, very dry air that forms in polar regions. Precipitation- Any liquid or solid form of water that falls from the atmosphere and reaches the surface of the Earth.

Polar air mass(6) A cold air mass that forms in a high-latitude source region. Polar climates(6) ...

Stable Air - Air that is colder than its surroundings and as such is resistant to upward movement. Trough - An elongated area of low pressure.

Unstable Air - Air that is able to rise easily, and has the potential to produce clouds, rain, and thunderstorms.

CAA- Cold Air Advection, The movement of colder air horizontally toward a fixed point on the earth's surface. CAP- Temperature inversion which prevents convection from occurring.

WAAWarm Air Advection - the advection (movement) of warm air into a region. WakeThe region of turbulence immediately to the rear of a solid body caused by the flow of air over or around the body.

eddy Swirling air currents that varies from the main air current. effective emissivity A correction factor, dependent on the radiational characteristics of the earth-atmosphere system, ...

Updraft Warm moist air which rises and condenses into a visible cumulus or cumulonimbus cloud. Once the cloud forms, it depends on the updraft for continuance and further development.

Radiation FogA fog that forms when outgoing longwave radiation cools the near-surface air below its dew point temperature.

Channeled High WindsIn mountainous areas or in cities with tall buildings, air may be channeled through constricted passages producing high winds.

See also: Surface, Temperature, Weather, Water, Atmosphere