Air Masses scaffolding activity
Introduction:
An air mass is a large body of air with similar temperature and moisture properties throughout.
Air-mass Thunderstorm - Generally, a thunderstorm not associated with a front or other type of synoptic-scale forcing mechanism.
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 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 Mass Large body of air, often hundreds or thousands of miles across, containing air of a similar temperature and humidity.
Air pressure is measured in hectopascals. On this weather map the isobars are at 4 hectopascal intervals.
The black arrows show the wind direction. High and low pressure regions do not stay in the same place. They move over the Earth's surface.
* * Upper Air Thickness & Lifting Index Charts * *
Choose the chart you want to view.
1000 - 500 mb thickness
Lifting Index United States.
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.
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, ...
air mass classification—A system used to identify and to characterize the different air masses according to a basic scheme.
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- 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 Pressure - Force that air exerts over a certain area due to it's weight or motion.
Amu - atomic mass unit, the unit used to measure the masses of subatomic particles; a proton has a mass of 1 amu.
AIR MASS THUNDERSTORM
A thunderstorm that is produced by convection within an unstable air mass through an instability mechanism.
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 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 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 pressure
The weight of the air in the atmosphere pressing down on the Earth
Anemometer ...
AIR DENSITY: The mass density of a parcel of air expressed in units of mass per volume.
Air Quality Alert - Issued during times (usually on hot, summer days) when ground-level ozone and/or fine particle concentrations unexpectedly reach, or are approaching, unhealthy levels in your area based on monitored values.
Air pressure tendency Change in air pressure with time; on a surface weather map, the air pressure change over the prior 3 hours.
Albedo The fraction or percent of radiation striking a surface that is reflected by that surface.
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 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 localized thunderstorm that forms in a warm, moist, unstable air mass. Most frequent in the afternoon in spring and summer.
Air pollutants Solid, liquid, or gaseous airborne substances that occur in concentrations high enough to threaten the health of people and animals, to harm vegetation and structures, or to toxify a given environment.
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 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, ...
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.
COLD AIR FUNNEL Funnel clouds, usually short-lived, that develop from relatively small showers or thunderstorms when the air aloft is very in cold.
Cold Air Advection Transport of cold air into a region by horizontal winds.
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.
Cold Air Dam
A shallow cold air mass which is carried up the slope of a mountain barrier, but with insufficient strength to surmount the barrier.
UPPER AIR/UPPER LEVEL
The portion of the atmosphere which is above the lower troposphere. It is generally applied to the levels above 850 millibars.
Stable Air - Air that is colder than its surroundings and as such is resistant to upward movement.
Trough - An elongated area of low pressure.
Air Toxic
A generic term referring to a harmful chemical or group of chemicals in the air.
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 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 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 pressure- A force that is the result of the weight of a column of air pushing down on an area.
Altitude- Elevation above sea level.
Anemometer- An instrument used to measure wind speed.
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 in motion relative to the earth's surface, caused by the average movement of a "large number" of molecules of air, usually with scales larger than the random motions of individual molecules; ...
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 widespread body of air with consistent temperature and moisture characteristics.
Air mass
A large volume of air with uniform properties of temperature and moisture.
Anabatic wind ...
Air that flows toward higher terrain, and hence is forced to rise. The added lift often results in widespread low cloudiness and stratiform precipitation if the air is stable, or an increased chance of thunderstorm development if the air is unstable.
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.
An air pollution transport and diffusion model developed to determine pesticide drift from aerial spraying operations in valleys.
NOAA National Weather Service - Cite This Source - This Definition ...
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.
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.
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.
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.
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.
Cause: Moist air moving into cold environment, or cold air moving into moist environment.
Associated Weather: Drizzle or light snow.
Hazard Warning: Restricted visibility.
 See also: Surface, Temperature, Weather, Water, Cloud
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