altitude: the vertical distance above a certain level, usually sea level or ground level.
altocumulus: a middle cloud type that is white and/or gray in color and occurs as a layer or patch with a waved aspect. Generally have shadowed parts.
Altitude- Height expressed as the distance above a reference point, which is normally sea level or ground level.
Altocumulus- Mid-altitude clouds with a cumuliform shape.
Altostratus- Mid-altitude clouds with a flat sheet-like shape.
altitude—Height expressed in units of distance above a reference plane, usually above mean sea level or above ground.
Altitude (of the Sun) - The angle of the Sun above the horizon (sun angle).
ALTITUDE
In meteorology, the measure of a height of an airborne object in respect to a constant pressure surface or above mean sea level.
Altitude Height above the Earth's surface.
AM See amplitude modulation.
radar altitude"The altitude of an aircraft as determined by radar-type radio altimeter; thus, the actual distance from the nearest terrain feature.
Solar altitude The angle of the sun 90 degrees or less above the horizon.
DENSITY ALTITUDE
The altitude at which a given density is found in the standard atmosphere. Used in aviation, it is computed from the station pressure at takeoff and the virtual temperature at the particular altitude under consideration.
Altitude
As the air pressure will be reduced at altitudes above sea level (and increased below sea level) the actual reading of the instrument will be dependent upon its location.
Altitude- Elevation above sea level.
Anemometer- An instrument used to measure wind speed.
ALTITUDE - Height above the surface of the earth or elevation. Can be measured as AGL or MSL. If pressure units are used, it is called PRESSURE ALTITUDE, for example, the 500 MB level (18,500 feet above MSL).
The altitude of a layer in the atmosphere. It is used to define isobaric surfaces on upper level charts.
Geostrophic wind ...
The altitude which ice crystals and snowflakes melt as they descend through the atmosphere.
Melting Point
The temperature at which a solid substance undergoes fusion, changing from a solid to a liquid state. Contrast with freezing point.
High altitude ice clouds with a very thin wispy appearance.
Cirrocumulus ...
High altitude SIGWX charts are valid at specific fixed times: 0000, 0600, 1200, and 1800 UTC. They show significant en-route weather phenomena over a range of flight levels from 250 to 600, and associated surface weather features.
11.10
*Altitude (Feet)* *Millibars* *Pressure in Inches*
**Part I of III**
Standrad Atmosphere Continued ...
Maximum altitude of a rocket above a reference plane, typically mean sea level.
azimuth or azimuth angle ...
DENSITY ALTITUDE - The apparent altitude at which you are flying due to pressure, humidity, and temperature effects.
DEWPOINT - The temperature to which are must be cooled in order for it to be saturated.
nominal altitude (ft to nearest 1000 ft; metres to nearest 100 m
100
53 000 ft/16 200 m ...
height - See altitude, elevation.
helm - See helm wind.
HF - Abbreviation for high frequency. See radio frequency band.
CIRRIFORM: High altitude ice clouds with a very thin wispy appearance.
CIRROCUMULUS: Cirrus clouds with vertical development.
CIRROSTRATUS: Cirrus clouds with a flat sheetlike appearance.
Freezing levelThe altitude in the atmosphere where the temperature drops to 32F. Freezing rainRain that freezes on objects such as trees, cars and roads, forming a coating or glaze of ice.
The cyclone center position can vary with altitude. In advisory products, refers to the center position at the surface.Centimeter BurstA solar radio burst in the centimeter wavelength range.
Scintillometer A type of photoelectric photometer used to measure high-altitude winds on the assumption that stellar scintillation is caused by atmospheric inhomogeneities being carried along by wind near the tropopause level.
STJSubtropical Jet - this jet stream is usually found between 20° and 30° latitude at altitudes between 12 and 14 km.
DDustD RegionIn solar-terrestrial terms, a daytime layer of the earth's ionosphere approximately 50 to 90 km in altitude.
It is a region of steadily increasing temperature with altitude, and includes all of the exosphere and most, if not all, of the ionosphere.
At the higher altitudes, they may also have some ice crystals, but they are composed mainly of water droplets. Altocumulus, altostratus, and nimbostratus are the main types of middle clouds. This altitude applies to the temperate zone.
Pressure AltimeterAn aneroid barometer calibrated to indicate altitude in feet instead of units of pressure. It is read accurately only in a standard atmosphere and when the correct altimeter setting is used.
AnthelionA luminous white spot that appears on the parhelic circle at the same altitude as the sun and 180 degrees from it in azimuth. Anthropogenic SourceA pollutant source caused or produced by humans.
These clouds are of high altitude (20,000-40,000 feet or 6000-12,000 meters).cirrostratusA cloud belonging to a class characterized by a composition of ice crystals and often by the production of halo phenomena.
Inversion(abbrev. INVRN) Generally, a departure from the usual increase or decrease in an atmospheric property with altitude. Specifically it almost always refers to a temperature inversion, i.e.
lapse rate The rapidity with which temperature decreases with altitude. The normal lapse rate is defined to be 3.6 degrees F per 1000 feet change in altitude. The dry adiabatic lapse rate is about 5.
Jet Stream(abbrev. JSTR) Relatively strong winds concentrated in a narrow stream in the atmosphere, normally referring to horizontal, high-altitude winds. The position and orientation of jet streams vary from day to day.
At above 2 km altitude, the wind appears to be undisturbed by the surface, and turbulence is slight. Empirical formulas have been given for the variation of velocity with height, such as v = khα with α = 1/5 or 1/4.
Freezing level This is a term used in meteorology to refer to the lowest altitude in the atmosphere over a given location at which the air temperature is 32 degrees F (0 degrees C). In other words, the height of the 32 degree temperature surface.
What happens to them as the altitude changes?
How does the roughness of the terrain affect the surface wind?
What are the differences between the northern and southern hemisphere in the example?
Click the Wind Profile button.
Changes in altitude and/or attitude occur but the aircraft remains in positive control at all times. It usually causes variations in indicated airspeed, or
Turbulence that is similar to Light Chop but of greater intensity.
It is represented on a synoptic chart by a system of isobars at a specified altitude level (or a system of contours at a specified pressure level) which enclose relatively low values of pressure (or altitude).
Altimeter/Barometer Features include altitude measurement from -1500' to 21,000', memory for maximum and minimum height, accumulative vertical ascent/descent, altitude history bar graph for the past 12 hours, weather forecast, alarm clock, ...
Clouds can be categorized into two general groups: cumulus clouds (tall, cotton ball) and stratus clouds (layered); these can be divided even further to 4 sub-groups describing altitude: 20, ...
cirrostratus (high altitude flat, layerd cloud)
a large halo closely circles the sun or moon shining through cirrostratus
cirrocumulus (high altitude puffy clouds) ...
Altocumulus - Alto (medium altitude, 8000 to 24000 feet or 2400 to 6100 m) + cumulus (piles). Balls or rolls of cloud at medium height.
Altostratus - Alto + stratus (layers). Sheets of uniform gray cloud at medium altitude.
Jet Stream-A river of fast flowing air at high altitudes above the earth that generally flows from west to east over the mid-latitudes.
ALTOSTRATUS (AS): Mid-altitude clouds with a flat sheet-like shape.
ANEMOMETER: An instrument that measures wind speed.
ANTICYCLONE: A large area of high pressure around which the winds blow clockwise in the Northern Hemisphere.
ALTOCUMULUS: A principal cloud type, white and/or gray in color, present in the mid-altitudes with a cumuliform-like shape.
ALTOSTRATUS: A principal cloud type, gray or bluish in color, present in the mid-altitudes with a sheet or fibrous appearance.
Freezing Level- the altitude in the atmosphere at which the temperature drops to thirty-two degrees Fahrenheit.
Freezing Rain or Drizzle- is precipitation that falls in liquid form but freezes upon contact with cold objects.
Cloud Height- the altitude of the cloud base above the local terrain or the difference in height between the cloud top and the cloud base; (sometimes called "thickness" or "depth" of the cloud) ...
Altimeter An instrument that indicates the altitude of an object above a fixed level. Pressure altimeters use an aneroid barometer with a scale graduated in altitude instead of pressure.
It is characterized by decreasing air temperature with increasing altitude and by the considerable amount of water vapor. Its limit varies between 10 and 20 km in altitude, depending on the place's latitude.
The pressure change over a fixed distance at a fixed altitude. The larger the pressure gradient the stronger the winds.
Prevailing wind
A wind that blows from one direction more frequently than any other during a given period.
DOWN SLOPE- A wind that decreases in altitude above sea level as it moves due to the air moving into a lower elevation. Downsloping air tends to decrease in relative humidity and it warms adiabatically.
(Animation 55K) Winds at a high altitude turn in an anticlockwise direction (in the southern hemisphere). Winds at sea level turn in a clockwise direction.
Figure 1.
(MSL) (1) The average sea surface level for all stages of the tide over a 19-year period, usually determined from the hourly heights observed above a fixed reference level. (2) In aerology, the reference surface for all altitudes.
A system consisting of 25 satellites in 6 orbital planes at 20,000 km altitude with 12 hr periods, used to provide highly precise position, velocity and time information to users anywhere on Earth or in its neighborhood at any time.
Contrails - Long, narrow, ice-crystal clouds that form behind jet planes flying at high altitudes in below-freezing temperatures. They result from the condensation of water vapor remaining in jet exhaust.
Inversion - Temperatures increasing with increased altitude, or height. A negative lapse rate.
Isobar - A line of constant pressure.
Cloud - A visible collection of very fine water droplets or ice crystals suspended in the atmosphere at altitudes from just above the ground to several miles above sea level.
Center: Generally 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.
 See also: Surface, Air, Atmosphere, Temperature, Weather
|
