Reflectivity Factor - the result of a mathematical equation (called the Weather Radar Equation) that converts the analog power (in Watts) received by the radar antenna into a more usable quantity.
reflectivity
relative humidity
At a given ambient air temperature, the dimensionless ratio between the actual vapor pressure of air to the saturation vapor pressure. Corresponding ratios of mixing ratio can be substituted.
Reflectivity - Radar term referring to the ability of a radar target to return energy; used to derive echo intensity, and to estimate precipitation intensity and rainfall rates. See dBZ, VIP.
Reflectivity
We are able to obtain useful information from the NEXRAD site by transmitting a radio signal and analyzing any echoes that may be reflected back.
REFLECTIVITY A measure of the process by which a surface can turn back a portion of incident radiation into the medium through which the radiation approached. It also refers to the degree by which precipitation is able to reflect a radar beam.
Reflectivity: A measure of the fraction of incident radiation falling on a surface that is turned back from it by reflection. Reflectivity also refers to the degree by which precipitation is able to reflect a radar beam.
Reflectivity The radar operator uses this radar product to determine the strength or the intensity of a precipitation target. In order for the radar to calculate the reflectivity, it sends out a small burst of energy.
Base Reflectivity
One of the three fundamental quantities (along with base [radial] velocity and spectrum width) that a Doppler radar measures.
Base Reflectivity (R): This WSR-88D radar product depicts a full 360 degree sweep of echo intensity data. It is available for every elevation angle that is sampled in a volume scan.
radar reflectivity"In general, a measure of the efficiency of a radar target in intercepting and returning radio energy. It depends upon the size, shape, aspect, and dielectric properties of the target.
Radar Reflectivity - permalink - collapse
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The sum of all backscattering cross-sections (e.g., precipitation particles) in a pulse resolution volume divided by that volume.
Reflectivity of a cloud is dependent on the number and type of hydrometeors, which includes rain, snow, and hail, and the hydrometeors' size. A large number of small hydrometeors will reflect the same as one large hydrometeor.
Reflectivity-weighted average velocity of targets in a given pulse resolution volume. Usually determined from a large number of successive radar pulses. Also called mean radial (towards or away from the antenna) velocity.
The reflectivity of a surface. It is the percent of radiation reflected from a surface compared to the radiation striking it. A perfectly reflective surface would have an albedo of 100.
3. The reflectivity (albedo) of the moon is 7 percent. This means that the moon reflects 7 percent of the sunlight it intercepts.
4. Here on earth it is known as moonlight.
6. The earth's reflectivity (albedo) is 30%.
A radar reflectivity pattern observed in a thunderstorm, appearing like a fish hook and indicating favorable conditions for tornadic development. However, hook echoes and tornadoes do not always accompany each other.
HORIZON ...
BR - Base Reflectivity. The amount of radar reflectivity from a target, such as a thunderstorm. Unit of measure is a DBZ.
The RDA collects the unprocessed, analog voltages from the radar antenna and converts the signal to base reflectivity , base velocity, and spectrum width (in polar coordinate form).
WERWeak Echo Region - Radar term for a region of relatively weak reflectivity at low levels on the inflow side of a thunderstorm echo, topped by stronger reflectivity in the form of an echo overhang directly above it.
However, the radiation received by the radar antenna consists of the average reflectivity across the entire beam, so the reflectivity and associated rainfall rates are underestimated.
dBZNondimensional "unit" of radar reflectivity which represents a logarithmic power ratio (in decibels, or dB) with respect to radar reflectivity factor, Z.
ALBEDO The percent of reflectivity of wavelengths of an object's surface. This varies according to the texture, color, and expanse of the object's surface.
The albedo is to be distinguished from the reflectivity, which refers to one specific wavelength. Albedometer An instrument used for the measurement of the reflecting power (the albedo) of a surface.
ice and snow albedo The reflectivity of ice and snow-covered surfaces. The albedo of freshly fallen snow may be as much as 90%, while older snow may have values of 75% or less.
It may be thought of as the reflectivity weighted ratio velocity distribution of the scatterers in a distributed target.radar reflectivityA measure of the efficiency of a radar target intercepting and returning radio energy.
Meteorologists and climatologists use this term to refer to the characteristic reflectivity of a surface or composite landscape.
Radar term for a region of relatively weak (reflectivity at low levels on the inflow side of a thunderstorm echo, topped by stronger reflectivity in the form of an echo overhang directly above it (see Fig. 2).
cell - In radar usage, a local maximum in radar reflectivity that undergoes a life cycle of growth and decay.
The magnitude of the reflectivity is related to the number and size of the drops encountered by the electromagnetic pulse. For this reason, high reflectivity generally implies heavy precipitation while low reflectivity implies lighter precipitation.
BRIGHT BAND- A maximum in the radar reflectivity caused by snow melting as it falls. Melting snow can have a reflectivity similar to small hail.
Refers to radar echo signatures with low reflectivity in the center, surrounded by higher reflectivity. It is associated with strong updrafts and is found in the inflow region of a thunderstorm. Related term: vault ...
However, other factors can affect reflectivity, such as width of the radar beam, precipitation type, drop size, or the presence of ground clutter or AP.
Albedo or surface reflectivity. The ratio of the amount of electromagnetic radiation reflected by a body (surface) to the amount incident upon it, commonly expressed as a percentage.
Always appears on the side of the sky opposite of the sun.
reflectivity: a measure of how well a surface turns the part of the radiation it receives back in the direction from which the radiation came.
Radar echo: The energy scattered back from a target and detected by the radar receiver. The amount of energy received by the radar is the reflectivity.
Radiant energy. See Radiation ...
bright band—In radar meteorology, a narrow, intense echo on the range-height indicator scope resulting from water-covered ice particles of high reflectivity at the melting level.
There are grey shades to indicate different levels of albedo (or reflectivity).
 See also: Radar, Weather, Precipitation, Air, Surface
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