Parameter

Parameter 1) A term used loosely by many meteorologists for almost any meteorological quantity or element. 2) An arbitrary constant or variable so appearing in a mathematical expression that changing it gives various cases of the phenomenon ...

The Rossby parameter is a nondimensional number used in geophysics and meteorology which arises due to the northward variation of the Coriolis force caused by the spherical shape of the Earth. It is important in the generation of Rossby waves.

parameter - 1. In general, any quantity of a problem that is not an independent variable.

Parameters Terms for using data resources. CD-ROM available. Credits and Acknowledgments for WW2010. Department of Atmospheric Sciences (DAS) at the University of Illinois at Urbana-Champaign.

R1910 Rossby parameter Parameter (B) expressing the latitudinal variation of the Coriolis parameter, arising from the sphericity of the Earth, expressed as: b = d/dy(2Wsinf) = 2Wcosf/a, where W is the angular velocity of the Earth; f, the latitude; ...

dimensionless parameter"See nondimensional parameter. dimensions"See fundamental dimensions. dimethyl disulfide"Naturally occurring sulfur gas, formula CH3SSCH3; minor constituent in the natural sulfur cycle.

DAMPING RATIO: A parameter used to describe the response of a wind vane to a sudden change in wind direction.

ParameterA subset of the group of evaluations that constitute each element of an observation.

RecurrenceUsed especially in reference to the recurrence of physical parameters every 27 days (the rotation period of the sun) ...

Thiele-Small Parameters Audio: A set of parameters used to describe the audio characteristics of a speaker driver, named for Neville Thiele and Richard Small.

of pressure, temperature, and humidity; a modulator for the conversion of the output of the transducers to a quantity which controls a property of the radio frequency signal; a selector switch which determines the sequence in which the parameters are ...

seasonal variation The change in a set of meteorological parameters averaged over three months. Seasonal variation is the largest climatic variation, and temperature is the most fre- quently observed meteorological parameter.

single-column modeling (SCM) An approach to the development and testing of cloud formation and parameterizations.

ADAPTATION (ADAPTABLE) PARAMETERGenerally, data related to a specific WSR-88D unit.

Parameter: Elements which make up a weather observation such as present weather/visibility/temperature/pressure, etc. Parcel: A small volume of air.

The method is emperical and considers a number of parameters (ingredients) which cause snowfall, ...

Since both parameters are important for severe weather development, higher values generally indicate a greater potential for severe weather.

Radiosonde A balloon-borne instrument that measures meteorological parameters from the Earth's surface up to 20 miles in the atmosphere. The radiosonde measures temperature, pressure, and humidity, and transmits or "radios" these data back to Earth.

Weather forecasting includes the use of objective models based on certain atmospheric parameters, along with the skill and experience of a meteorologist. Also called a prediction.

Variations in meteorological parameters such as temperature and relative humidity over the course of a day which result from the rotation of the Earth about its axis and the resultant change in incoming and outgoing radiation.

Difluence in an upper level wind field is considered a favorable condition for severe thunderstorm development (if other parameters are also favorable). But difluence is not the same as divergence.

Composite Chart - a map constructed by overlaying critical values of atmospheric parameters analyzed to assess severe weather potential.

External processes, such as solar-irradiance variations, variations of the Earth's orbital parameters (eccentricity, precession, and inclination), lithosphere motions, and volcanic activity, are factors in climatic variation.

NORMAL- The average of a certain weather parameter over several years (commonly 30 or more years). For example, the normal yearly precipitation being 30 inches means that over a 30 year period the average is 30 inches per year.

This is a derived parameter which quantifies the tendency for airflow in the lower levels of the troposphere to 'corkscrew' and thus encourage the formation of storms with strong mesoscale circulations, possibly leading to tornadic activity.

gradient—In meteorology, a horizontal decrease in value per unit distance of a parameter in the direction of maximum decrease; most commonly used with pressure, temperature, and moisture.

The parameters may include temperatures (high, low, and deviation), pressure, precipitation (rain, snow, etc.), winds (speed and direction), thunderstorms, amount of clouds, percent relative humidity, etc.

Sounding: a set of data measuring the vertical structure of one or more atmospheric parameters (e.g., temperature, humidity, pressure, wind) at a given time. Specific gravity: the ratio of the density of any substance to the density of water.

Sky Condition- The state of the sky in terms of such parameters as sky cover, layers and associated heights, ceiling, and cloud types. Sky Cover- The amount of the sky which is covered by clouds or obscurations in contact with the surface.

Radiosonde - an instrument lifted into the air via balloon that measures various atmospheric parameters such as temperature, pressure wind and humidity. Rain - The Wet Stuff.

STORM RELATIVE - Estimation of wind, moisture, and temperature parameters with storm motion taken into consideration.

The temperature difference between 850 mb and 500 mb is used to parameterize the vertical temperature lapse rate. The 850 dew point provides information on the moisture content of the lower atmosphere.

Nevertheless it can be useful to look at an index to help in determining if conditions are unfavourable to undertake strenuous sporting activity. Wet Bulb Global Temperature (WBGT) is a parameter that is often used for this purpose.

FORECAST A statement of expected future occurrences. Weather forecasting includes the use of objective models based on certain atmospheric parameters, along with the skill and experience of a meteorologist. Related term: prediction ...

Albedo is not a constant parameter. It depends for example on the altitude of the sun. The highest values are reached when the sun is positoned near horizon. It also depends on the properties of the surface, e.g.

Ocean currents and water temperatures have more influence on climate than do purely meteorological parameters. Whether the earth is cooling or warming has more to do with the oceans than the atmosphere and its short-term dynamics.

is designed to systematically solve a certain kind of problem. WSR-88D radars (NEXRAD ) employ algorithms to analyze radar data and automatically determine storm motion, probability of hail, VIL, accumulated rainfall, and several other parameters.

Usually' the vertical component of vorticity is implied. The absolute vorticity is the sum of the vertical component of the vorticity with respect to the Earth ( the relative vorticity) and the vorticity of the earth ( the coriolis parameter).

See also: Surface, Temperature, Air, Pressure, Atmosphere