See hydrologic accounting.

A subtle, diumal component of the wind velocity leading to a diumal shift of the wind or turning of the wind with the sun, produced bv the east-to-west progression of daytime surface heating.

Strong winds concentrated within a narrow band in the atmosphere. The jet stream often "steers" surface features such as front and low pressure systems.

A modification of the dew cell used in radiosonde equipment.

Apparatus designed to measure and record the size distribution of raindrops as they occur in the atmosphere.

The difference between downward and upward (total) radiation; net flux of all radiation.

In physics, any process in which the flux density (or power, amplitude, intensity, illuminance, etc.) of a "parallel beam" of energy decreases with increasing distance from the source. Attenuation is always due to the action of the transmitting medium its ...

The process by which small particles suspended in a medium of a different refractive index diffuse a portion of the incident radiation in all directions. In scattering no energy transformation results, only a change in the spatial distribution of the radi ...

Companion to the wet-bulb thermometer in a psychrometer. Used to measure ambient air temperature.

A warm, dry wind on the lee side of a mountain range, the warmth and dryness due to adiabatic compression upon descent.

An instrument for measuring temperature by utilizing the variation of the physical properties of substances according to their thermal states. Thermometers may be classified into types according to their construction; deformation thermometer, electrical t ...

The depth of water that would result from the melting of snow or ice, assuming measurement on a horizontal surface and no infiltration or evaporation.

A point (or line) on a scale used for reference or comparison purposes. In calibration of meteorological thermometers, for example, the fiducial points are 100

The frequency of a carrier wave.

The decrease of an atmospheric variable with height, the variable being temperature, unless otherwise specified.

The humidity transducinu element in a Diamond-Hinman radiosonde. Also called electrolytic strip.

A feeble oscillatory disturbance of the earth's crust, detectable only by very sensitive seismographs. Certain types of microseisms seem to be closely correlated with pressure disturbances. See microbarm.

The average temperature of the air as indicated by a properly exposed thermometer for a given time period, usually a day, a month, or a year.

Name sometimes given to a transmissometer.

A fixed-length group of bits representing the large data element handled as a unit by a computer. Word length is determined by the capacity of the CPU registers.