Same as rain gauge.

The statement that the viscosity of air is independent of the density of air.

A standard unit of atmospheric pressure, defined as the pressure exerted by a 760 mm column of mercury at standard gravity (980.665 cm/sec2 ) at O

The ratios, to the mean wind speed, of the average magnitudes of the component fluctuations of the wind along three mutually perpendicular axes.

An atmospheric sounding instrument which is supported by a captive balloon and used to obtain temperature and humidity data from the ground level to a height of a few thousand feet. The data is telemetered to the ground through a wire cable.

The cardinal points of the compass, i.e. north, south, east, west.

A temperature scale based on absolute zero. Same as Kelvin temperature scale.

A vector term which includes both wind speed and wind direction.

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.

The length of fluid flow (gas or liquid) past a sensor required for the sensor to respond to 63.2% of a step change in speed. Expressed in feet or meters. For anemometers, this value is calculated from time constant times wind tunnel speed.

An ice coating with a consistency intermediate between glaze and rime.

See aneroid capsule.

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

A radar term for a single pulse of radio energy.

Transistor-Transistor Logic.

The value of atmospheric pressure to which the scale of a pressure altimeter is set so as to indicate airport elevation. The altimeter setting is included as part of an aviation weather observation.

Navy Operational Global Atmospheric Prediction System. A global meteorological model operated by the Department of Defense.

The temperature at which an object gives out as much radiation as it receives from its surroundings.

Any horizontal wind velocity tangent to the contour line of a constant pressure surface (or to the isobar of a geopotential surface) at the point in question.

The transmission of data collected at a remote location over communications channels to a central station.