A thermometer which utilizes the thermal properties of gas. There are two forms of this instrument: (a) a type in which the gas is kept at constant volume, and pressure is the thermometric property, and (b) a type in which the gas is kept at constant pres ...

A unit of pressure equal to 10' dyne per cm-' (101 barye), 1000 millibars. 29.53 inches of mercury.

A radar which is used to obtain the azimuth elevation, and slant range of an airborne target.

The total infrared radiation emitted from the earth's surface. To be carefully distinguished from atmospheric radiation, effective terrestrial radiation, and insolation.

A contact anemometer connected to an electrical circuit which is so arranged that the average wind speed is indicated.

A device used to switch electrical current at a selectable setpoint temperature.

A hygrometer in which the sensitive element is a strand or strands of human hair, the length of which is a function of the relative humidity of the air.

Wind with a speed below 1 knot (1 mph); Beaufort scale number 0.

Same as precipitation- effectiveness index.

A tube designed to measure the rate of flow of fluids. It consists of a tube having a constriction or throat at its midsection. The difference between the pressure measured at the inlet and at the throat is a function of the fluid velocity. Compare to Pit ...

Same as altimeter setting.

Extended Binary Coded Decimal Interchange Code. A standard code used to represent data using 8 bits per character.

A radiosonde whose carrier wave is switched on and off in such a manner that the interval of time between the transmission of signals if a function of the magnitude of the meteorological elements being measured.

An instrument, dropped from high attitude and carried by a stable parachute. used to measure the vertical component of turbulence aloft.

The center of an area of high pressure, usually accompanied by anticyclonic and outward wind flow. Also known as an anticyclone.

A rainbow seen in the spray of the ocean. It is optically the same phenomenon as the ordinary rainbow.

Determined by weighing a special type of wooden stick that has been exposed in the woods, its weight being proportional to its contained water.

A curve showing the variation of temperature with height in the free air. See lapse rate.

An instrument which measures the intensity of radiation by determining the amount of chemical change( or fluorescence produced by that radiation.

A device used to hold liquid-in-glass maximum and minimum thermometers in the proper recording position inside an instrument shelter, and to permit them to be read and reset. See Townsend support.