An addition to a rawinsonde system which allows determination of the slant range to the radiosonde.

pattern barometer-Mercurial barometer with a fixed scale and cistern and which therefore requires only one adjustment before each reading.

A unit of signaling speed representing the number of code elements sent per second; often, bits per second.

A type of cloud height indicator which uses a searchlight to project vertically a narrow beam of light onto the cloud base. The height of the cloud is determined using a clinometer, located at a known distance from the ceiling light, to measure the angle ...

A measure, proposed by Angstrom, of the precipitation effectiveness of a region.

Same as precipitation-evaporation ratio.

A calorimetric radiation instrument of historic interest used for the measurement of outgoing heat radiation from the earth during an interval of time. The time integration is performed by allowing the radiation to fall on an uninsulated vessel containing ...

A radar term for a single pulse of radio energy.

Of equal or constant pressure, with respect to either space or time.

A clock-driven instrument mounting which automatically and continuously points in the direction of the sun. It is used with a pyrheliometera,hen continuous direct solar radiation measurements are required.

A recording siphon barometer.

Quantitative Precipitation Forecast.

An effect noted primarily in wet snow conditions when snow clings to the sides of a precipitation gauge and gradually accumulates until the gauge orifice is capped with accumulated snow. This effect can be minimized by using large collectors, and wind scr ...

A number of quantity defining a limit that errors will not exceed when a device is used under specified operating conditions. Accuracy rating can be expressed in a number of forms, i.e. in terms of the measured variable (+/- 1 C), percent of span (+/-0.5% ...

The record of a barograph.

Generally, an instrument designed to measure or estimate the blueness of the sky. See Linke-scale.

The process by which one object becomes adhered to another by the binding action of ice.

A general term for instruments which sample atmospheric suspensoids by impaction. Same as impactometer.

A conically shaped, copper rain gauge shield.

An instrument for determining the direction from which radio waves approach a receiver. It may consist of a manually operated direction indicator, or it may use a servo system to position the antenna automatically in the direction of the incident waves.