A severe weather condition characterized by low temperatures and strong winds bearing a great amount of snow, either falling or picked up from the ground.

A temperature scale on which the freezing point of water equals 32

force wind-Wind with a speed above 64 knots (73 mph); Beaufort scale numbers 12 through 17.

A technique for making winds aloft observations in which two theodolites located at either end of a baseline follow the ascent of a pilot balloon. Synchronous measurements of the elevation and azimuth angles of the balloon. taken at periodic intervals, pe ...

Rate of wind movement in distance per unit time.

The transducer's output when the maximum sensed value is applied to the transducer's input. For example, the F.S. output of a 4-20 mA transmitter is 20 mA, whereas its span is only 16mA.

A type of climatic diagram whose coordinates are some form of temperature vs. a form of humidity or precipitation.

An instrument for studying, or examining substances in, polarized light. See Savant polariscope.

A term used to describe a sensor (or sensors), the associated transducer(s), and the data readout or recording device.

Same as constant-level balloon.

Area of a computer or other device where various logic and control elements are interconnected. Often a printed circuit board into which other circuit boards plug at right angles.

An instrument for determining the direction of cloud motion. There are two basic designs of nephoscope, the directvision nephoscope and the mirror nephoscope.

A type of hygrometer which measures the water vapor content of the atmosphere by means of the absorption of vapor by a hygroscopic chemical.

A hypothetical, ideal body which absorbs completely all incident radiation. independent of wavelength and direction. No actual substance behaves as a true black body, although platinum black and other soots rather closely approximate this ideal. However, ...

A hygrometer which uses a transducing element whose electrical properties are a function of atmospheric water vapor content. The humidity strip and carbon-film hygrometer element are examples of such a transducer.

The depth below which the ground is saturated with water. No water table exists if the ground water is confined by an overlying impermeable stratum, as in the case of artesian ground water.

A thermometer. the sensitive element of which consists of two metal strips which have different coefficients of expansion and are brazed together. The distortions of the system in response to temperature variations are used as a measure of temperature. It ...

A instrument designed to study small fluctuations of some quantity. The microbarograph is an example of a recording pressure variometer.

The condition of the atmosphere when the amount of water vapor present is the maximum possible at the existing temperature.

A line of equal or constant pressure.