A device which surrounds a rain gauge and acts to maintain horizontal flow in the vicinity of the funnel so that the catch will not be influenced by eddies generated near the gauge. See Alter shield, Nipher shield, Wild fence.

Same as pitot tube.

Wind with a speed between 48 and 55 knots (55 and 63 mph), Beaufort scale number 10.

An instrument designed to measure quantities of heat. Sometimes used in meteorology to measure solar radiation.

An instrument for the measurement of the net flux of downward and upward total (solar and terrestrial) radiation through a horizontal surface.

A unit measure of electrical conduction. The facility with which a substance conducts electricity, as represented by the current density per unit electrical-potential gradient in the direction of flow. Electrical conductivity is the reciprocal of electric ...

A protective coating applied to circuits.

A water-temperature thermometer provided with an insulated container around the bulb. It is lowered into the sea on a line until it has had time to reach the temperature of the surface water, then withdrawn and read. The insulated water surrounding the bu ...

Readily taking up and retaining moisture.

Abbreviation for binary digit. The smallest unit of information, equal to one binary decision, i.e. 1/0, on/off, yes/no.

A unit that represents one degree of deviation from a reference point in the mean daily outdoor temperature (usually 65

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 ...

Same as instrument shelter.

A general term for atmospheric water in any of its forms, i.e. clouds, fog, hail, ice crystals, rain.

Same as fogbow.

The mass density of a parcel of air expressed in units of mass per volume.

Same as Aeolian.

Lacking a relationship to a time base or clock. In asynchronous communications, individual data characters are sent at an arbitrary rate.

A precipitation amount of less than 0.005 inches. Also, the record made by any self-registering instrument.

A wind blowing in a direction perpendicular to the course of a moving object.