An instrument for measuring the difference between incoming and outgoing terrestrial radiation.

A wind blowing in the same direction as the heading of a moving object. thus assisting the object's intended progress. The opposite of a head wind.

Wind with a speed between 28 and 33 knots (32 and 38 mph); Beaufort scale number 7.

A definite portion of a stream channel, commonly taken between two gauging stations, but may be taken between any two specified points.

An apparatus, used in studying soil temperatures, for measuring the total supply of heat during a given period.

Precipitation caused by the ascent of moist air over an orographic barrier such as a Mountain range.

A direct-vision nephoscope which is constructed in the following manner: a comb consisting of a crosspiece containing equispaced vertical rods is attached to one end of a column eight to ten feet long and is supported on a mounting that is free to rotate ...

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

That part of snow melt that reaches stream channels as runoff.

Abbreviation for visual flight rules, but commonly used to refer to the relatively favorable weather and/or flight conditions to which these rules apply.

A very sensitive electrostatic electrometer for measuring small potential differences.

A type of anemometer in which the rotation of an element serves to measure the wind. Rotation anemometers are divided into two classes; those in which the axis of rotation is horizontal, such as the windmill anemometer, and those in which the axis of rota ...

The record of an aneroid barograph.

A pyrheliometer of the thermoelectric type. Radiation is allowed to fall on two concentric silver rings, the outer covered with magnesium oxide and the inner covered with lamp black. A system of thermocouples (thermopile) is used to measure the temperatur ...

A class of instruments employed to determine the electric potential at a point in the atmosphere, and ultimately the atmospheric electric field.

The officially designated elevation of an airport above mean sea level, taken as the highest point on any of the runways of the airport. Same as airport elevation.

A temperature scale with the ice point at 273 degrees and boiling point of water at 373 degrees. It is intended to approximate the Kelvin temperature scale with sufficient accuracy for many sciences, notably meteorology.

Occupational Safety and Health Administration. A regulatory office of the U.S. Department of Labor.

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

Temperature of equilibrium between the liquid and vapor phases of a substance at a given pressure.