The difference between the solar radiation directed downward and upward; net flux of solar radiation.

Any one of a family of circular arcs consisting of concentric colored bands, arranged from red on the inside to blue on the outside, which may be seen on a "sheet" of water drops (rain, fog, spray). The most common of the many possible is the primary rain ...

Determination of the total amount of snow covering a watershed or a given region. Both depth and water content of the snow may be measured, and the results may be used to predict the amount of water that will be available after melting.

Water condensed onto objects at or near the ground, due to the fact that their temperatures have fallen below the dew point temperature of the surrounding air, but not below freezing.

See aneroid capsule.

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

Same as evaporative power.

Same as rain-intensity gauge.

Electromagnetic radiation lying in the wavelength interval between 0.8 micron and I millimeter. At the lower limit of this interval, the infrared radiation spectrum is bounded by visible radiation, while on its upper limit it is bounded by microwave radia ...

One of the radiation laws which states that the wavelength of maximum radiation intensity for a black body is inversely proportional to the absolute temperature of the radiating black body.

The direction, with respect to true north, from which the wind is blowing. Distinguish from magnetic wind direction. In all standard upper-air and surface weather observations, it is true wind direction that is reported.

The volume of water required to cover one acre to a depth of one foot: 43,560 cubic feet.

A unit of luminance (or brightness) equal to 1/6 candles per square centimeter.

The process by which water in plants is transferred as water vapor to the atmosphere. Also, the amount of water so transferred.

Eluding precise prediction, completely irregular.

See hurricane beacon.

A thermometer used in aircraft which automatically corrects for adiabatic and frictional temperature rises by imparting a rotary motion to the air passing the thermal sensing element.

Name sometimes given to a transmissometer.

A graduated scale placed in a position so that the stage of a stream may be read directly from it. Staff gauges may be placed on bridge piers or pilings, etc., or placed on specially constructed supports.

Name sometimes given to a transmissometer.