A graphical representation of stage or discharge at a point on a stream as a function of time.

Instrument for measuring the mean intensity of glo global solar radiation (direct and diffuse) near the earth's surface in a specified time interval.

A pressure-plate anemometer consisting of a plate which is free to swing about a horizontal axis in its own plane above its center of gravity. The angular deflection of the plate is a function of the wind speed. This instrument is not used for station mea ...

See hurricane beacon.

An instrument for determining the dust content of a sample of air. Also spelled conimeter.

Abbreviation for radio frequency.

Eluding precise prediction, completely irregular.

See constant-level balloon.

Downward-facing pyranometer used for measuring reflected solar radiation.

A defective maximum thermometer of the liquid-inglass type in which the mercury flows too freely through the constriction. Such a thermometer will indicate a maximum temperature that is too low.

Amount of solar radiation incident, per unit area and time, on a surface which is perpendicular to the radiation and is situated at the outer limit of the atmosphere, the earth being at its mean distance from the sun. It equals approximately 2.00 ly/ min ...

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

The rising of cold water from the deeper areas of the ocean to the surface. This phenomena often occurs along the California coast during the spring and summer.

A systematic observational error due to the characteristics of the observer. The uncertainty in a reading made by an observer may be acertained by a statistical analysis of his or her readings.

Liquid water at temperatures colder than freezing.

A small, limited-capacity central processing unit contained entirely on one semiconductor chip.

Ragged low clouds, usually stratus fractus. Most often applied when such clouds are moving rapidly beneath a layer of nimbostratus.

Same as rain-intensity gauge.

The difference between the air temperature and the dew-point. Also called dew-point deficit, dew-point depression.

See hydrologic accounting.