An instrument which measures the rate of evapotranspiration. It consists of a vegetation soil tank so designed that all water added to the tank and all water left after evapotranspiration can be measured.

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

The process whereby a position on the scale of an instrument is identified with the magnitude of the signal (or input force) actuating the instrument.

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 It is lowered into the sea on a line until it has had time to reach the temperature of the surface water, then withdrawn and read.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 ...

The processing of the form or mode of a signal so as to make it intelligible to, or compatible with, a given device.

The ceiling classification which is applied when the ceiling height is determined by timing the ascent and disappearance of a ceiling balloon or pilot balloon.

The value of atmospheric pressure to which the scale of a pressure altimeter is set so as to indicate airport elevation. The altimeter setting is included as part of an aviation weather observation.

Read Only Memory. A memory that cannot be altered in normal use of a computer, Usually used to store information permanently, such as firmware programs.

A device for measuring the frequency of occurrence of atmospherics whose intensity is greater than a predetermined level.

The cardinal points of the compass, i.e. north, south, east, west.

A fixed-length group of bits representing the large data element handled as a unit by a computer. Word length is determined by the capacity of the CPU registers.

Sustained winds greater than or equal to 40 mph or gust greater than or equal to 58 mph.

The portion of the strearnflow during any month or year derived from precipitation in previous months or years.

That temperature at which, in a specified latitude, the reading of a particular barometer requires no temperature or latitude correction.

A type of cistern barometer in which the level of mercury in the cistern is adjusted to the zero point of the scale before each reading.

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.

Same as marine rainbow.

The direction toward which the wind is blowing; with the wind.

Barometer in which pressure is determined by balancing air pressure against the weight of a column of mercury in an evacuated glass tube.

The ratio of the output of an instrument to the input value, i.e. a rain gauge with a sensitivity of 1 tip per 0.01"