In folklore, a name for rain.

A small balloon used to determine the height of the cloud base. The height can be computed from the ascent velocity of the balloon and the time required for its disappearance into the cloud.

A recording anemometer.

A numbering system using a base number of 2 and having only two digits: 0 and 1. The fundamental system of representing information with electrical pulses.

The record obtained from a bolometer.

A barometer which measures atmospheric pressure using one or a series of aneroid capsules. Also called holosteric barometer.

A reversing thermometer (for seawater temperature) which is not protected against hydrostatic pressure. The mercury bulb is therefore squeezed, and the amount of mercury broken off on reversal is a function of both temperature and of hydrostatic pressure.

A buoyant balloon kept from rising freely by means of a line secured to a point on the ground, as opposed to a free balloon. See kytoon.

Central Processing Unit. The part of a computer which controls and directs all functions.

The maximum difference in output for any given input (within the specified range) when the value is approached first with increasing, and then with decreasing, input signals. Caused by energy absorption in the elements of the measuring instrument. Usually ...

An instrument for the measurement of both solar and terrestrial radiation.

An instrument whose calibration is determined by comparison with an absolute instrument.

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

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

An ice coating with a consistency intermediate between glaze and rime.

A system of physical units based on the use of the centimeter, gram. and the second as elementary quantities of length. mass. and time.

The effect upon the measurement of rainfall caused by the presence of the rain gauge.

A chronograph used to make a time-record of certain measured meteorological elements. The most common type, the triple register, records wind direction and speed, duration of sunshine, and amount of rainfall (sensed respectively by a contact anemometer, M ...

The correction applied to an instrument to account for the effect of temperature upon its response characteristics.

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.