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

A protective coating applied to circuits.

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.

An instrument, located at the surface observing station, which is used to record the data presented by a radiosonde aloft.

A clockwise change in wind direction. Veering winds with height are indicative of warm air advection (WAA).

The record obtained from a bolometer.

A unit of energy equal to 101 ergs or to 0.2389 calories.

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

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.

An instrument for photographing the corona and prominences of the sun at times other than at solar eclipse.

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 ...

In folklore, a name for rain.

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

In meteorology, a deflecting force acting on a body in motion and resulting from the earth's rotation. It deflects air currents to the right in the northern hemisphere and to the left in the southern hemisphere, thus having an effect on wind direction.

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.

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

A device attached to a meteorological instrument to provide ventilation; usually a suction fan.

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

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

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.