Same as atmospheric pressure.

Apparatus designed to measure and record the size distribution of raindrops as they occur in the atmosphere.

Cathode Ray Tube. A display element, consisting of a vacuum tube and screen, used with computers.

A device for obtaining a continuous record of stage at a point on a stream. The most common recorders consist of a float-actuated pen which traces a record on a clock driven chart.

A system in which radar techniques are used to determine the range, elevation, and azimuth of a radar target carried a!oft by a radiosonde, so that wind data may be obtained along with the other meteorological data.

In general, any self-recording instrument carried aloft by any means to obtain meteorological data.

A form of data transmission in which the bits of each character are sent one at a time along a single communication path. Compare to parallel data transmission.

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

A unit of pressure equal to 10' dyne per cm-' (101 barye), 1000 millibars. 29.53 inches of mercury.

A type of atmometer. It is a pan used in the measurement of the evaporation of water into the atmosphere. The NWS Class A pan is a cylindrical container 48 inches in diameter and 10 inches deep.

The audio-frequency signal transmitted by the Diamond-Hinman radiosonde when the baroswitch pen passes each fifteenth contact of the commutator, up to a number determined by the design of the commutator, and each fifth contact thereafter. This signal is t ...

The level at which ice crystals and snowflakes melt as they descend through the atmosphere.

A type of recording siphon barometer. The mechanically magnified motion of a float resting on the lower mercury surface is used to record atmospheric pressure on a rotating drum.

Any sudden and heavy rain, almost always of the shower type.

The play or loose motion in an instrument due to the clearance existing between mechanically contacting parts.

The ratio of the actual amount of water evaporated into the atmosphere to the evaporative power. Also called relative evaporation.

The actual time during which physical events take place.

Eluding precise prediction, completely irregular.

Same as instrument shelter.

A thin metal disc partially evacuated of air used to measure atmospheric pressure by measuring its expansion and contraction.