A type of climatic diagram whose coordinates are some form of temperature vs. a form of humidity or precipitation.

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

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

The stage on a fixed river gauge at which it is necessary to begin issuing warnings or river forecasts if adequate precautionary measures are to be taken before flood stage is reached.

Extended Binary Coded Decimal Interchange Code. A standard code used to represent data using 8 bits per character.

An instrument that shows changes in humidity.

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.

Name sometimes given to a transmissometer.

General term for an instrument which records the vertical electric current in the atmosphere.

That part of an audio-modulated radiosonde consisting of the baroswitch, the sensing elements, the reference elements, and the relay.

An anemometer utilizing the principle that the pitch of the aeolian tones generated by air moving past an obstacle is a function of the speed of the air. Largely a curiosity and has been put to no practical application in modem meteorology.

The nautical mile is closely related to the geographical mile which is defined as the length of one minute of arc on the earth's equator. By international agreement, the nautical mile is now defined as 1852 meters.

Same as rain-intensity gauge.

A clock-driven device for recording the time of occurrence of an event or the time interval between the occurrence of events.

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

A white disk 12" or more in diameter which is lowered into the sea to estimate transparency of the water. The depths are noted at which it first disappears when lowered and reappears when raised.

The actual time during which physical events take place.

Solar and terrestrial radiation directed downwards (towards the earth's surface); incoming radiation.

Instrument for measuring the depth of water from precipitation that is assumed to be distributed over a horizontal, impervious surface and not subject to evaporation.

An element that can control current without moving parts, heated filaments, or vacuum gaps.