Occupational Safety and Health Administration. A regulatory office of the U.S. Department of Labor.

A temperature telemeter.

A motorlike device containing a rotor and a stator and capable of converting an angular position into an electrical signal, or an electrical signal into an angular position. When several synchros are correctly connected, all of the rotors will align thems ...

An instrument for determining the direction from which radio waves approach a receiver. It may consist of a manually operated direction indicator, or it may use a servo system to position the antenna automatically in the direction of the incident waves.

Routine broadcast of meteorological information for aircraft in flight.

The transmission of data collected at a remote location over communications channels to a central station.

Same as dropsonde.

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

The condition of the atmosphere when the amount of water vapor present is the maximum possible at the existing temperature.

Pyrheliometer based on the comparison of the heating of two identical metal strips, one exposed to radiation, the other to a joule effect.

A fabric cone attached to a metal ring and used to indicate wind direction. often at airfields.

The state of the atmosphere, mainly with respect to its effects upon life and human activities. As distinguished from climate, weather consists of the short-term (minutes to months) variations of the atmosphere.

A contact anemometer connected to an electrical circuit which is so arranged that the average wind speed is indicated.

A recording weight barometer.

Any twelve-month period, usually selected to begin and end during a relative dry season. Used a basis for processing streamflow and other hydrologic data. The period from October 1 to September 30 is widely used in the U.S.

Nested Grid Model generated every 12 hours by NCEP.

Sir Napier Shaw's name for the approximate absolute temperature scale,

Wind with a speed between 4 and 6 knots (4 and 7 mph), Beaufort scale number 2.

The upper surface of a column of liquid.

A point (or line) on a scale used for reference or comparison purposes. In calibration of meteorological thermometers, for example, the fiducial points are 100