An aviation weather forecast for a specific flight.

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.

Operation mode of a communication circuit in which each end can transmit and receive, but not simultaneously.

A device that allows a terminal or computer at one location to communicate with a terminal or computer at a distant location via wire or phone lines.

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 ...

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

In physics, any process in which the flux density (or power, amplitude, intensity, illuminance, etc.) of a "parallel beam" of energy decreases with increasing distance from the source. Attenuation is always due to the action of the transmitting medium its ...

check chamber-A chamber use to check the sensing elements of radiosonde equipment.

A method of upper air observation consisting of an evaluation of the wind speed and direction, temperature, pressure, and humidity aloft by means of a balloon-borne radiosonde tracked by radar or a radio theodolite.

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

A wave disturbance in airflow due to some barrier in the flow. i.e. a hill or mountain.

The statement that the viscosity of air is independent of the density of air.

An inert gas. An element found in the atmosphere to the extent of only 0.000114 percent by volume. Its molecular weight is 83.7.

Sustained winds greater than or equal to 40 mph or gust greater than or equal to 58 mph.

Not a linear function of the relevant variables.

An instrument which measures combined direct solar radiation and diffuse sky radiation. See pyrheliometer, Robitzsch actinograph. solarimeter. See also albedometer.

A recording pressure-tube anemometer in which the wind scale of the float manometer has been made linear by the use of springs, i.e. Dines anemometer.

Automated Local Evaluation in Real Time. Network of automatic rain gauges that transmit via VHF radio link when precipitation occurs. Some sites are also equipped with other sensors such as temperature, wind, pressure, river stage or tide level. More info ...

The distance or length of flow of the air past a point during a given interval of time.

The outer, solid portion of the earth: the crust of the earth.