Same as pitot tube.

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

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

The height of the cloud base above the local terrain.

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 ...

An instrument for measuring the difference between incoming and outgoing terrestrial radiation.

An aviation weather forecast for a specific flight.

See ceilometer.

The ceiling classification which is applied when the ceiling height is determined by timing the ascent and disappearance of a ceiling balloon or pilot balloon.

A thermograph in which ventilation is provided by a suction fan.

That part of snow melt that reaches stream channels as runoff.

Same as dropsonde.

A relatively small-scale, upward moving current of air.

See hydrologic accounting.

An early and once universal name for the mercury barometer.

A recording hair hygrometer.

See calorie.

A pointed device which indicates the amount of resistance encountered when it is forced into a material such as snow or soil. See ram penetrometer.

Name sometimes given to a transmissometer.

A power supply which achieves its output regulation by means of one or more active power handling devices which are alternately placed in the "off" or "on" states. It is more efficient than linear supplies which vary the conduction of power devices to ach ...