The maximum rate at which precipitation can pass through the surface into the soil, for a given soil in a given condition.

United Kingdom forecast model. (Available via AccuWeather.com Professional.)

Any emission of light at temperatures below that required for incandescence.

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

Abbreviation for mean sea level.

Precipitation caused by the ascent of moist air over an orographic barrier such as a Mountain range.

A system of estimating and reporting wind speed, originally based on the effect of various wind speeds on the amount of canvas that a full-rigged nineteenth century frigate could carry.

A common type of liquid-inglass thermometer, used, in meteorology, in psychrometers and as a maximum thermometer.

A current meter consisting of six conical cups, mounted around a vertical axis, which rotate and generate a signal with each rotation. Tail vanes and a heavy weight stabilize the instrument.

The maximum deviation of any points from a straight line drawn as a "best fit" through the calibration points of an instrument with a linear response curve. Usually expressed as a percentage of full- scale range.

A modification of the dew cell used in radiosonde equipment.

An air-launched balloon designed to be released in the eye of a tropical cyclone, float within the eye at predetermined levels, and transmit radio signals for RDF positioning.

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

National Weather Service. Administered by the U.S. Department of Commerce.

Physical equipment used in data processing. Compare to firmware, software.

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 rocket designed primarily for routine upper air observations in the lower 250,000 feet of the atmosphere, especially that portion inaccessible to balloons (above 100,000 feet).

Value of soil moisture, expressed as a percentage of the mass of dry soil, below which a plant living in the soil dies by wilting.

The atmospheric pressure at the level of the barometer. May or may not be the same as station pressure.

Same as photometer.