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.

Integrated Flood Observing and Warning System. National Weather Service flood warning program.

Precipitation of very small, white opaque particles of ice, fairly flat or elongated, with diameters less than 1 mm. The solid equivalent of drizzle.

Temperature of equilibrium between the liquid and vapor phases of a substance at a given pressure.

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

in United States weather observing practice, the highest "instantaneous" wind speed recorded at a station during a specified period, usually the 24-hour observation day. Therefore, a peak gust need not be a true gust of wind.

A halo consisting of a faint white circle passing through the Sun and running parallel to the horizon for as much as 360

A system of physical units based upon the use of the meter, the metric ton (106 grams), and the second as elementary quantities of length, mass, and time, respectively.

Abbreviation for precipitation effectiveness index.

Apparatus in which radar techniques are used to determine the range, elevation, and azimuth of a balloonborne target, to computer upper-air wind data. It is a type of rawin system.

In general, pertaining to or affording an overall view. In meteorology, this term has become somewhat specialized in referring to the use of meteorological data obtained simultaneously over a wide area for the purpose of obtaining a comprehensive and near ...

A system of designating meteorological observing stations by number. established and administered by the World Meteorological Organization. Under this scheme, specified areas of the word are divided into "blocks" each bearing a two-number designator. Stat ...

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

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

A numbering system using a base number of 2 and having only two digits: 0 and 1. The fundamental system of representing information with electrical pulses.

A rain gauge or array of rain gauges designed to measure the inclination and direction of falling rain.

Same as photometer.

A thermometer consisting of a clock mechanism the speed of which is a function of temperature.

The frequency of a carrier wave.

Same as aneroid barometer. Holostelic means wholly made of solids, while aneroid means devoid of liquid.