See gain.

Wind with a speed between 28 and 55 knots (32 and 63 mph); Beaufort scale numbers 7 through 10.

Abbreviation for the pressure, temperature, and humidity data obtained by a radiosonde observation.

In radiometry, a measure of the intrinsic radiant intensity emitted by a radiator in a given direction.

Abbreviation for precipitation-evaporation quotient.

The unit of acceleration in the centimeter-gram-second system of units, equal to one cm per sec2. Commonly used in gravimetry.

A thermometer designed for use in measuring the temperature of sea water. One form consists of a mercury-in-glass thermometer protected by a perforated metal case. Another form consists of a mercury-in-glass thermometer surrounded by a metal case which fo ...

A method of winds aloft observation essentially the same as a pilot balloon observation except the height data is derived from the radiosonde observation rather than from assumed ascension rates.

The energy of any type of electromagnetic radiation. Also called radiation.

A unit of luminance (or brightness) equal to 1/6 candles per square centimeter.

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

A radar which is used to obtain the azimuth elevation, and slant range of an airborne target.

A radiosonde equipped to measure temperature only.

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.

Name applied to a class of instruments which measure the liquid content of the atmosphere.

Generally, a measure of the departure of the mean daily temperature from a given standard, one degree day for each degree (

An atmospheric phenomenon, other than clouds, which obscures a portion of the sky from the point of observation. Also called obscuration.

A type of cyanometer. an instrument used to measure the blueness of the sky. The Linke-scale is simply a set of eight cards of different standardized shades of blue. They are evenly numbered 2 to 26. The odd numbers are used by the observer if he or she j ...

Any soft, gentle breeze.

The source of illumination for an antenna reflector. Also called antenna feed.