An instrument which automatically determines the size distribution of raindrops.

A sounding balloon which, when operationally inflated, resembles an inverted teardrop.

An old nautical term for mercury barometer.

A numbering system using a base number of 16 and including the ten decimal digits (0 to 9) along with six alpha digits (A to F). Thus. a digit is available to represent each of the possible values of a 4-bit binary digit.

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

A thermopile used in some types of radiation instruments. See solarimeter.

A radar term for a single pulse of radio energy.

A scale of yellows, greens, and blues for recording the color of sea water, as seen against the white background of a Secchi disk.

Readily taking up and retaining moisture.

A graphical representation of a frequency distribution. The range of the variable is divided into class intervals for which the frequency of occurrence is represented by a rectangular column. The height of the column is proportional to the frequency of ob ...

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

Generally, an instrument designed to measure or estimate the blueness of the sky. See Linke-scale.

A thin metal disc partially evacuated of air used to measure atmospheric pressure by measuring its expansion and contraction.

A graphical aid used in fire weather forecasting to calculate the degree of forest-fire danger (or burning index). Commonly in the form of a circular slide rule, the firedanger meter relates numerical indices of (a) the seasonal stage of foliage, (b) the ...

The group of bits which a computer processes as a unit; often, 8 bits.

A fixed-length group of bits representing the large data element handled as a unit by a computer. Word length is determined by the capacity of the CPU registers.

An instrument designed to measure quantities of heat. Sometimes used in meteorology to measure solar radiation.

Same as dropsonde.

The true freezing point of water. The temperature at which a mixture of air-saturated pure water and pure ice may exist in equilibrium at a pressure of one standard atmosphere.

A type of cloud height indicator which uses a searchlight to project vertically a narrow beam of light onto the cloud base. The height of the cloud is determined using a clinometer, located at a known distance from the ceiling light, to measure the angle ...