An instrument, dropped from high attitude and carried by a stable parachute. used to measure the vertical component of turbulence aloft.

General name for an instrument which measures the earth's magnetic field intensity.

Video Display Terminal. An input and display device which includes a keyboard and a screen and allows a human to communicate with a computer.

A recording pressure-tube anemometer in which the wind scale of the float manometer has been made linear by the use of springs, i.e. Dines anemometer.

A unit that represents one degree of deviation from a reference point in the mean daily outdoor temperature (usually 65

Anemometer which measures wind speed by the speed of rotation of 3 or 4 hemispherical or conical cups, each fixed to the end of a horizontal arm projecting from a vertical axis. See condenser-discharge anemometer, contact anemometer. Compare to bridled-cu ...

Force wind-Wind with a speed above 64 knots (73 mph); Beaufort scale numbers 12 through 17.

A device for obtaining a continuous record of stage at a point on a stream. The most common recorders consist of a float-actuated pen which traces a record on a clock driven chart.

Pertaining to measurements or devices in which the output varies continuously, i.e. voltage or rotation signals. Compare to digital.

The process in which incident radiation is retained by a substance. A further process always results from absorption.

Balance of the water resources of a region, comparing precipitation and inflow with outflow, evaporation, and accumulation.

Binary Coded Decimal. A coding system in which each decimal digit from 0 to 9 is represented by a 4-digit binary number.

Same as luminous intensity.

Small particle on which water vapor condenses.

Same as river gauge.

A type of electrical thermometer in which the thermal element is a substance whose electrical resistance varies with the temperature. Such thermometers can be made with very short time constants and are capable of highly accurate measurements.

A standard unit of atmospheric pressure, defined as the pressure exerted by a 760 mm column of mercury at standard gravity (980.665 cm/sec2 ) at O

A hygrometer in which the sensitive element is a strand or strands of human hair, the length of which is a function of the relative humidity of the air.

Of or pertaining to the air, atmosphere, or aviation. Also, same as antenna.

A type of atmometer. It is a pan used in the measurement of the evaporation of water into the atmosphere. The NWS Class A pan is a cylindrical container 48 inches in diameter and 10 inches deep.