Abbreviation for precipitation-evaporation ratio.

Same as water year.

A buoyant balloon kept from rising freely by means of a line secured to a point on the ground, as opposed to a free balloon. See kytoon.

The process by which one object becomes adhered to another by the binding action of ice.

See approximate absolute temperature scale, Celsius temperature scale, centigrade temperature scale, Fahrenheit temperature scale, Kelvin temperature scale, Rankine temperature scale, Reaumur temperature scale,

A type of disk hardness-gauge, especially useful in relatively soft snow. See disk hardness gauge.

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 ...

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

The audio-frequency signal transmitted by the Diamond-Hinman radiosonde when the baroswitch pen passes each fifteenth contact of the commutator, up to a number determined by the design of the commutator, and each fifth contact thereafter. This signal is t ...

A precipitation amount of less than 0.005 inches. Also, the record made by any self-registering instrument.

Thermometer used for measuring the lowest temperature attained during a given interval of time, for example, a day.

An instrument which indicates the presence of precipitation. The ombroscope consists of a heated, water-sensitive surface which indicates by mechanical or electrical techniques the occurrence of precipitation.

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

An evaluation of upper air temperature, pressure, and humidity from radio signals received from a balloon- borne radiosonde.

The correctable part of the inaccuracy of an instrument.

A measure of long-term precipitation effectiveness. The ratio of the normal annual rainfall to the normal annual evaporation.

An instrument for rapidly obtaining samples of airborne dust; a type of dust counter. Particles pass through a cylindrical chamber, are drawn at high velocity through a narrow slit, and then impinge upon a microscope cover glass located a short distance f ...

A device attached to a meteorological instrument to provide ventilation; usually a suction fan.

See sea-water thermometer, reversing thermometer.

For a given location, a measure of the long-range effectiveness of precipitation in promoting plant growth. Also called precipitation-evaporation index.