Wind with a speed between 17 and 21 knots (19 and 24 mph); Beaufort scale number 5.

The meteorological visual range, which can be estimated from the average extinction coefficient using the Koschmieder equation.

A hygrometer based upon the diffusion of water vapor through a porous membrane.

A c.g.s. (centimeter-gram-second) unit of mass. Originally defined as the mass of 1 cubic centimeter of water at 4

An anemometer which measures wind speed by means of the properties of wind-borne sound waves. It operates on the principle that the propagation velocity of a sound wave in a moving medium is equal to the velocity of sound with respect to the medium plus t ...

The process by which water in plants is transferred as water vapor to the atmosphere. Also, the amount of water so transferred.

A strong wind characterized by a sudden onset, a duration on the order of minutes, and a rather sudden decrease in speed.

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

An evaporation pan in which the evaporation is measured from water in a pan floating in a larger body of water.

A rocket designed primarily for routine upper air observations in the lower 250,000 feet of the atmosphere, especially that portion inaccessible to balloons (above 100,000 feet).

A mercury barometer of the fixed cistern type in which a moveable scale terminating in an ivory point is used to compensate for the variations in the height of the mercury in the cistern

The outer, solid portion of the earth: the crust of the earth.

Precipitation of white, opaque, spherical or conical ice particles that are crisp and easily crushed and that have diameters of 2 to 5 mm.

The quantity to be measured (or modulated, or detected, or operated upon) which is received by an instrument. Thus, for a thermometer. temperature is the input quantity.

A clay atmometer consisting of a hollow ceramic sphere through which evaporation occurs. Evaporation is measured by the loss of water from the reservoir which feeds the sphere.

Instrument for measuring the mean intensity of glo global solar radiation (direct and diffuse) near the earth's surface in a specified time interval.

The value of the quantity measured, as indicated or otherwise provided by a measuring instrument.

A set of weekly colored rainbow arcs sometimes discernable inside a primary rainbow.

A unit of distance equal to 5280 feet. It is sometimes referred to as a land mile.

Abbreviation for radio frequency.