See instrument error, observational error. random error, standard error, systematic error.

Pertaining to the action or effect of the wind. Derived from the name of the Greek god of the winds, Aeolus.

That part of snow melt that reaches stream channels as runoff.

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

A local variation of the wind vector or any of its components in a given direction.

An estimate of the temperature of an incandescent body, determined by observing the wavelength at which it is emitting with peak intensity (its color) and using that wavelength in Wien's law.

A wind blowing in a direction perpendicular to the course of a moving object.

A type of recording siphon barometer. The mechanically magnified motion of a float resting on the lower mercury surface is used to record atmospheric pressure on a rotating drum.

A unit of power equal to one joule per second or 10' ergs per second.

The temperature at which all three phases of a substance can exist in equilibrium. This temperature occurs at only one pressure. The triple-point of water is 273.16 K and is the basis of the Kelvin scale.

A balloon used to carry a radiosonde aloft, considerably larger than pilot balloons or ceiling balloons.

The difference between the input quantity applied to a measuring instrument and the output quantity indicated by the instrument. The inaccuracy of an instrument is equal to the sum of its instrument error and its uncertainty.

The correctable part of the inaccuracy of an instrument.

Same as humidity strip.

The writing component of a recording instrument.

An instrument for measuring the extinction coefficient in water.

Water vapor content of the air. See absolute humidity, dew point, mixing ratio, relative humidity, specific humidity.

A basic equation in night visual range theory, relating the illuminance of a point source of light to distance and the transmissivity of the atmosphere.

A sudden, significant increase in station pressure.

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