Wind with a speed between 48 and 55 knots (55 and 63 mph), Beaufort scale number 10.

A type of hygrometer which measures the water vapor content of the atmosphere by means of the absorption of vapor by a hygroscopic chemical.

Fine dust or salt particles dispersed through a portion of the atmosphere; a type of lithometer. The particles are so small they cannot be felt or seen with the naked eye. Many haze formations are caused by the presence of an abundance of condensation nuc ...

In general, the transformation of data from a "raw" form to some useable form. In meteorology, this often refers to the conversion of the observed value of an element to the value which it would theoretically have at some selected or standard level. The m ...

A special form of the aspiration psychrometer. developed by Assmann, in which the thermometric elements are well shielded from radiation. Psychrometric measurements may be taken with the instrument in the presence of direct solar radiation.

Particle on which the freezing of water occurs.

A line drawn through all points on a map having the same amount of cloudiness.

An instrument which automatically records the voltage applied to it, as a function of time.

A graphical representation of stage or discharge at a point on a stream as a function of time.

Rate of wind movement in distance per unit time.

The correction applied to an instrument to account for the effect of temperature upon its response characteristics.

A thermometer whose sensitive element has been made to resemble a black body by covering it with lamp black. The thermometer is placed in an evacuated transparent chamber which is maintained at a constant temperature. The instrument responds to insolation ...

A device that allows a terminal or computer at one location to communicate with a terminal or computer at a distant location via wire or phone lines.

An instrument which indicates the presence of dust particles in the atmosphere. Also spelled coniscope.

A conically shaped, copper rain gauge shield.

Abbreviation for visual flight rules, but commonly used to refer to the relatively favorable weather and/or flight conditions to which these rules apply.

An instrument for measuring the difference of the solar radiation falling on both sides of a horizontal surface from the whole hemisphere.

The attenuation of light.

The ratio of the existing amount of water vapor in the air at a given temperature to the maximum amount that could exist at that temperature. Usually expressed in percent.

The actual time during which physical events take place.