bucket rain gauge-A rain gauge where the precipitation collected by the receiver empties into one side of a chamber which is partioned transversely at its center and is balanced bistably upon a horizontal axis. When a predetermined amount of water has bee ...

Same as river gauge.

An increase in the central pressure of a pressure system; opposite of a deepening. More commonly applied to a low rather than a high.

Any horizontal wind velocity tangent to the contour line of a constant pressure surface (or to the isobar of a geopotential surface) at the point in question.

Anemometer which measures wind speed by measuring the degree of cooling of a metal film heated by an electric current. A type of cooling-power anemometer.

The interval between the lower and upper measuring limits of an instrument, i.e. a thermometer with a range of -35 to 50

One of several constant-pressure levels in the atmosphere for which a complete evaluation of data derived from upper air observations is required.

Nested Grid Model generated every 12 hours by NCEP.

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.

The amount of moisture which, if available, would be removed from a given land area by evapotranspiration. Expressed in units of water depth.

The temperature at which an object gives out as much radiation as it receives from its surroundings.

In general, any object that reflects incident energy. Usually it is a device designed for specific reflection characteristics.

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

Name given to the unit of pressure in the International System of Units (SI). Equal to 1 newton/meter2 or 0.01 millibar.

A unit of luminance (or brightness) equal to 1/6 candles per square centimeter.

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.

Any meteorological instrument, such as a radiosonde, in which the recording apparatus is located at some distance from the measuring apparatus.

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

Same as luminous intensity.

An approximation to the complete equations describing atmospheric motion in which only the terms most important for the growth and decay of synoptic scale extratropical weather systems (i.e., the large areas of high and low pressure seen on weather maps) ...