Same as altimeter setting.

The record made by a hygrograph.

An ice coating with a consistency intermediate between glaze and rime.

An instrument for determining the direction from which radio waves approach a receiver. It may consist of a manually operated direction indicator, or it may use a servo system to position the antenna automatically in the direction of the incident waves. T ...

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

A remote indicator for wind speed and direction used in conjunction with a contact anemometer and a wind vane. The indicator consists of a center light, connected to the contact anemometer, surrounded by eight equally spaced lights which are individually ...

Solar radiation scattered by particles in the atmosphere.

Abbreviation for precipitation-evaporation ratio.

A liquid-in-metal thermometer in which mercury is enclosed in a steel envelope. The change in internal pressure caused by the temperature variation is measured by a Bourdon tube which is connected to the mercury by a capillary tube. This instrument is hig ...

A photometric unit of illuminance or illumination equal to one lumen per square centimeter.

In general. the severe wind of an intense tropical cyclone (hurricane or typhoon). The term has no further technical connotation, but, unfortunately, is easily conftlsed with the strictly defined hurricane-force wind,

The difference between the air temperature and the dew-point. Also called dew-point deficit, dew-point depression.

A counterclockwise change in wind direction. Backing winds with height are indicative of cold air advection (CAA).

A device for measuring the river stage. Also called stream gauge.

A reversing thermometer which is encased in a strong glass outer shell that protects it against hydrostatic pressure. Compare to unprotected thermometer.

The state of the weather with respect to its effect upon the kindling and spreading of forest fires.

A common type of liquid-inglass thermometer, used, in meteorology, in psychrometers and as a maximum thermometer.

The maximum positive and negative deviation observed in testing a device under specified conditions and by a specified procedure. It is usually measured as an inaccuracy and expressed as accuracy, typically in terms of the measured variable, percent of sp ...

The atmospheric pressure at mean sea level either directly measured by stations at sea level or empirically determined from the station pressure and temperature by stations not at sea level. Used as a common reference for analyses of surface pressure patt ...

The water portion of the earth as distinguished from the solid part, called the lithosphere, and from the gaseous outer envelope, called the atmosphere.