Temperature assumed by an unsaturated air parcel when brought adiabatically to a standard pressure (1,000 mb).

Very small precipitation drops (diameters less than 0.5 mm) that appear to float with air currents while falling in an irregular path. Unlike fog droplets, drizzle falls to the ground.

A type of cistern barometer in which the level of mercury in the cistern is adjusted to the zero point of the scale before each reading.

A hygrometer in which the rotation of the hygrometric element is a function of humidity.

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,

Diffuse solar radiation which has the same intensity in all directions.

Same as recording rain gauge.

A magnetometer of the electromagnetic type which is used to measure the horizontal intensity of the earth's magnetic field.

A warm, dry wind on the lee side of a mountain range, the warmth and dryness due to adiabatic compression upon descent.

The point (physical and/or electrical) where two distinct data processing elements meet.

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

See stage.

See constant-level balloon.

The scientific study of the waters of the earth, especially with relation to the effects of precipitation and evaporation upon the occurrence and character of water in streams, lakes, and on or below the land surface. In terms of the hydrologic cycle, the ...

A faintly-colored circular arc similar to a rainbow but formed on fog layers containing drops whose diameters are 100 microns or less. Also called mistbow, white rainbow.

Of equal or constant pressure, with respect to either space or time.

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

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 device for computing certain psychrometric data, usually the dew point and the relative humidity, from known values of the dry-bulb and wet-bulb temperatures and the atmospheric pressure. One type is the circular slide-rule form and, like the psychromet ...

An instrument for taking photographs of an image of the sun in monochromatic light.