The depth of water that would result from the melting of snow or ice, assuming measurement on a horizontal surface and no infiltration or evaporation.

The wind speed and direction at various levels in the atmosphere above the level reached by surface weather observations.

An absolute temperature scale with the degree of the Fahrenheit scale and the zero point of the Kelvin scale. The freezing point of water equals 491.69

The condition of the atmosphere when the amount of water vapor present is the maximum possible at the existing temperature.

Nested Grid Model generated every 12 hours by NCEP.

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

A motorlike device containing a rotor and a stator and capable of converting an angular position into an electrical signal, or an electrical signal into an angular position. When several synchros are correctly connected, all of the rotors will align thems ...

An instrument for recording global solar radiation.

A curve showing the variation of temperature with height in the free air. See lapse rate.

The lowest temperature that can be obtained on a wet-bulb thermometer in any given sample of air. Obtained by evaporation of water (or ice) from the muslin wick. Used in computing dew point and relative humidity.

A conically shaped, copper rain gauge shield.

Any device or instrument for measuring salinity, especially one based on electrical conductivity methods.

A series of Nansen-bottle water samples and associated temperature observations resulting from one release of a messenger.

An aneroid barometer arranged so that the deflection of the aneroid capsule actuates a pen which graphs a record on a rotating drum. Sometimes called aneroidograph.

In folklore, a name for wind.

A temperature telemeter.

The level at which ice crystals and snowflakes melt as they descend through the atmosphere.

A method of winds aloft observation accomplished by tracking a balloon-borne radar target or radiosonde with either radar or a radio theodolite.

The minimum temperature shown by a minimum thermometer exposed in an open situation with its bulb at the level of the tops of the grass blades of short turf.

The statement that the viscosity of air is independent of the density of air.