Thermometer used for measuring the lowest temperature attained during a given interval of time, for example, a day.

Anemometer which generates an electrical contact output with a frequency proportional to wind speed.

A type of electrical thermometer consisting of two thermocouples which are series-connected with a potentiometer and a constant-temperature bath. One couple, called the reference junction, is placed in a constant-temperature bath, while the other is used ...

An increase or amplification. There are two general usages of the term in radar meteorology: (a) antenna gain (or gain factor) is the ratio of the power transmitted along the beam axis to that of an isotropic radiator transmitting the same total power; an ...

An instrument that shows changes in humidity.

See radar theodolite, radio direction-finder.

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

A method of upper air observation consisting of an evaluation of the wind speed and direction, temperature, pressure, and humidity aloft by means of a balloon-borne radiosonde tracked by radar or a radio theodolite.

The rising of cold water from the deeper areas of the ocean to the surface. This phenomena often occurs along the California coast during the spring and summer.

Electromagnetic radiation lying in the wavelength interval between 0.8 micron and I millimeter. At the lower limit of this interval, the infrared radiation spectrum is bounded by visible radiation, while on its upper limit it is bounded by microwave radia ...

Name sometimes used in place of pyranometer as a generic term.

A unit of luminance or brightness equal to 1/d candles per foot'.

Same as atmometer.

A calorimetric radiation instrument of historic interest used for the measurement of outgoing heat radiation from the earth during an interval of time. The time integration is performed by allowing the radiation to fall on an uninsulated vessel containing ...

An evaluation of upper air temperature, pressure, and humidity from radio signals received from a balloon- borne radiosonde.

Generally, a measure of the departure of the mean daily temperature from a given standard, one degree day for each degree (

An instrument for measuring the difference between incoming and outgoing terrestrial radiation.

A system of designating meteorological observing stations by number. established and administered by the World Meteorological Organization. Under this scheme, specified areas of the word are divided into "blocks" each bearing a two-number designator. Stat ...

Temperarure at which a liquid solidifies under any given set of conditions. It may or may not be the same as the melting point or the more rigidly defined true freezing point or (for water) ice point.

A clockwise change in wind direction. Veering winds with height are indicative of warm air advection (WAA).