Snow gauge composed of a metal cylinder, closed at one end, used to obtain a sample of snow from which the water is measured after melting.

In general, any self-recording instrument carried aloft by any means to obtain meteorological data.

A number of quantity defining a limit that errors will not exceed when a device is used under specified operating conditions. Accuracy rating can be expressed in a number of forms, i.e. in terms of the measured variable (+/- 1 C), percent of span (+/-0.5% ...

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 ...

Wind with a speed between 7 and 10 knots (8 and 12 mph), Beaufort scale number 3.

The total amount of water transferred to the atmosphere by evapotranspiration.

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 ...

Same as contact anemometer.

The outer, solid portion of the earth: the crust of the earth.

The number of cycles per second between the limits of a frequency band.

A recording anemoclinometer.

A rain gauge which indicates but does not record the amount of precipitation captured.

A mercury-in-glass thermometer which records the temperature upon being inverted and retains its reading until being returned to the first position.

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.

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 ...

Water condensed onto objects at or near the ground, due to the fact that their temperatures have fallen below the dew point temperature of the surrounding air, but not below freezing.

A pyrheliometer of the thermoelectric type. Radiation is allowed to fall on two concentric silver rings, the outer covered with magnesium oxide and the inner covered with lamp black. A system of thermocouples (thermopile) is used to measure the temperatur ...

See radiosonde commutator.

Of or pertaining to the air, atmosphere, or aviation. Also, same as antenna.

The processing of the form or mode of a signal so as to make it intelligible to, or compatible with, a given device.