A captive balloon used to maintain meteorological equipment aloft at approximately a constant height. The kytoon is streamlined and combines the aerodynamic properties of a balloon and a kite.

A thermograph in which ventilation is provided by a suction fan.

The downward flux of atmospheric radiation passing through a given level surface, usually taken as the earth's surface. This result of infrared (long-wave) absorption and reemission by the atmosphere is the principal factor in the greenhouse effect.

The maximum difference in output for any given input (within the specified range) when the value is approached first with increasing, and then with decreasing, input signals. Caused by energy absorption in the elements of the measuring instrument. Usually ...

February 2nd. In American folklore, a day that is popularly supposed to provide the key to the weather for the remainder of the winter. Specifically, if the ground-hog upon emerging from its hole casts a shadow, it will return underground, thereby forebod ...

A thermometer with a muslin-covered bulb which is moistened. used to measure wet-bulb temperature.

Random Access Memory. The memory of a computer which can be read and written into at any location without passing through preceding locations.

A definite portion of a stream channel, commonly taken between two gauging stations, but may be taken between any two specified points.

The time required for an instrument to registe 63.2% of a step change in the variable being measured.

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

Name applied to a class of instruments which measure the liquid content of the atmosphere.

Negative Vorticity Advection.

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

The change in the measured transducer output caused by changes in ambient temperature. Usually expressed a percentage of full scale.

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

A transducer which converts electromagnetic radiation in the infrared, visible, and ultraviolet regions into electrical quantities such as voltage, current, or resistance. Also called photo cell.

The closeness of agreement among measurements of the same value of the same quantity where the individual measurements are made under different defined conditions, i.e. by different methods or with different measuring instruments.

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

A conically shaped, copper rain gauge shield.

Navy Operational Global Atmospheric Prediction System. A global meteorological model operated by the Department of Defense.