Radiation with wavelengths greater than 4 microns. (In meteorology, same as infrared radiation.)

Same as fogbow.

Dihydrogen oxide, molecular formula H2O.

The pressure unit of the meter-ton-second system of physical units. equal to 10 millibars or 101 dynes per cm2.

A recording hair hygrometer.

Video Display Terminal. An input and display device which includes a keyboard and a screen and allows a human to communicate with a computer.

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 nautical mile is closely related to the geographical mile which is defined as the length of one minute of arc on the earth's equator. By international agreement, the nautical mile is now defined as 1852 meters.

A measure, proposed by Angstrom, of the precipitation effectiveness of a region.

A sunshine recorder of the type in which the time scale is supplied by the motion of the sun. It consists essentially of a spherical lens which bums an image of the sun upon a specialty prepared card.

An instrument for rapidly obtaining samples of airborne dust; a type of dust counter. Particles pass through a cylindrical chamber, are drawn at high velocity through a narrow slit, and then impinge upon a microscope cover glass located a short distance f ...

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

The actual lifting force of an inflated balloon, usually expressed in grams.

A small pointer extending downward from the top of the cistern of a Fortin barometer. The level of the mercury in the cistern is adjusted so that it just comes in contact with the end of the pointer, thus setting the zero of the barometric scale.

A device for measuring the frequency of occurrence of atmospherics whose intensity is greater than a predetermined level.

The direction toward which the wind is blowing; with the wind.

Force wind-Wind with a speed above 64 knots (73 mph); Beaufort scale numbers 12 through 17.

The change in barometric pressure within a specified period of time (typically 3 hours for meteorological observations).

A unit of heat originally defined as the amount of heat required to raise the temperature of water through one degree centigrade (the gram-calorie or small calorie), but this proved to be insufficiently precise. The 15

The transmission of data collected at a remote location over communications channels to a central station.