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

The difference between the solar radiation directed downward and upward; net flux of solar radiation.

The temperature to which a sample of air must be cooled, while the mixing ratio and barometric pressure remain constant, in order to attain saturation by water vapor. When this temperature is below O

Same as marine rainbow.

in folklore, a name for fire.

Operation mode of a communication circuit in which one end can only transmit and the other end can only receive.

Precipitation of white, opaque, spherical or conical ice particles that are crisp and easily crushed and that have diameters of 2 to 5 mm.

A type of directional antenna used on some types of radar and radio equipment consisting of an array of elemental, single- wire dipole antennas and reflectors.

A protocol similar to RS232 which makes use of differential transmission to provide high speed data transmission over significantly longer distances.

Any and all forms of water particles, liquid or solid, that fall from the atmosphere and reach the ground.

A general term to designate apparatus designed to observe the details of weather during thunderstorms.

An instrument, dropped from high attitude and carried by a stable parachute. used to measure the vertical component of turbulence aloft.

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

Atmospheric layer throughout which there is no change of temperature with height, i.e. a zero lapse rate.

A device that combines several separate communications signals into one and outputs them on a single line.

Same as humidity strip.

A hygrometer in which the sensitive element is a strand or strands of human hair, the length of which is a function of the relative humidity of the air.

The temperature at which the liquid and solid forms of a substance may exist in equilibrium at a given pressure (usually one standard atmosphere). The true freezing point of water is known as the ice point.

An instrument for measuring temperature by utilizing the variation of the physical properties of substances according to their thermal states. Thermometers may be classified into types according to their construction; deformation thermometer, electrical t ...

A liquid-in-glass or liquid-in-metal thermometer using mercury as the liquid.