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 ...

A particular pattern of snow sampler having an internal diameter of 1.485 inches so that each inch of water in the sample weighs one ounce.

Determined by weighing a special type of wooden stick that has been exposed in the woods, its weight being proportional to its contained water.

A line drawn through geographical points having the same pluvial index.

Thermometer in which the difference in the rates of expansion with temperature of a liquid and its receptacle is used as a measure of the temperature. The liquid used may be ethyl alcohol, toluene, petroleum, or mercury.

Thermodynamic change of state of a system in which there is transfer of heat across the boundaries of the system. Compare to adiabatic process.

In general, solar radiation received at the earth's surface. Contracted from incoming solar radiation.

Read Only Memory. A memory that cannot be altered in normal use of a computer, Usually used to store information permanently, such as firmware programs.

An accumulation of granular ice tufts on the windward sides of exposed objects that is formed from supercooled fog or cloud and built out directly against the wind.

An instrument for measuring the frost point of the atmosphere.

Companion to the wet-bulb thermometer in a psychrometer. Used to measure ambient air temperature.

An anemometer which measures wind speed by means of the properties of wind-borne sound waves. It operates on the principle that the propagation velocity of a sound wave in a moving medium is equal to the velocity of sound with respect to the medium plus t ...

The meteorological visual range, which can be estimated from the average extinction coefficient using the Koschmieder equation.

For a given location, a measure of the long-range effectiveness of precipitation in promoting plant growth. Also called precipitation-evaporation index.

The process by which water in plants is transferred as water vapor to the atmosphere. Also, the amount of water so transferred.

Same as Aeolian.

Erasable Programmable Read Only Memory. Programable read-only memory which can be erased, usually by ultraviolet light, and re-programmed.

A direct-vision nephoscope constructed in the following manner: A grid-work of bars is mounted horizontally on the end of a vertical column and made free to rotate about the vertical axis. The observer rotates the grid and adjusts his or her position unti ...

A hygrometer which includes an arrangement for the time recording of atmospheric humidity.

A strong wind characterized by a sudden onset, a duration on the order of minutes, and a rather sudden decrease in speed.