A chronograph used to make a time-record of certain measured meteorological elements. The most common type, the triple register, records wind direction and speed, duration of sunshine, and amount of rainfall (sensed respectively by a contact anemometer, M ...

Emission or transfer of energy in the form of electromagnetic waves or particles.

A general term for atmospheric water in any of its forms, i.e. clouds, fog, hail, ice crystals, rain.

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 ...

A scale of yellows, greens, and blues for recording the color of sea water, as seen against the white background of a Secchi disk.

An area of low barometric pressure, with its attendant system of winds. Also called a depression or cyclone.

The inaccuracy that the manufacturer permits when the unit is calibrated in the factory.

In meteorology, an area of low pressure; a low or trough.

A numbering system using a base number of 16 and including the ten decimal digits (0 to 9) along with six alpha digits (A to F). Thus. a digit is available to represent each of the possible values of a 4-bit binary digit.

A momentary decrease in the speed of the wind.

A numbering system using a base number of 16 and including the ten decimal digits (0 to 9) along with six alpha digits (A to F). Thus. a digit is available to represent each of the possible values of a 4-bit binary digit.

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

A conically shaped, copper rain gauge shield.

In general, the transformation of data from a "raw" form to some useable form. In meteorology, this often refers to the conversion of the observed value of an element to the value which it would theoretically have at some selected or standard level. The m ...

Abbreviation for radio frequency.

A pressure tube anemometer, consisting of a pitot tube mounted on the windward end of a wind vane and a suitable manometer to measure the developed pressure and calibrated in units of wind.

A graphical aid used in the reduction of data from a winds aloft observation.

Anemometer which measures wind speed by the speed of rotation of 3 or 4 hemispherical or conical cups, each fixed to the end of a horizontal arm projecting from a vertical axis. See condenser-discharge anemometer, contact anemometer. Compare to bridled-cu ...

Wind with a speed between 4 and 6 knots (4 and 7 mph), Beaufort scale number 2.

A severe weather condition characterized by low temperatures and strong winds bearing a great amount of snow, either falling or picked up from the ground.