An instrument for measuring the relative speed of a fluid. It consists of a concentric pipe arrangement in which the inner pipe is open at one end and the outer pipe is perforated and closed at both ends. Each pipe is connected to a manometer. The unit is ...

A wind blowing in a direction perpendicular to the course of a moving object.

Difference between the temperatures of the dry-bulb and the wet-bulb thermometers of a psychrometer.

A cover which fits over a large inflated balloon to facilitate handling in high or gusty winds.

A unit of luminance or brightness equal to 1/d candles per foot'.

A wind scale adapted by the U.S. Forest Service for use in the forested areas of the northern Rocky Mountains (NRM). It is an adaptation of the Beaufort wind scale. The difference between these two scales lies in the specification of the visual effects of ...

A recording pressure-tube anemometer in which the wind scale of the float manometer has been made linear by the use of springs, i.e. Dines anemometer.

A constant which describes the performance of a wind vane in response to a step change in wind direction. It is calculated from the relative amount of overshoot on two successive swings (half cycles) of a decaying oscillation. This specification is dimens ...

In a radiosonde observation, a level (other than a standard level) for which values of pressure, temperature, and humidity are reported because temperature and/or humidity data at that level is sufficiently important or unusual to warrant the attention of ...

A flower-like diagram indicating the relative frequencies of different wind directions for a given station and period of time.

A set of electrical conductors, often on a backplane, that carry data and power signals among the various components of a computer.

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

An instrument which automatically records the measurement of two or more meteorological elements.

The lowest value of a measured quality at which a sensor responds. Compare to tracking.

A line of equal or constant pressure.

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 line drawn through geographical points having the same pluvial index.

A type of electrical thermometer consisting of two thermocouples which are series-connected with a potentiometer and a constant-temperature bath. One couple, called the reference junction, is placed in a constant-temperature bath, while the other is used ...

The height ascribed to the lowest layer of clouds or obscuring phenomena when it is reported as broken, overcast, or obscuration and not classified as "thin" or "partial." The ceiling is termed unlimited when these conditions are not satisfied. ...

Any horizontal wind velocity tangent to the contour line of a constant pressure surface (or to the isobar of a geopotential surface) at the point in question.