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

Eluding precise prediction, completely irregular.

A general term for instruments which sample atmospheric suspensoids by impaction. Same as impactometer.

Apparatus consisting of (a) standard radiosonde and radiosonde ground equipment to obtain upper-air data on pressure, temperature, and humidity, and (b) a self-tracking radio direction-finder to provide the elevation and azimuth angles of the radiosonde s ...

A type of hygrometer which measures the water vapor content of the atmosphere by means of the absorption of vapor by a hygroscopic chemical.

One of several constant-pressure levels in the atmosphere for which a complete evaluation of data derived from upper air observations is required.

Defect in the action of an aneroid barometer resulting in a sluggish adjustment of the index toward the correct reading when the barometer is subjected to a large and rapid change in pressure.

The ratios, to the mean wind speed, of the average magnitudes of the component fluctuations of the wind along three mutually perpendicular axes.

The record made by a hygrograph.

See ceilometer.

General term for an instrument used to make direct measurements of visual range or measurements of the physical characteristics of the atmosphere which determine the visible range.

A weakly colored lunar halo identical in form and optical origin to the solar parhelion.

An instrument which measures the transmissivity of the atmosphere between two points for the determination of visual range.

A river gauge in which a weight suspended on a wire is lowered to the water surface from a bridge or other overhead structure to measure the distance from a point of known elevation to the water surface.

The direction from which the wind is blowing, measured in points of the compass or in azimuth degrees.

A protocol similar to RS232 which permits data interchange on multidrop networks of up to 32 nodes using a single twisted pair cable. In order for this protocol to be used, each device on a network must have some level of intelligence in order establish o ...

National Weather Service. Administered by the U.S. Department of Commerce.

Contraction for radiosonde observation.

By international agreement, a period during which greatly increased observation of world-wide geophysical phenomena is undertaken through the co-operative effort of participating nations. July 1957-December 1958 was the first such year. However, precedent ...

A graphical representation of a frequency distribution. The range of the variable is divided into class intervals for which the frequency of occurrence is represented by a rectangular column. The height of the column is proportional to the frequency of ob ...