"Read & learn About Pibals"
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Pibal An acronym for pilot-balloon observation. A method of winds aloft observation; that is, the determination of wind speeds and directions in the atmosphere above a station.
PIBAL
Pilot balloon. A small helium-filled meteorological balloon that is tracked as it rises through the atmosphere to determine how wind speed and direction change with altitude.
Pilot Balloon ...
pilot balloon (pibal)
A balloon that ascends through the atmosphere at a constant rate and is tracked by a theodolite in order to obtain timed data for the computation of the wind speed and wind direction at various levels in the upper air ...
THEODOLITE An optical instrument used to track the motion of a pilot balloon, or pibal, by measuring the elevation and azimuth angles.
Pibal Contraction for pilot balloon observation. Piche evaporimeter An atmometer which uses a filter paper disc as the evaporating element. The amount of water evaporated through the paper is read at the graduated tube reservoir.
On the opposite side of the cabinet is space to store balloons, string and pibal lights. The gas used to fill the balloon is usually helium but can also be hydrogen.
pilot balloon observation (commonly called PIBAL)—A method of winds-aloft observation by visually tracking a pilot balloon.
For example, in upper air measurements and observations "rabals" (radiosonde balloons), "pibals" (pilot balloons), and "pireps" (pilot reports) are used to determine the strength and direction of winds aloft.
PILOT BALLOON A small balloon whose ascent is used to determine the direction and speed of low level atmospheric winds. Also known as a pibal.
 See also: Weather, Pilot balloon, Temperature, Meteor, Radar
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