Atmospheric Pressure | Surface Wind Velocity and Direction |
Atmospheric Humidity || Precipitation | Clouds | Special
Instruments | Weather Satellites | A. Pilot Balloon/Theodolite A
Pilot Balloon is a meteorological balloon that is filled with
gas lighter than air. When the pilot balloon is used in
conjunction with a theodolite it is used to determine the speed
and direction of winds at different levels of the atmosphere.
Radiosonde, an airborne instrument used for measuring pressure,
temperature and relative humidity in the upper air is the
radiosonde. he instrument is carried aloft by a meteorological
balloon inflated with hydrogen. The radiosonde has a built-in
high frequency transmitter that transmits data from the
radiosonde meter and recorded on the ground by a specially
designed radiosonde receiver. A more sophisticated version of
this instrument is the rawindsonde. The rawindsonde is an
electronic device used for measuring wind velocity, pressure,
temperature and humidity aloft. It is also attached t