A small, portable, tethered balloon system has been developed and proven by use in a variety of field programs by the Field Observing Facility of NCAR. A modernized version is now available. It can be operated by one person in wind speeds up to 10 m/s. It senses pressure, temperature, wet-bulb temperature, wind speed, and wind direction, and transmits data to the surface in a time multiplex format. Provision is made for other sensors, and a temperature structure function sensor has been used. The operational altitude for the system is nominally 750 m.

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1 The National Center for Atmospheric Research is sponsored by the National Science Foundation.