Abstract
An experimeatal method and analytical procedures which allow a captive balloon to be used as an instrument support for wind and other meteorological measurements above an urban area have been developed, and their use to make measurements of the average wind speed and temperature at heights up to 1000 ft at two urban sites is described. The relationship which was obtained between velocity profile index and lapse rate and the value of the adiabatic profile index are compared with earlier measurements in urban areas. The measurements showed a value of the index of 0.21 for conditions of dry adiabatic lapse rate and gave confirmation of the slow rate of growth of the urban boundary layer.
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