Meteorological conditions in Windsor,Ontario during the passage of a ridge of high pressure

The construction of an acoustic echo Sounding unit composed of a shielded parabolic reflector type of antenna and a suitable receiving system is described. Echo soundings obtained at the antenna site at the University of Toronto in downtown Toronto are presented indicating that sound scattered from temperature fluctuations in the atmosphere up to 350 m above the antenna site can be detected, even during the high background noise levels associated with rush hour traffic.