In order to investigate the capability of Doppler Lidars in measuring lake breeze evolution over Lake Ontario and the Toronto area, an extensive field campaign was conducted during the 2015 Pan American and Parapan American Games. Two scanning Doppler Lidars were operated in constant elevation, constant azimuth, and vertically staring modes while the King City C-band Radar provided 5-min low-level scans. A special urban mesonet consisting of 55 surface sites was deployed to collect surface meteorological data and provide 1-min averages. The high-resolution version of the GEM (Global Environmental Multiscale) model in Limited Area Model mode was used to simulate the lake breeze flow with the horizontal spatial resolution of 0.25 km during the Games. This work will present comparisons of the observations and the simulations of lake breezes on several days. Preliminary results indicate that the high-resolution model is capable of reproducing the observed effects of strong lake breezes. The errors in modelled lake breeze timing, intensity and location will be discussed. The results can be used to improve the model forecast capabilities in the region.