The effect of the Coriolis force and wind stress on hydrodynamic processes in Kamloops Lake during the development of the fall thermal bar is investigated using numerical simulation methods and meteorological data for December 1–30, 2017. It has been found that Coriolis forces in combination with strong winds that generate large-scale circulation flows of water masses have a significant impact on the alongshore flow velocity. The analysis of the spatial distributions of physical parameters showed that strong westerly winds directed opposite to the horizontal movement of the thermal front lead to a shift of the cyclonic circulation induced by the Coriolis force into the lower layers of the water column.