Sudden stratospheric warming (SSW) events are the most prominent processes, during which the troposphere and stratosphere demonstrate the dynamical coupling. We investigate interactions between stationary orographic gravity waves (OGWs) and planetary waves during winter and spring months in the Northern Hemisphere, when SSWs frequently occur. A parameterization of dynamical and thermal effects of OGWs generated by the Earth’s surface topography has been developed. This parameterization was included into the numerical model of general circulation of the middle and upper atmosphere (MUAM). Influence of OGWs on the mean flow and planetary waves in the troposphere and stratosphere during the SSW is analyzed.