In November 1986, joint radar and Na lidar observations were conducted in Colorado to study mesopause dynamics. The radar observations were conducted at Platteville, Colorado with a Stratosphere Troposphere (ST) radar in a meteor echo detection mode. The Na lidar observations included ground-based observations at Broomfield and Denver, Colorado, and airborne observations during three flights over the Great Plains, Rocky Mountains, and Pacific Coast. Both radar and lidar identified a 6-hour wave that was remarkably coherent during the November campaign. The vertical wavelength of the 6-hour wave estimated from the radar data was 8 to 9 km, the amplitude of the zonal wind component was 10 m s-1, and the amplitude of the meridional wind component was 4 m s-1. The vertical wavelength estimated from the ground-based and airborne lidar data was 7.3 km, and the amplitude of the scalar horizontal wind ranged from 13 to 16 m s-1. The zonal wavelength of this wave was approximately 772 km, and the intrinsic zonal phase velocity was 35 m s-1 westward. The 6-hour wave was dominant in the height range of 80--90 km, which corresponds to the bottomside of the Na layer. An additional 2-hour wave was observed with the Na lidar during both the ground-based and airborne observations. The vertical wavelength of this wave was about 12 km, and the zonel wavelength was 260 km. The intrinsic zonal phase velocity was 43 m s-1 westward. This 2-hour wave was also present only on the bottomside of the Na layer. ¿ American Geophysical Union 1990