Ground-based observations of the hydroxyl nightglow were made with a Fourier transform spectrometer from Haleakala, Maui during the ALOHA-90 campaign. Vibrational level populations and rotational temperature were obtained with a temporal resolution of 1 minute. Temperature precision was ¿1 K. Highly correlated in-phase variations in temperature and population were seen on all nights. However, a long term trend in the vibrational population was not reflected in the temperature. ¿American Geophysical Union 1991