Predictions from a wave-current interaction model based on a wave action balance equation are compared with measured surface wave modulations induced by internal waves. The comparison involves relative modulations of the surface wave spectrum at wavelengths ranging from 0.2 to 1.0 m for wind speeds of 3.5 and 7 m/s. Good agreement is found between measurements and predictions for interactions with eight internal waves in two wave packets encountered during the Synthetic Aperture Radar Internal Wave Signature Experiment. ¿ American Geophysical Union 1988