Until quite recently, most oceanographic research relating to the tidal variability in an estuary has ignored the effect of atmospherically forced motions on the tidal motions. Mechanisms exist, however, through which high frequency wind waves and low frequency subtidal variability can interact nonlinearly with the tide and modifiy the tidal response of an estuary significantly. A set of current and sea level observations in the upper Delaware Bay provides observational evidence which suggests that tidal variability in the interior of the bay was appreciably modified during two moderately strong atmospheric events. ¿American Geophysical Union 1990