Sandy beaches and barrier systems are the natural first line of defence against storms as these geomorphic features protect surrounding coastal areas that are often highly populated and support diverse ecosystems. Atlantic Canada has recently been impacted by intense cyclonic storms, such as Hurricane Fiona in 2022 and Hurricane Erin in 2025, that cause storm surges and large waves that can flood low-lying areas and drive morphological change. This study combines an expansive field dataset with numerical modelling to investigate the hydrodynamic and morphologic response of a beach-dune system in response to storms. Located on the Atlantic coast of Nova Scotia, Martinique Beach is a 3.5 km long high-energy barrier beach that spans a wide estuary and is an ideal site for coastal observations. In 2025, the site was instrumented with a series of real-time wave buoys, bottom-mounted pressure sensors, a current sensor, and groundwater loggers buried in the beach to monitor interacting wave, surge, tide, and groundwater conditions at the site. In addition, beach surveys were conducted using drone-mounted LiDAR and ground-based differential GPS surveys. Observations from Hurricanes Erin and Melissa (fall 2025) were used to drive and validate XBeach, a nearshore hydrodynamic and morphodynamic model, to investigate dynamics of the storm surge and surface waves that drove beach erosion. The model was also forced with a variety of hypothetical incident wave parameters and water levels to indicate the range of morphological responses to possible future storm events.