The manuscript at hand presents a Bayesian approach to the updating of vulnerability functions for the rapid forecasting of natural catastrophe damage. Based on social media, the authors demonstrate the adaptation of generic vulnerability functions to Hurricane Dorian. The manuscript is well written and describes the novel approach in great clarity. The presented framework is highly relevant, in particular for practitioners in the field. With a strong deviation in terms of damage estimates, the results of the analysis provide a good argument for further C1 NHESSD