The predictability of coastal flooding has significant implications for communities along the U.S. and U.K. coasts. In Boston, for instance, the bimodal daily distribution of flood peaks coincides with business hours and nighttime, potentially exacerbating societal impacts. Regions with high tidal dominance, such as the U.S. West Coast and parts of the U.K., experience stronger clustering of flood events, making them more predictable. However, areas with low tidal dominance, such as the Gulf Coast, exhibit less regularity due to the influence of diurnal tides and tropical cyclones. Understanding these patterns is crucial for improving flood preparedness and mitigating risks to infrastructure and public safety.