Increasing sequential tropical cyclone hazards along the US East and Gulf coasts

Abstract Two tropical cyclones (TCs) that make landfall close together can induce sequential hazards to coastal areas. Here we investigate the change in TC historical and future projected climates. We find chance of has been increasing over past several decades at many US locations. Under high (moderate) emission scenario, from two TCs impacting same location within 15 days may substantially increase, with return period decreasing century 10–92 years ~1–2 (1–3) along East Gulf coasts, due sea-level rise storm climatology change. Climate also cause unprecedented compounding extreme regional level. A Katrina-like a Harvey-like United States each other, which is non-existent control simulation for 1,000 years, have an annual occurrence probability more than 1% by end under scenario.