Historical Variability and Lifecycles of North Atlantic Midlatitude Cyclones Originating in the Tropics

North Atlantic tropical and post-tropical cyclones impact midlatitude regions, but the inhomogeneous observational record of latter stages precludes many climatological analyses. The frequency tropical-origin storms basin-wide is projected to increase under anthropogenic climate change, so establishing confidence in our knowledge their historical variability lifecycles—against which model simulations may be evaluated—is important. We used a Lagrangian feature-tracking algorithm identify that impacted Northeast America Europe seven global reanalysis data sets, distinguishing systems retained warm-core structures or underwent warm seclusion from those extratropical transition, acquiring cold-core, frontal structures. Over last four decades, ?25% ?10% made landfall across Europe, respectively, as systems, with, on average, higher wind speeds than cold-core systems. Historical landfalls also exhibit distinct tracks, likely responding differing steering flow conditions.