Spatiotemporal Characteristics and Intensity of Atlantic and Eastern North Pacific Concentric Eyewall Events

A 21-year (1997-2017) database of concentric eyewall events is developed by analyzing microwave satellite imagery, aircraft- and land-based radar, and published documents. Concentric eyewall events are identified in both the North Atlantic and eastern North Pacific basins. TCs are categorized as single (1 event), serial (>= 2 events) and super-serial (>= 3 events). Key findings include distinct spatial patterns for single and serial Atlantic TCs, a broad seasonal distribution for eastern North Pacific TCs, and apparent ENSO-related variability in both basins. The timing of concentric eyewall events is also analyzed relative to the occurrence of lifetime maximum intensity and episodes of rapid intensification (RI).