Recent work has revealed a weakening of North Pacific bomb cyclones since the early 2000s, closely associated with the variability of the Aleutian Low. However, most existing analyses are limited to the satellite era, making it difficult to determine whether these changes represent an unprecedented shift or part of longer-term climate variability. In this study, we extend the historical record of North Pacific bomb cyclones to 1940 using the ERA5 reanalysis. Bomb cyclones are identified and tracked using an objective cyclone-tracking algorithm based on mean sea-level pressure. Multiple intensity metrics, including maximum near-surface wind speed, minimum sea-level pressure, and the deepening rate of cyclone center pressure, are examined. The extended record enables an assessment of interannual-to-multidecadal variability in bomb cyclone intensity over the past eight decades. Preliminary analyses suggest substantial multi-decadal modulation of bomb cyclone intensity. In addition, particular attention is given to the relationships between bomb cyclone characteristics and large-scale Pacific climate modes, including the Pacific Decadal Oscillation, Interdecadal Pacific Oscillation, and Aleutian Low variability. These results help clarify the relative contributions of natural climate variability and long-term climate change to North Pacific bomb cyclone behavior.