ERA5 hourly data on pressure levels from 1940 to present H. Hersbach et al. https://doi.org/10.24381/cds.bd0915c6

Data for "A New Year-Round Weather Regime Classification for North America" S. H. Lee et al. https://zenodo.org/records/8165165

Data for "Stratospheric Downward Wave Reflection Events Modulate North American Weather Regimes and Cold Spells" S. H. Lee et al. https://zenodo.org/records/10839643

Space-time spectra of Northern Hemispheric Rossby waves at tropospheric and stratospheric levels during extended winter J. Riboldi and M. Schutte https://doi.org/10.57804/1dne-qk60