The Reanalysis for the Global Ensemble Forecast System, Version 12 Journal Article uri icon



  • Abstract; NOAA has created a global reanalysis dataset, intended primarily for initialization of reforecasts for its Global Ensemble Forecast System, version 12 (GEFSv12), which provides ensemble forecasts out to +35-days lead time. The reanalysis covers the period 2000–19. It assimilates most of the observations that were assimilated into the operational data assimilation system used for initializing global predictions. These include a variety of conventional data, infrared and microwave radiances, global positioning system radio occultations, and more. The reanalysis quality is generally superior to that from NOAA’s previous-generation Climate Forecast System Reanalysis (CFSR), demonstrated in the fit of short-term forecasts to the observations and in the skill of 5-day deterministic forecasts initialized from CFSR versus GEFSv12. Skills of reforecasts initialized from the new reanalyses are similar but slightly lower than skills initialized from a preoperational version of the real-time data assimilation system conducted at the higher, operational resolution. Control member reanalysis data on vertical pressure levels are made publicly available.

publication date

  • January 1, 2022

has restriction

  • bronze

Date in CU Experts

  • June 25, 2022 3:44 AM

Full Author List

  • Hamill TM; Whitaker JS; Shlyaeva A; Bates G; Fredrick S; Pegion P; Sinsky E; Zhu Y; Tallapragada V; Guan H

author count

  • 12

Other Profiles

International Standard Serial Number (ISSN)

  • 0027-0644

Electronic International Standard Serial Number (EISSN)

  • 1520-0493

Additional Document Info

start page

  • 59

end page

  • 79


  • 150


  • 1