Data Notice: NCEP/NCAR Reanalysis 1 updates to end

The National Weather Service's National Centers for Environmental Prediction (NCEP) Central Operations has announced that the Climate Data Assimilation System (CDAS) will be discontinued in favor of the Conventional Observation Reanalysis ( CORe) effective on or about March 9, 2026.

What this means

Because of this change, PSL will no longer be able to update NCEP/NCAR Reanalysis 1 starting around March 9, 2026, The exact date is pending the discontinuation of CDAS by the National Weather Service.

The historical NCEP/NCAR Reanalysis 1 data will remain available on our site.

We are in the process of identifying other products that may no longer be able to be updated or will require a suitable alternative to CDAS to continue operating.

Please note: PSL does not have immediate plans to make the COREe datasets available through our site. Information on the CORe dataset, including access instructions, has been compiled on this NOAA CORe Information page as a service to our users.

For more information

For points of contact about this data change, visit the NWS CDAS to COREe Service Change Notice ( PDF, 47 KB). For additional National Weather Service service changes, go to the National Service Change Notices and Public Statements page.

For questions about PSL data and products, email psl.data@noaa.gov.