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From time to time, ERA-Interim exhibits spurious extreme values in some atmospheric fields, and ripple effects in related fields, as in the example below. The spurious values can have large magnitudes. Some examples:

The documented cases so far are:

  • 27 Sept 1980 at 00Z (1980-09-26 12:00 + Step12) in parameter mx2t (Maximum temperature at 2 metres since previous post-processing) at latitude -12.75, longitude 213.75, with mx2t = 343.1K
  • 28 June 2014 at 06Z  for SST analysis at surface level
  • 30 May 2016 at 12Z at the 1000 hPa level, and at 10m wind, at about 30N 148E in the Pacific east of Japan
  • 13 July 2016 at 0Z at the 700 hPa level, at about 20S 135E in central Australia

 

We suspect this issue to be caused by an error in the model or in the data assimilation. Unfortunately ECMWF do not have the resources to correct the problem and recreate the ERA-Interim data for the affected dates, so we can not offer a solution or workaround.


ERA-Interim production to stop on 31st August 2019

As ERA5 is now available (What are the changes from ERA-Interim to ERA5?), we are preparing to stop the production of ERA-Interim on 31st August 2019. This means that the complete span of ERA-Interim data will be from 1st January 1979 to 31st August 2019.

Keeping in mind that ERA-Interim is published with an offset of about three months from the dataset's reference date, ERA-Interim August 2019 data will be made available towards the end of 2019.

For the time being and until further notice, ERA-Interim shall continue to be accessible through the ECMWF Web API. ERA5 is available from the Climate Data Store (CDS).