Changing file formats of Meteosat weather products


EUMETSAT broadcasts Meteosat meteorological products in LRIT format via EUMETCast.

The EUMETCast LRIT format does not conform to the WMO standard for GTS distribution and has a known limitation on product size.

In order to solve these two problems, we plan to replace the LRIT format with a WMO-compliant format in October 2022.

To help users transition to the new format, a parallel release period is planned and test data is provided.

Current planned schedule:

  • 19 July–19 October 2022: Parallel broadcast on EUMETCast of Meteosat meteorological products in the new WMO-compliant format.
  • October 20, 2022: Operational transition to WMO-compliant format. Meteosat weather products will no longer be available in the old LRIT format.

Test data, including three days of data in the old format and in the new format, is made available on our SFTP server:

The available dates are:

  • Met-8: September 16, 17 and 18
  • Met-10: September 21, 22 and 23
  • Met-11: September 25, 26 and 27

With this change, files distributed via EUMETCast will have the same format as those distributed via GTS.

The Meteosat weather product format description explains how to read and process products in the new format.

To note:

  • There will be no change in the scientific content of the products.
  • This format change will not affect the products archived in our Data Center.

The software changes required to replace the EUMETCast LRIT format involve another small change, which only affects the timestamp of AMV products distributed on the GTS. The product time reported in the header of each Meteosat weather product is identical to the timestamp in the product file name, with the exception of the AMV product for which there is currently a difference of 15 minutes (5 minutes for AMV RSS) between the product time and timestamp in the file name. The change will therefore consist of aligning the timestamp of the file name with the time of the product. The product time will remain unchanged.

Currently, AMV products distributed on the GTS have the following timestamps.

0° and IODC AMV products 0045, 0145, 0245, …, 2345
Product AMV RSS 0015, 0035, 0055, 0115, 0135, …, 2355

This will become:

0° and IODC AMV products 0030, 0130, 0230, …, 2330
Product AMV RSS 0010, 0030, 0050, 0110, 0130, …, 2350

This change will be operationally implemented on October 20, 2022. It only affects AMV products distributed on the GTS; AMV products distributed on EUMETCast already have a timestamp identical to the product time in the product header.

For more information, contact our user support service.


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