# \#ifs **URL:** https://forum.ecmwf.int/tag/ifs/84.md [Latest](https://forum.ecmwf.int/latest.md) · [Categories](https://forum.ecmwf.int/categories.md) · [Tags](https://forum.ecmwf.int/tags.md) --- ## [Possible inconsistency in stormIdentifier assignment in operational tropical cyclone BUFR products (IFS and AIFS-ENS)](https://forum.ecmwf.int/t/possible-inconsistency-in-stormidentifier-assignment-in-operational-tropical-cyclone-bufr-products-ifs-and-aifs-ens/15171)
**Author:** [@Kotaro\_Takahashi](https://forum.ecmwf.int/u/Kotaro_Takahashi)\ **Replies:** 2\ **Last updated:** [30 July 2026 07:13 UTC](https://forum.ecmwf.int/t/possible-inconsistency-in-stormidentifier-assignment-in-operational-tropical-cyclone-bufr-products-ifs-and-aifs-ens/15171 "2026-07-30T07:13:05Z")
Hello, I have found what appears to be an inconsistency in the stormIdentifier field of the operational tropical cyclone BUFR products. I examined both the IFS and AIFS-ENS TC BUFR files from the ECMWF Open Data S3 buc… --- ## [IFS Cycle 50r1 and AIFS v2 - Implementation planned for 12 May 2026](https://forum.ecmwf.int/t/ifs-cycle-50r1-and-aifs-v2-implementation-planned-for-12-may-2026/14781)
**Author:** [@Milana\_Vuckovic](https://forum.ecmwf.int/u/Milana_Vuckovic)\ **Replies:** 22\ **Last updated:** [22 May 2026 15:32 UTC](https://forum.ecmwf.int/t/ifs-cycle-50r1-and-aifs-v2-implementation-planned-for-12-may-2026/14781 "2026-05-22T15:32:21Z")
We are pleased to confirm that good progress is being made towards the joint operational implementation of IFS Cycle 50r1, AIFS Single v2 and AIFS ENS v2, and the implementation is planned for 12 May 2026. The date will … --- ## [ECMWF Open Data Store slow since the 50vr1 upgrade](https://forum.ecmwf.int/t/ecmwf-open-data-store-slow-since-the-50vr1-upgrade/14973)
**Author:** [@Ross\_Ursino](https://forum.ecmwf.int/u/Ross_Ursino)\ **Replies:** 12\ **Last updated:** [20 May 2026 17:29 UTC](https://forum.ecmwf.int/t/ecmwf-open-data-store-slow-since-the-50vr1-upgrade/14973 "2026-05-20T17:29:48Z")
Hello, I’m just wondering if anyone else has also noticed that downloading IFS data directly from the ECMWF Data Store has been extremely slow ever since the v50r1 upgrade occurred on the 12th of May? I have continuall… --- ## [Confirmation: IFS Cycle 50r1 and AIFS v2 - Joint implementation on 12 May 2026](https://forum.ecmwf.int/t/confirmation-ifs-cycle-50r1-and-aifs-v2-joint-implementation-on-12-may-2026/14937)
**Author:** [@Milana\_Vuckovic](https://forum.ecmwf.int/u/Milana_Vuckovic)\ **Replies:** 0\ **Last updated:** [6 May 2026 07:06 UTC](https://forum.ecmwf.int/t/confirmation-ifs-cycle-50r1-and-aifs-v2-joint-implementation-on-12-may-2026/14937 "2026-05-06T07:06:16Z")
We are pleased to confirm the operational implementation of IFS Cycle 50r1, including numerical weather prediction and atmospheric composition (CAMS), as well as AIFS Single v2 and AIFS Ensemble v2 with the 06 UTC run … --- ## [IFS Cycle 50r1 enters the Release Candidate Phase](https://forum.ecmwf.int/t/ifs-cycle-50r1-enters-the-release-candidate-phase/14736)
**Author:** [@Milana\_Vuckovic](https://forum.ecmwf.int/u/Milana_Vuckovic)\ **Replies:** 0\ **Last updated:** [20 February 2026 14:17 UTC](https://forum.ecmwf.int/t/ifs-cycle-50r1-enters-the-release-candidate-phase/14736 "2026-02-20T14:17:34Z")
We are pleased to confirm that good progress is being made with the forthcoming implementation of IFS Cycle 50r1 in operations, and it has now entered the Release Candidate test phase (RCP). Forecast production using th… --- ## [Upcoming IFS and AIFS changes with user impacts](https://forum.ecmwf.int/t/upcoming-ifs-and-aifs-changes-with-user-impacts/14637)
**Author:** [@Michela](https://forum.ecmwf.int/u/Michela)\ **Replies:** 2\ **Last updated:** [12 February 2026 19:43 UTC](https://forum.ecmwf.int/t/upcoming-ifs-and-aifs-changes-with-user-impacts/14637 "2026-02-12T19:43:41Z")
2026 will be a big year for ECMWF, with two IFS model cycle upgrades (50r1 and 50r2) and the update of both AIFS Single and AIFS Ensemble. The test data for IFS Cycle 50r1 is expected to be released very soon, and we en… --- ## [ECMWF at AMS 2026](https://forum.ecmwf.int/t/ecmwf-at-ams-2026/14636)
**Author:** [@Michela](https://forum.ecmwf.int/u/Michela)\ **Replies:** 0\ **Last updated:** [23 January 2026 14:00 UTC](https://forum.ecmwf.int/t/ecmwf-at-ams-2026/14636 "2026-01-23T14:00:11Z")
ECMWF colleagues, Emma Pidduck, Cihan Sahin, Jakob Schloer and Baudouin Raoult, will be attending AMS 2026 in person in Houston, Texas from 23-29 January 2026. Together we can cover topics including ECMWF products and s… --- ## [Spherical coordinates of ERA5 model level data](https://forum.ecmwf.int/t/spherical-coordinates-of-era5-model-level-data/14580)
**Author:** [@Tobias\_Gerken](https://forum.ecmwf.int/u/Tobias_Gerken)\ **Replies:** 0\ **Last updated:** [8 January 2026 09:30 UTC](https://forum.ecmwf.int/t/spherical-coordinates-of-era5-model-level-data/14580 "2026-01-08T09:30:15Z")
Hello, I am comparing ERA5 model level data to radiosondes at specific lat-lon coordinates and have a question about the associated Earth model in the dataset. The dataset I am working with has the following attribute … --- ## [IFS Cycle 50r1 Release Candidate Phase](https://forum.ecmwf.int/t/ifs-cycle-50r1-release-candidate-phase/14475)
**Author:** [@Michela](https://forum.ecmwf.int/u/Michela)\ **Replies:** 0\ **Last updated:** [5 December 2025 09:25 UTC](https://forum.ecmwf.int/t/ifs-cycle-50r1-release-candidate-phase/14475 "2025-12-05T09:25:16Z")
The introduction of the Release Candidate Phase (RCP) for IFS Cycle 50r1 is planned for January 2026. From January 2026, Cycle 50r1 forecast production will run in parallel with the operational system, giving users time… --- ## [New Parameters Coming to ECMWF Open Data](https://forum.ecmwf.int/t/new-parameters-coming-to-ecmwf-open-data/14218)
**Author:** [@Michela](https://forum.ecmwf.int/u/Michela)\ **Replies:** 0\ **Last updated:** [20 November 2025 14:00 UTC](https://forum.ecmwf.int/t/new-parameters-coming-to-ecmwf-open-data/14218 "2025-11-20T14:00:19Z")
We are pleased to announce that on Thursday 20th November, ECMWF will add new parameters to its Open Data offering. The following parameters will become available: ENS CTRL (ex-HRES) and 50 perturbed members: Snowfal… --- ## [Valid date range to retrieve IFS forecasts from ECMWF open-data](https://forum.ecmwf.int/t/valid-date-range-to-retrieve-ifs-forecasts-from-ecmwf-open-data/14225)
**Author:** [@Cynthia](https://forum.ecmwf.int/u/Cynthia)\ **Replies:** 1\ **Last updated:** [2 October 2025 19:56 UTC](https://forum.ecmwf.int/t/valid-date-range-to-retrieve-ifs-forecasts-from-ecmwf-open-data/14225 "2025-10-02T19:56:30Z")
Hi, I’m using the ECMWF OpenData Python package to retrieve IFS forecasts. When I try various dates with client.retrieve(), I repeatedly get the following error: requests.exceptions.HTTPError: 404 Client Error: Not Fou… --- ## [New filenaming convention for AIFS and IFS products](https://forum.ecmwf.int/t/new-filenaming-convention-for-aifs-and-ifs-products/14122)
**Author:** [@Michela](https://forum.ecmwf.int/u/Michela)\ **Replies:** 0\ **Last updated:** [27 August 2025 16:49 UTC](https://forum.ecmwf.int/t/new-filenaming-convention-for-aifs-and-ifs-products/14122 "2025-08-27T16:49:09Z")
With the implementation of AIFS-Single and AIFS-ENS (CRPS), ECMWF introduced a new naming convention and will gradually phase out the current filenaming convention for IFS products. The current ‘Legacy’ naming conventio… --- ## [What is the soil temperature variable over the oceans in IFS and ERA5?](https://forum.ecmwf.int/t/what-is-the-soil-temperature-variable-over-the-oceans-in-ifs-and-era5/11822)
**Author:** [@Catherine\_de](https://forum.ecmwf.int/u/Catherine_de)\ **Replies:** 1\ **Last updated:** [25 March 2025 13:05 UTC](https://forum.ecmwf.int/t/what-is-the-soil-temperature-variable-over-the-oceans-in-ifs-and-era5/11822 "2025-03-25T13:05:35Z")
Hello, I am using soil temperature data (stl, or sot depending on the age of the data) from the IFS and ERA5, and can’t work out what the data over the oceans for this variable is. Given the ocean is not land (obviousl… --- ## [IFS and ENS control and deterministic cy49r1](https://forum.ecmwf.int/t/ifs-and-ens-control-and-deterministic-cy49r1/10173)
**Author:** [@Alessio\_Golzio](https://forum.ecmwf.int/u/Alessio_Golzio)\ **Replies:** 0\ **Last updated:** [10 December 2024 12:06 UTC](https://forum.ecmwf.int/t/ifs-and-ens-control-and-deterministic-cy49r1/10173 "2024-12-10T12:06:42Z")
Dear all, Since the upgrade of Cycle 49r1, I understood that the ENS control member and IFS deterministic run (HRES) were identical or the same run. However, in today’s clustering product for the second forecast group, … --- ## [Can surface sensible heat flux be calculated using the equations from the IFS documentation?](https://forum.ecmwf.int/t/can-surface-sensible-heat-flux-be-calculated-using-the-equations-from-the-ifs-documentation/1117)
**Author:** [@Nils\_Slaettberg](https://forum.ecmwf.int/u/Nils_Slaettberg)\ **Replies:** 0\ **Last updated:** [10 August 2023 15:11 UTC](https://forum.ecmwf.int/t/can-surface-sensible-heat-flux-be-calculated-using-the-equations-from-the-ifs-documentation/1117 "2023-08-10T15:11:52Z")
\----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------… --- ## [Introduction of new parameters in CAMS global atmospheric composition forecasts](https://forum.ecmwf.int/t/introduction-of-new-parameters-in-cams-global-atmospheric-composition-forecasts/1070)
**Author:** [@Anabelle](https://forum.ecmwf.int/u/Anabelle)\ **Replies:** 0\ **Last updated:** [2 August 2023 09:14 UTC](https://forum.ecmwf.int/t/introduction-of-new-parameters-in-cams-global-atmospheric-composition-forecasts/1070 "2023-08-02T09:14:21Z")
Last month, we announced that ECMWF introduced a new upgrade (48R1) of the CAMS (Copernicus Atmosphere Monitoring Service) global real-time data assimilation and forecasting system on 27 June 2023. This upgrade introduc… --- ## [CAMS Model CY48R1 successfully upgraded on 27 June 2023](https://forum.ecmwf.int/t/cams-model-cy48r1-successfully-upgraded-on-27-june-2023/1299)
**Author:** [@Anabelle](https://forum.ecmwf.int/u/Anabelle)\ **Replies:** 1\ **Last updated:** [28 June 2023 09:08 UTC](https://forum.ecmwf.int/t/cams-model-cy48r1-successfully-upgraded-on-27-june-2023/1299 "2023-06-28T09:08:36Z")
ECMWF implemented a new upgrade of the CAMS (Copernicus Atmosphere Monitoring Service) global real-time data assimilation and forecasting system on Tuesday 27 June 2023. Key elements are: Addition of full strato… --- ## [Cofficient of Permeability Soil](https://forum.ecmwf.int/t/cofficient-of-permeability-soil/1265)
**Author:** [@Sergio\_MONTANA\_SALAS](https://forum.ecmwf.int/u/Sergio_MONTANA_SALAS)\ **Replies:** 0\ **Last updated:** [27 June 2023 12:55 UTC](https://forum.ecmwf.int/t/cofficient-of-permeability-soil/1265 "2023-06-27T12:55:00Z")
According to the soil classification for layers 1 to 4, I need to know the permeability coefficient according to this classification. Is there any manual with this information? --- ## [Calculation of Low Cloud Cover](https://forum.ecmwf.int/t/calculation-of-low-cloud-cover/1062)
**Author:** [@Raffael\_Aellig](https://forum.ecmwf.int/u/Raffael_Aellig)\ **Replies:** 1\ **Last updated:** [15 July 2022 10:07 UTC](https://forum.ecmwf.int/t/calculation-of-low-cloud-cover/1062 "2022-07-15T10:07:10Z")
How is the variable Low Cloud Cover calculated in ERA5? I guess it is done with maximum-random-overlap but there is only a hint in the description there are made assumptions about overlaps. Thank you for answering. --- ## [Eta vertical coordinate in IFS](https://forum.ecmwf.int/t/eta-vertical-coordinate-in-ifs/860)
**Author:** [@Amelie\_Mayer](https://forum.ecmwf.int/u/Amelie_Mayer)\ **Replies:** 2\ **Last updated:** [13 April 2022 12:53 UTC](https://forum.ecmwf.int/t/eta-vertical-coordinate-in-ifs/860 "2022-04-13T12:53:14Z")
Hello everybody, I have difficulties to understand the connection between the hybrid sigma vertical coordinate, eta, and the model levels used in the IFS model. More specifically, I would like to know how to determine t… --- ## [ERA5-land snow initialization](https://forum.ecmwf.int/t/era5-land-snow-initialization/1322)
**Author:** [@Michael\_Shaw](https://forum.ecmwf.int/u/Michael_Shaw)\ **Replies:** 0\ **Last updated:** [10 December 2021 17:26 UTC](https://forum.ecmwf.int/t/era5-land-snow-initialization/1322 "2021-12-10T17:26:12Z")
Hello. Can someone describe or point to how ERA5-land gets initialized and how often (e.g. once at the very beginning of multi decade run? or once every day?)? And from what fields? (ERA5 analyses, e.g.?) And, wh… --- ## [Global analyses and forecasts of CO2 and CH4 - implementation of cycle 47r3](https://forum.ecmwf.int/t/global-analyses-and-forecasts-of-co2-and-ch4-implementation-of-cycle-47r3/1012)
**Author:** [@Anabelle](https://forum.ecmwf.int/u/Anabelle)\ **Replies:** 0\ **Last updated:** [26 October 2021 15:36 UTC](https://forum.ecmwf.int/t/global-analyses-and-forecasts-of-co2-and-ch4-implementation-of-cycle-47r3/1012 "2021-10-26T15:36:59Z")
We would like to inform you that we have upgraded the CAMS global analyses and forecasts of CO2 and CH4 to the latest model cycle of ECMWF's Integrated Forecasting System (IFS). This new cycle, CY47R3, replaces the curre… --- ## [CAMS Model CY47R3 upgrade on 12 October 2021](https://forum.ecmwf.int/t/cams-model-cy47r3-upgrade-on-12-october-2021/854)
**Author:** [@Michela](https://forum.ecmwf.int/u/Michela)\ **Replies:** 0\ **Last updated:** [26 July 2021 11:13 UTC](https://forum.ecmwf.int/t/cams-model-cy47r3-upgrade-on-12-october-2021/854 "2021-07-26T11:13:30Z")
Dear CAMS users, ECMWF introduced a new upgrade of the CAMS (Copernicus Atmosphere Monitoring Service) real-time data assimilation and forecasting system on 12 October 2021. This upgrade is a minor upgrade with a l… --- ## [Successful CAMS Model CY47R2 upgrade on 18 May 2021!](https://forum.ecmwf.int/t/successful-cams-model-cy47r2-upgrade-on-18-may-2021/1014)
**Author:** [@Anabelle](https://forum.ecmwf.int/u/Anabelle)\ **Replies:** 0\ **Last updated:** [11 March 2021 11:47 UTC](https://forum.ecmwf.int/t/successful-cams-model-cy47r2-upgrade-on-18-may-2021/1014 "2021-03-11T11:47:48Z")
A new upgrade of the CAMS (Copernicus Atmosphere Monitoring Service) real-time data assimilation and forecasting system was implemented on 18 May 2021. This upgrade is mostly a technical upgrade but also includes a l… --- ## [ERA5-Land Liquid rainfall amount calculation by (Total precipitation - snowfall)?](https://forum.ecmwf.int/t/era5-land-liquid-rainfall-amount-calculation-by-total-precipitation-snowfall/1293)
**Author:** [@Anabelle](https://forum.ecmwf.int/u/Anabelle)\ **Replies:** 3\ **Last updated:** [18 February 2021 17:26 UTC](https://forum.ecmwf.int/t/era5-land-liquid-rainfall-amount-calculation-by-total-precipitation-snowfall/1293 "2021-02-18T17:26:44Z")
I would like to calculate the liquid rainfall amount using ERA5-land hourly data, as the descriptions of "total precipitation" says it includes both liquid and frozen water (i.e. rain and snow), I wonder if I only want t… --- ## [CAMS Model CY47R1 upgrade on 6 October 2020](https://forum.ecmwf.int/t/cams-model-cy47r1-upgrade-on-6-october-2020/1298)
**Author:** [@Anabelle](https://forum.ecmwf.int/u/Anabelle)\ **Replies:** 0\ **Last updated:** [13 July 2020 14:21 UTC](https://forum.ecmwf.int/t/cams-model-cy47r1-upgrade-on-6-october-2020/1298 "2020-07-13T14:21:49Z")
Dear CAMS users, ECMWF is planning to introduce a new upgrade of the CAMS (Copernicus Atmosphere Monitoring Service) real-time data assimilation and forecasting system on 6 October 2020. This upgrade includes var… --- ## [How to calculation of daily precipitation based on hourly precipitation rate - ERA5-Land hourly data from 1981 to present](https://forum.ecmwf.int/t/how-to-calculation-of-daily-precipitation-based-on-hourly-precipitation-rate-era5-land-hourly-data-from-1981-to-present/1303)
**Author:** [@xiangyi\_wang](https://forum.ecmwf.int/u/xiangyi_wang)\ **Replies:** 3\ **Last updated:** [12 June 2020 11:48 UTC](https://forum.ecmwf.int/t/how-to-calculation-of-daily-precipitation-based-on-hourly-precipitation-rate-era5-land-hourly-data-from-1981-to-present/1303 "2020-06-12T11:48:42Z")
The precipitation calculated by the following method is several times normal daily\_precipitation = xr.DataArray(name='prcp', data=(ds\['tprate'\]-ds\['sfrate'\]).groupby("time.dayofyear").sum('time'))\*3600\*1000 or daily\_prec… --- ## [Does "volumetric soil water layer 1" in ERA5-Land products represent the total water content including liquid and ice?](https://forum.ecmwf.int/t/does-volumetric-soil-water-layer-1-in-era5-land-products-represent-the-total-water-content-including-liquid-and-ice/1638)
**Author:** [@Anabelle](https://forum.ecmwf.int/u/Anabelle)\ **Replies:** 0\ **Last updated:** [6 January 2020 15:27 UTC](https://forum.ecmwf.int/t/does-volumetric-soil-water-layer-1-in-era5-land-products-represent-the-total-water-content-including-liquid-and-ice/1638 "2020-01-06T15:27:35Z")
Soil moisture includes both the liquid and the frozen part. It is not easy to separate both when soil moisture is mixed in both phases, but we assume a liner relationship between -1 and 3 deg Celsius. For ex., the HSAF-…