# \#carra **URL:** https://forum.ecmwf.int/tag/carra/25.md [Latest](https://forum.ecmwf.int/latest.md) · [Categories](https://forum.ecmwf.int/categories.md) · [Tags](https://forum.ecmwf.int/tags.md) --- ## [Wind rotation question](https://forum.ecmwf.int/t/wind-rotation-question/15203)
**Author:** [@Eva\_Hdez](https://forum.ecmwf.int/u/Eva_Hdez)\ **Replies:** 2\ **Last updated:** [21 September 2026 12:15 UTC](https://forum.ecmwf.int/t/wind-rotation-question/15203 "2026-09-21T12:15:06Z")
We are interested in converting the grid-relative wind components provided in the CARRA dataset into earth-relative (true north/east) wind components, u\_earth and v\_earth. For the CARRA West domain we are using this code… --- ## [Recent issues in three-hourly 2m temperature analysis data fields CARRA-East](https://forum.ecmwf.int/t/recent-issues-in-three-hourly-2m-temperature-analysis-data-fields-carra-east/14587)
**Author:** [@Peter\_von\_der\_Gathen](https://forum.ecmwf.int/u/Peter_von_der_Gathen)\ **Replies:** 3\ **Last updated:** [9 July 2026 11:49 UTC](https://forum.ecmwf.int/t/recent-issues-in-three-hourly-2m-temperature-analysis-data-fields-carra-east/14587 "2026-07-09T11:49:37Z")
Hi all, I found an issue with respect to recent (2025) three-hourly 2m temperature analysis data fields in CARRA-East and another issue common for many variables. In some months there appear from time to time bias fi… --- ## [CARRA User Workshop - 10-11 June 2026 - Copenhagen, Denmark](https://forum.ecmwf.int/t/carra-user-workshop-10-11-june-2026-copenhagen-denmark/14803)
**Author:** [@Anabelle](https://forum.ecmwf.int/u/Anabelle)\ **Replies:** 1\ **Last updated:** [3 July 2026 10:42 UTC](https://forum.ecmwf.int/t/carra-user-workshop-10-11-june-2026-copenhagen-denmark/14803 "2026-07-03T10:42:08Z")
To the attention of C3S regional reanalysis users, Upcoming user workshop on the Copernicus pan-Arctic Regional Reanalysis (CARRA2) Event date: 10-11 June 2026 Location: Copenhagen (livestreaming will be also avail… --- ## [CARRA2/CARRA data confusion total precipitation](https://forum.ecmwf.int/t/carra2-carra-data-confusion-total-precipitation/15013)
**Author:** [@Jayne\_Doshi](https://forum.ecmwf.int/u/Jayne_Doshi)\ **Replies:** 2\ **Last updated:** [27 May 2026 12:27 UTC](https://forum.ecmwf.int/t/carra2-carra-data-confusion-total-precipitation/15013 "2026-05-27T12:27:57Z")
Hello, Please urgently help me anyone: CARRA data which all forecast and time hours i need to download in order to convert to the daily data total precipitation. Copernicus also provide daily calculated total precipita… --- ## [Time order of variables from CARRA wrong](https://forum.ecmwf.int/t/time-order-of-variables-from-carra-wrong/14908)
**Author:** [@Halldor\_Bjornsson](https://forum.ecmwf.int/u/Halldor_Bjornsson)\ **Replies:** 0\ **Last updated:** [27 April 2026 09:57 UTC](https://forum.ecmwf.int/t/time-order-of-variables-from-carra-wrong/14908 "2026-04-27T09:57:25Z")
Last December I sent a message about the time order of a Carra variable being incorrect. I recently downloaded several variables for 2025 and they all had the time order wrong. Fixing this with cdo sorttimestamp is eas… --- ## [How was gust value calculated in the CARRA data (single levels)](https://forum.ecmwf.int/t/how-was-gust-value-calculated-in-the-carra-data-single-levels/14608)
**Author:** [@Xiaoli\_Larsen](https://forum.ecmwf.int/u/Xiaoli_Larsen)\ **Replies:** 0\ **Last updated:** [14 January 2026 15:51 UTC](https://forum.ecmwf.int/t/how-was-gust-value-calculated-in-the-carra-data-single-levels/14608 "2026-01-14T15:51:50Z")
Hi there. Anyone can provide information and reference to how the variables “10m eastward wind gust since previous post-processing“ and “10m northward wind gust since previous post-processing“ calculated? Thanks. --- ## [CDS API request for CARRA data failed ](https://forum.ecmwf.int/t/cds-api-request-for-carra-data-failed/14581)
**Author:** [@Leonardo\_Mingari](https://forum.ecmwf.int/u/Leonardo_Mingari)\ **Replies:** 1\ **Last updated:** [13 January 2026 15:43 UTC](https://forum.ecmwf.int/t/cds-api-request-for-carra-data-failed/14581 "2026-01-13T15:43:12Z")
Hello, I’ve been requesting CARRA data with this type of scripts for several months: dataset = “reanalysis-carra-model-levels” request = { (…) ‘date’: ‘2025-07-16/2025-07-17’, (…) } But it’s not working anymore … --- ## [Time order of snow depth water equivalent for 2025 in Carra (West)](https://forum.ecmwf.int/t/time-order-of-snow-depth-water-equivalent-for-2025-in-carra-west/14565)
**Author:** [@Halldor\_Bjornsson](https://forum.ecmwf.int/u/Halldor_Bjornsson)\ **Replies:** 0\ **Last updated:** [30 December 2025 15:56 UTC](https://forum.ecmwf.int/t/time-order-of-snow-depth-water-equivalent-for-2025-in-carra-west/14565 "2025-12-30T15:56:22Z")
I am using Carra West data and was updating my files for the year 2025. I noticed that the snow water equivalent file seems to have changed when new data was added to it. The gribfile (I am asking for analysis all data… --- ## [New dataset published in CDS: Arctic regional reanalysis daily and monthly data from 1991 to present](https://forum.ecmwf.int/t/new-dataset-published-in-cds-arctic-regional-reanalysis-daily-and-monthly-data-from-1991-to-present/14206)
**Author:** [@Michela](https://forum.ecmwf.int/u/Michela)\ **Replies:** 0\ **Last updated:** [2 October 2025 09:15 UTC](https://forum.ecmwf.int/t/new-dataset-published-in-cds-arctic-regional-reanalysis-daily-and-monthly-data-from-1991-to-present/14206 "2025-10-02T09:15:00Z")
We are pleased to announce that a new dataset of the Copernicus Arctic Regional Reanalysis (CARRA) family has been published on 02 October 2025, in the Climate Data Store (CDS): Arctic regional reanalysis daily and mont… --- ## [Where can I get the topography data used in the CARRA](https://forum.ecmwf.int/t/where-can-i-get-the-topography-data-used-in-the-carra/11648)
**Author:** [@Tinghai\_Ou](https://forum.ecmwf.int/u/Tinghai_Ou)\ **Replies:** 1\ **Last updated:** [8 September 2025 13:37 UTC](https://forum.ecmwf.int/t/where-can-i-get-the-topography-data-used-in-the-carra/11648 "2025-09-08T13:37:48Z")
Hi, Is it possible to get the elevation/topography data in 2.5km resolution used in the CARRA? I would like to get the difference between CARRA and in-situ observation over Greenland, in which effects by the lapse rate … --- ## [CARRA coordinate system query](https://forum.ecmwf.int/t/carra-coordinate-system-query/13397)
**Author:** [@Alex\_Hall](https://forum.ecmwf.int/u/Alex_Hall)\ **Replies:** 0\ **Last updated:** [10 June 2025 14:18 UTC](https://forum.ecmwf.int/t/carra-coordinate-system-query/13397 "2025-06-10T14:18:26Z")
Hi, I’m trying to extract 10 m wind speed data from CARRA-west, and am confused on the coordinate system used for the CARRA grid. I see on the website it says ‘Lambert conformal grid with 1069 x 1269 grid points for the… --- ## [Carra snow depth variable changes level type at midnight june 30th 2022](https://forum.ecmwf.int/t/carra-snow-depth-variable-changes-level-type-at-midnight-june-30th-2022/10828)
**Author:** [@Halldor\_Bjornsson](https://forum.ecmwf.int/u/Halldor_Bjornsson)\ **Replies:** 3\ **Last updated:** [19 February 2025 08:50 UTC](https://forum.ecmwf.int/t/carra-snow-depth-variable-changes-level-type-at-midnight-june-30th-2022/10828 "2025-02-19T08:50:34Z")
Hi, I encountered a strange missing value in the sd ("snow\_depth\_water\_equivalent”) variable for June/July 2022, for the CarraWest domain (I have not checked the other domain). I am including the request for the dat… --- ## [CARRA East - grid change in 2023 and after](https://forum.ecmwf.int/t/carra-east-grid-change-in-2023-and-after/10133)
**Author:** [@jules\_boulard](https://forum.ecmwf.int/u/jules_boulard)\ **Replies:** 9\ **Last updated:** [19 February 2025 08:44 UTC](https://forum.ecmwf.int/t/carra-east-grid-change-in-2023-and-after/10133 "2025-02-19T08:44:19Z")
Hi, After getting errors while concatenating geographical subsets from CARRA-East domain, I noticed the grid has changed for gribfiles in 2023 and after, compared to 2022 and before. This seems to coincide with the … --- ## [Missing data in CARRA/West](https://forum.ecmwf.int/t/missing-data-in-carra-west/11019)
**Author:** [@Halldor\_Bjornsson](https://forum.ecmwf.int/u/Halldor_Bjornsson)\ **Replies:** 2\ **Last updated:** [5 February 2025 10:10 UTC](https://forum.ecmwf.int/t/missing-data-in-carra-west/11019 "2025-02-05T10:10:16Z")
I am downloading CARRA/West variables to use for off-line SURFEX runs. One of the variables I need is ‘Time integral of total solid precipitation flux’ I noticed that in many years there is data missing for a day or tw… --- ## [Direct and diffuse solar radiation in Carra](https://forum.ecmwf.int/t/direct-and-diffuse-solar-radiation-in-carra/10733)
**Author:** [@Halldor\_Bjornsson](https://forum.ecmwf.int/u/Halldor_Bjornsson)\ **Replies:** 0\ **Last updated:** [10 January 2025 11:07 UTC](https://forum.ecmwf.int/t/direct-and-diffuse-solar-radiation-in-carra/10733 "2025-01-10T11:07:45Z")
We are planning to use CARRA as forcing data for SURFEX runs with a multilevel snow scheme for snow on glacier modelling. SURFEX needs to have direct and diffuse solar radiation separately. However"ssr" and “ssrd” are b… --- ## [CARRA CDS API download, netcdf output creates zip file](https://forum.ecmwf.int/t/carra-cds-api-download-netcdf-output-creates-zip-file/977)
**Author:** [@Axel\_Schweiger](https://forum.ecmwf.int/u/Axel_Schweiger)\ **Replies:** 1\ **Last updated:** [13 September 2024 14:09 UTC](https://forum.ecmwf.int/t/carra-cds-api-download-netcdf-output-creates-zip-file/977 "2024-09-13T14:09:33Z")
Below script generates instead of a netcdf file a zip file that contains one file for each time instead of one netcdf file that contains all times. Anyway to change this? Thanks Axel import cdsapi c = cdsapi.Cl… --- ## [Negative values in CARRA precipitation data](https://forum.ecmwf.int/t/negative-values-in-carra-precipitation-data/3099)
**Author:** [@Halldor\_Bjornsson](https://forum.ecmwf.int/u/Halldor_Bjornsson)\ **Replies:** 3\ **Last updated:** [21 June 2024 08:30 UTC](https://forum.ecmwf.int/t/negative-values-in-carra-precipitation-data/3099 "2024-06-21T08:30:31Z")
Following the instructions about how to calculate CARRA precipitation rate found on https://confluence.ecmwf.int/pages/viewpage.action?pageId=338485814 I have downloaded accumulated TP from CARRA at timesteps 6,9,12,15… --- ## [Exact calculation of u\_10 and v\_10 wind components on ERA5 single levels](https://forum.ecmwf.int/t/exact-calculation-of-u-10-and-v-10-wind-components-on-era5-single-levels/2924)
**Author:** [@Paul\_Meyer](https://forum.ecmwf.int/u/Paul_Meyer)\ **Replies:** 1\ **Last updated:** [12 June 2024 08:45 UTC](https://forum.ecmwf.int/t/exact-calculation-of-u-10-and-v-10-wind-components-on-era5-single-levels/2924 "2024-06-12T08:45:43Z")
Hi all, I am trying to find out, how u\_10 and v\_10 are retrieved on the single levels in ERA5. Comparing to the model levels indicates an overestimation of the velocities at 10m. I assumed that they are interpolated fro… --- ## [Calculating wind direction from CARRA u, v grids](https://forum.ecmwf.int/t/calculating-wind-direction-from-carra-u-v-grids/1869)
**Author:** [@Talfan\_Barnie](https://forum.ecmwf.int/u/Talfan_Barnie)\ **Replies:** 2\ **Last updated:** [20 February 2024 10:29 UTC](https://forum.ecmwf.int/t/calculating-wind-direction-from-carra-u-v-grids/1869 "2024-02-20T10:29:54Z")
Hi everyone, I’m trying to calculate wind direction from u and v wind components following the instructions in section 5.3 here: https://confluence.ecmwf.int/display/CKB/Copernicus+Arctic+Regional+Reanalysis+(CARRA)%3A… --- ## [Subset a CARRA region](https://forum.ecmwf.int/t/subset-a-carra-region/1041)
**Author:** [@Halldor\_Bjornsson](https://forum.ecmwf.int/u/Halldor_Bjornsson)\ **Replies:** 2\ **Last updated:** [30 January 2024 17:30 UTC](https://forum.ecmwf.int/t/subset-a-carra-region/1041 "2024-01-30T17:30:46Z")
I am have used both the API and the toolbox to fetch data from CARRA. When I try to get a subsample of the data (a smaller area within the domain) I get an error. Is this something that cannot be done as part of the r… --- ## [Carra West Orography](https://forum.ecmwf.int/t/carra-west-orography/1178)
**Author:** [@Axel\_Schweiger](https://forum.ecmwf.int/u/Axel_Schweiger)\ **Replies:** 1\ **Last updated:** [1 December 2023 09:46 UTC](https://forum.ecmwf.int/t/carra-west-orography/1178 "2023-12-01T09:46:59Z")
Anyone know how I can download the static orography field for the CARRA West Domain. The field is greyed out in the CDS. Thanks --- ## [CARRA User Workshop (last reminder) and Q&A page](https://forum.ecmwf.int/t/carra-user-workshop-last-reminder-and-q-a-page/828)
**Author:** [@Andras\_Horanyi](https://forum.ecmwf.int/u/Andras_Horanyi)\ **Replies:** 0\ **Last updated:** [19 September 2023 07:52 UTC](https://forum.ecmwf.int/t/carra-user-workshop-last-reminder-and-q-a-page/828 "2023-09-19T07:52:01Z")
It is the last reminder of the coming CARRA User Workshop (21 September), please check details at https://climate.copernicus.eu/copernicus-arctic-regional-reanalysis-carra-user-workshop. It is not late yet to register an… --- ## [GRIB to NetCDF File | Download as NetCDF File](https://forum.ecmwf.int/t/grib-to-netcdf-file-download-as-netcdf-file/1397)
**Author:** [@Kim\_Cholibois](https://forum.ecmwf.int/u/Kim_Cholibois)\ **Replies:** 7\ **Last updated:** [10 July 2023 06:59 UTC](https://forum.ecmwf.int/t/grib-to-netcdf-file-download-as-netcdf-file/1397 "2023-07-10T06:59:21Z")
Dear all, I have been trying to download Arctic regional reanalysis on single levels from 1991 to present for the following parameters: 10m wind direction, 10m wind speed, 2m temperature, Albedo, Surface net solar radia… --- ## [CARRA User Workshop - 21 September 2023 - registration is open](https://forum.ecmwf.int/t/carra-user-workshop-21-september-2023-registration-is-open/969)
**Author:** [@Andras\_Horanyi](https://forum.ecmwf.int/u/Andras_Horanyi)\ **Replies:** 0\ **Last updated:** [16 June 2023 15:07 UTC](https://forum.ecmwf.int/t/carra-user-workshop-21-september-2023-registration-is-open/969 "2023-06-16T15:07:13Z")
We are happy to inform you that we are organising an online CARRA User Workshop. This event will happen on the 21st of September 2023. More details can be found at https://climate.copernicus.eu/copernicus-arctic-regional… --- ## [CARRA User Workshop in autumn (21 September, 2023)](https://forum.ecmwf.int/t/carra-user-workshop-in-autumn-21-september-2023/1501)
**Author:** [@Andras\_Horanyi](https://forum.ecmwf.int/u/Andras_Horanyi)\ **Replies:** 0\ **Last updated:** [17 May 2023 10:24 UTC](https://forum.ecmwf.int/t/carra-user-workshop-in-autumn-21-september-2023/1501 "2023-05-17T10:24:22Z")
We would like to give you an early notice for a forthcoming CARRA User Workshop, which will be held virtually on the 21st of September. Please stay tuned for more information about the draft agenda and the registration d… --- ## [CARRA - start of Timely Update service](https://forum.ecmwf.int/t/carra-start-of-timely-update-service/1402)
**Author:** [@Anabelle](https://forum.ecmwf.int/u/Anabelle)\ **Replies:** 0\ **Last updated:** [28 February 2023 10:14 UTC](https://forum.ecmwf.int/t/carra-start-of-timely-update-service/1402 "2023-02-28T10:14:28Z")
We are pleased to inform you that the Copernicus Climate Change Service (C3S) at ECMWF has today, Tuesday 28th February 2023, started the Timely Update service for the Copernicus Artic Regional Reanalysis (CARRA) dataset… --- ## [Start of Timely Update service](https://forum.ecmwf.int/t/start-of-timely-update-service/1502)
**Author:** [@Andras\_Horanyi](https://forum.ecmwf.int/u/Andras_Horanyi)\ **Replies:** 0\ **Last updated:** [24 February 2023 14:59 UTC](https://forum.ecmwf.int/t/start-of-timely-update-service/1502 "2023-02-24T14:59:40Z")
We have just started the Timely Update service for the Copernicus Artic Regional Reanalysis (CARRA) datasets. In practise it means that every end of the month (on the 27th at 3 pm UK time) we are going to update the 4 CA… --- ## [Further extension of the dataset](https://forum.ecmwf.int/t/further-extension-of-the-dataset/1442)
**Author:** [@Andras\_Horanyi](https://forum.ecmwf.int/u/Andras_Horanyi)\ **Replies:** 0\ **Last updated:** [20 February 2023 10:29 UTC](https://forum.ecmwf.int/t/further-extension-of-the-dataset/1442 "2023-02-20T10:29:26Z")
As part of our preparations for the CARRA regular Timely Update service, we have extended the datasets until the end of November, 2022. --- ## [Additional variables in the single level entry](https://forum.ecmwf.int/t/additional-variables-in-the-single-level-entry/1500)
**Author:** [@Andras\_Horanyi](https://forum.ecmwf.int/u/Andras_Horanyi)\ **Replies:** 0\ **Last updated:** [20 December 2022 10:28 UTC](https://forum.ecmwf.int/t/additional-variables-in-the-single-level-entry/1500 "2022-12-20T10:28:51Z")
It is our pleasure to inform you that the “Arctic regional reanalysis on single levels from 1991 to present” CDS catalogue entry had been updated with 27 new variables (see at https://cds.climate.copernicus.eu/cdsapp#!/d… --- ## [Planned data releases](https://forum.ecmwf.int/t/planned-data-releases/971)
**Author:** [@Andras\_Horanyi](https://forum.ecmwf.int/u/Andras_Horanyi)\ **Replies:** 0\ **Last updated:** [24 October 2022 16:28 UTC](https://forum.ecmwf.int/t/planned-data-releases/971 "2022-10-24T16:28:05Z")
In this post we briefly list the foreseen data updates for the Copernicus Arctic Regional Reanalysis (CARRA) datasets with indicative target dates of publications. We plan to provide separate news topics for each of the … [Next page](https://forum.ecmwf.int/tag/carra/25.md?match_all_tags=true&page=1&tags%5B%5D=carra)