NATIONAL CENTRE FOR MEDIUM RANGE WEATHER FORECASTING

MINISTRY OF EARTH SCIENCES, GOVERNMENT OF INDIA

The National Centre for Medium Range Weather Forecasting (NCMRWF) is a Centre of Excellence in Weather and Climate Modelling under the Ministry of Earth Sciences. The mission of the Centre is to continuously develop advanced numerical weather prediction systems, with increased reliability and accuracy over India and neighboring regions through research, development and demonstration of new and novel applications, maintaining the highest level of knowledge, skills and technical bases. This data web portal contains (1) IMDAA Data - high resolution (12km, 1-hourly) regional reanalysis over India, from 1979 to 2018 (Extended upto December 2020) and (2) NGFS Data - high resolution (25km, 6-hourly) Global reanalysis, from 1999 to 2018. For the continuity of the IMDAA regional reanalysis dataset beyond 31 December 2020, NCMRWF is releasing IMDAA-Like products derived from the operational NCMRWF Unified Model (NCUM) global NWP system of 12 km resolution. Unlike IMDAA reanalysis products, a few of the IMDAA-Like products are only available at 3 hourly intervals. Multi-level IMDAA-Like products are available only at 18 pressure levels. For more details kindly refer table in the "ABOUT IMDAA" tab.

This webportal is ready for public access! Users are requested to email the IMDAA related issues to "indirarani.s[at]gov[dot]in" And NGFS related issues to "kbrr.hari[at]gov[dot]in"

    IMDAA Reanalysis Updates - 18 October 2023

  • Revised and updated the procedure to run WRF with IMDAA reanalysis (README)

  • For the data continuity from 1 January 2021, IMDAA-like products from NCMRWF Global Model are disseminated through Reanalysis Portal. IMDAA-like products, pressure level variables are available at 18 levels.

  • For IMDAA-like products, pressure level variables are available at 18 levels. This is a known data issue and has been updated in known data issues document here .

    IMDAA Reanalysis Updates - 18 August 2022

  • Revised and updated the procedure to run WRF with IMDAA reanalysis (README)

  • For the time being, we are deactivating IMDAA Daily and Monthly mean product download. Users are advised to generate Daily and Monthly mean products from the hourly single level and three hourly pressure level datasets.

    Release of IMDAA-like Products (limited*) from 01 January 2021 onwards - Version (0.6) - July 2022

    This version of website is released on 20 July 2022 for public access with following change.


  • *IMDAA-like Products: IMDAA 1-Hourly Single Level & IMDAA 3-Hourly Pressure Level Datasets.

  • Currently daily and monthly mean IMDAA-like products are NOT available.

    Release of IMDAA Vertical Velocity product (1996 onwards) - Version (0.5) - June 2022

    This version of website is released on 12 June 2022 for public access.

    Release of Dedicated Reanalysis Data Services (RDS) Web Portal - Version (0.4) - July 2021

    This version of website is released on 22 July 2021 for public access with following change.


  • IMDAA Reanalysis Data is updated till December 2020.

    Release of Dedicated Reanalysis Data Services (RDS) Web Portal - Version (0.3) - March 2021

    This version of website is released on 11 March 2021 for public access with following change.


  • The NGFS Reanalysis Data (from 1999 to 2018) and the Real-time Analysis (not reanalysis) Data from 2019 to till date is available for public access!

    Release of Dedicated Reanalysis Data Services (RDS) Web Portal - Version (0.2) - September 2020

    This version of website is released on 17 September 2020 for public access with following change.

  • A dedicated subdomain named "https://rds.ncmrwf.gov.in" is assigned to this RDS webportal for public access.

  • Click here to watch MoES Live Webinar - titled "IMDAA Regional Reanalysis, NGFS Global Reanalysis & Reanalysis data Services at NCMRWF", recorded on 15-Oct-2020.

  • Currently this RDS webportal is running on a dedicated large storage server (100TBs) funded by "the Ministry of Earth Sciences, under the National Monsoon Mission programme".

  • IMDAA and NGFS Monthly (hour-by-hour) mean datasets are also released, along with hourly datasets. Select few variables of IMDAA and NGFS are released under daily datasets category.
    Check Datasets page to access 10 different datasets of both IMDAA and NGFS reanalysis.

  • Options for Grib2, NetCDF and Area subset are included.

  • A Live page for displaying current data download size, total processed queries count, etc., is added.

  • A documents page is included for IMDAA and NGFS variables list (with unit and NetCDF shortvar name), etc., and some known data issues.

  • A page for Privacy & Policy and Terms & Conditions (Creative Commons Licence: Attribution-Non-Commercial-Share-Alike - 4.0 International, Acknowledgements, etc.,) is included.

  • Users will receive email for every successful data request.

  • A dedicated mailing-list has been created to open discussion. Click here to subscribe.

    Release of Reanalysis Data Services (RDS) Web Portal - Version Alpha (0.1) - February 2020

  • NCMRWF (IMDAA and NGFS) Reanalysis Data Services Webportal is being released to the public on 24 February 2020.

  • IMDAA 1-Hourly and NGFS 6-Hourly datasets are also released.

  • IMDAA Reanalysis data was produced under "Ministry of Earth Sciences (MoES) National Monsoon Mission Programme".