NBM Documentation - MDL
NBM Documentation
Documentation for the current operational National Blend of Models and previous versions, as well as text card documentation, NBM weather elements, and data encoding and availability are made available here. For a comprehensive overview detailing the process and output of the NBM, please visit our NBM Documentation hub page.
The interactive NBM Text Products Page with live with operational products can be found here. For older documentation, please refer to the previous versions page.
NBM Version 5.0
Version v5.0 is the current operational version which was implemented on May 5, 2026.
- SCN 26-24 Service Change Notice for NBM v5.0 upgrade
- PNS 25-45 Soliciting Comments on the Proposed Upgrade of the National Blend of Models - July 15, 2025
- NBM v5.0 Science Briefing
NBM Version 4.3
- SCN 25-34 Service Change Notice for NBM v4.3 upgrade - May 19th, 2025
- PNS 24-75 Soliciting comments for NBM v4.3 upgrade - December 16th, 2024
4.3 Development
- Overview of Changes in NBM v4.3
- MDL Science Briefing to the NCEP Director - January 27th, 2025
NBM Version 4.2
4.2 Development
- Upgrades and Improvements (PDF)
- Cobb Melting SLR Method (PDF)
- Initial Science Briefing (Sep 2023, PDF)
- Supplemental Science Briefing (Jan 2024, PDF)
- NBM v4.2 MEG Webinar (May 2024, PDF)
- Individual model cycle inputs per NBM cycle issuance (PDF)
Additional Resources