There are two series of code updates with the MRMS QPE product suite. The first set of changes come with the development products on an NSSL internal server. These products are experimental and change frequently to accommodate code changes. Only select end-users within NOAA and NASA are privy to this data. Those using development MRMS products have to accept the caveat and caution that these products are experimental, not always available, and subject to change without external notification. A list of code updates on any particular development product can be requested by contacting mrms@noaa.gov.
The second set of changes are the official code updates at NCEP on the NCO system. This page is for the operational suite of MRMS products. Listed below are the most recent significant build for the MRMS system with a summary of updates for the QPE-related products in that particular build and the plans for future builds. Information regarding past operational builds, including the large update associated with MRMS v12.0, can be found on the past update page.
MRMS v12.3.0 Update to NCO
Implementation Date: 5 August 2025
Highlights of Changes Made to the MRMS QPE Product Suite:
- Support for NWS radar Volume Coverage Pattern (VCP) 34
- Upgrade to ProbSevere v3.0
- Multi-PRF Dealiasing Algorithm (MPDA) Support
- Lightning Scale Parameter Changes
- Updates to Quantitative Precipitation Estimates and Radar Quality Control
More information on this build can be found through the following link:
MRMS v12.2.6 Update to NCO
Implementation Date: 28 November 2023
Highlights of Changes Made to the MRMS QPE Product Suite:
- The radars maintained by Environment and Climate Change Canada (ECCC) underwent a change to adjust their scanning strategies in June 2023. This ultimately led to a dropout of Canadian radar data into the MRMS product creation since 5 June 2023. This build accounted for the new ECCC radar scanning strategies.
More information on this build can be found through the following links:
Future Updates
Continued research and development of the MRMS system by CIWRO and NSSL scientists and software engineers will allow for advancements of the science, technology, and application of the MRMS product suites. As more products become ready to transition to operations, future MRMS builds to be delivered to NWS NCO will be announced.