The anticipated update of the MRMS system to version 12.0 became operational at the National Weather Service at 1330 UTC on 14 October 2020. The MRMS v12.0 build is the largest update to the MRMS hydrometeorological product suite since the initial operating capabilities in September 2014. This build includes a series of scientific advancements ranging from a new dual-polarization synthetic radar QPE to a multi-sensor QPE that gap-fills areas of poor radar coverage.
More details about MRMS v12.0 can be found here: Code Updates Page
Operational Product Viewer Web Page: https://mrms.nssl.noaa.gov/qvs/product_viewer/