The National Weather Service's (NWS) numerical forecast models require dozens of software dependencies. Spack has become indispensable for providing highly customizable, reproducible software stacks that are configured consistently across R&D HPC platforms, cloud services, and continuous integration (CI) workflows. This presentation will discuss the requirements and challenges of deploying software stacks in the NWS research-to-operations process, with emphasis on the ongoing effort to bring a Spack-based solution to both the development and production environments on the NWS operational supercomputers. Several Spack-based custom tools that support a more streamlined, DevOps-oriented approach to model development will be discussed. These include recent developments to the spack-stack configuration framework; a TUI utility that enables fast developer builds on top of system-wide installations; a Spack extension for configuring and validating stacks; and several GitHub Actions-based solutions. Finally, the presentation will discuss possible approaches and challenges to implementing incremental, version-controlled operational code deliveries built with Spack.