Parallelize tasks that can be run in parallel

Describe the Enhancement

• Pulling GFS data: each forecast hour can be pulled in parallel
• ungrib.exe: each file can be "ungribbed" in parallel
• metgrid.exe: each metgrid file can be processed as soon as ungrib.exe completes for that hour
• UPP/graphics: each forecast hour can be processed as soon as the WRF output is written to disk

Time Estimate

1 day per sub-issue

Sub-Issues

Consider breaking the enhancement down into sub-issues.

• Pull GFS data for each forecast hour in parallel
• ungrib each GFS input file in parallel
• process metgrid files once ungrib completes for a given hour

Relevant Deadlines

NONE

Define the Metadata

Assignee

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Labels

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Projects and Milestone

• Select Project
• Select Milestone as the next official version or Backlog of Development Ideas

Enhancement Checklist

• Complete the issue definition above, including the Time Estimate and Funding Source.
• Fork this repository or create a branch of develop.
  Branch name: feature_<Issue Number>/<Description>
• Complete the development and test your changes.
• Add/update log messages for easier debugging.
• Add/update tests.
• Add/update documentation.
• Push local changes to GitHub.
• Submit a pull request to merge into develop.
  Pull request: feature <Issue Number> <Description>
• Define the pull request metadata, as permissions allow.
  Select: Reviewer(s), Project, and Development issue
  Select: Milestone as the next official version
• Iterate until the reviewer(s) accept and merge your changes.
• Delete your fork or branch.
• Close this issue.

The issue names no files, tests, or entry points; start by locating the workflow that pulls GFS data and runs ungrib.exe, metgrid.exe, and UPP/graphics. Break the work into the listed sub-issues, then define completion as independent forecast hours progressing concurrently with each downstream step starting after its corresponding input is ready.