The National Weather Service has a good brief explainer: https://www.weather.gov/iwx/wsr_88d
They also have an interesting PDF covering some of the more unique signatures you might see, though it's not exhaustive: https://www.weather.gov/media/btv/research/Radar%20Artifacts...
You can typically go back and edit git history. But it will require force push and breaking changes. And a few sacrifices to ensure that it doesn't make a mistake because then your repo is potentially broken.
Best way to do that is probably to have it work on branches and then squash merge those.
Another problem I inadvertently dodged by using Jujutsu with Claude Code :)
I tend to send a lone "commit" message to Claude when I think I'm in a spot I may want to return to in the future, in case the current path doesn't work out. Then Claude commits it with a decent message. It knows how to use jj well enough for most things. Then it's really easy to jj new back to a previous change and try again.