How can I seal this window gap?
I'm trying to reglaze and repair this original 1904 window. While doing so, I noticed that there's a huge gap between the 1980s era storm windows and the sill, probably from the house settling. It's a pretty narrow gap on the left, but gets worse to the right.
What's the best way to resolve it semi-temporarily, and preferably before Friday afternoon (because reasons)? Is using some of my glazing putty a dumb idea?
Additional context:
We just had everything in the basement reinforced and (slightly) leveled, so there shouldn't be any further settling.
I intend to get new storm windows eventually but that's a project for the future, I just spent all my money on the basement (see #1).
This is a third floor North facing window.
It's a historic home, but the preservation society only cares about the aesthetics and not the materials. (I assume the storms were grandfathered in or something)