In my case it’s clear blue skies and anything like stillness or being relaxed.
Edit: for some context the footage of 9/11, the people falling off the plane in Afghanistan, the explosion in Beirut, and many others had that same ominous clear blue sky in the background.
I drove at least a thousand miles to see the one that crossed the US in 2017. I agree with the awesomeness of it all- and despite being in the middle of nowhere, there were a lot of people around, so when totality began, there was this collective gasp that was almost as amazing as the eclipse itself.