Pittsburgh is very hilly and very overcast. The correct combination of these two things can yield some great sky and cloud photography. This isn’t great photograph per se, but it could have been with the right equipment and not a so-so phone camera. The right photographic “raw material” is there.
This was taken during the America Loves Bacon fest at Station Square, just south of downtown, right on the Monongahela River. No filter.
EDIT: Here is the same photo but with a filter, that I had posted on Facebook. This actually a bit closer to how I perceived it, both visually and the “sentiment” of it—my phone’s camera didn’t really capture the post-storm blueness that I saw.