And the north end hospital is on diversion at night from 3pm until 8am the next morning.

Mystery solved, lightening ⛈️! So weird, if we didn't see the lightning honestly it was such a weird sound, never heard thunder like that (and I lived in Alberta for 30 years)

Thank you very much John! It must have been a quarry blast or something along those lines.

Hope you are having a great fall with your garden 🍂