A reminder this is what 90ish-cm over 72 hours looks like from our last experience of it:
The city was completely shut down for 8 days. A whole bartering economy sprung up - people putting diapers and cans of food in the snowbank for people to take. After 3-4 days the City finally accepted it went on longer than they advised people to prepare, so with the army's help some superettes and groceries opened. It was an insane experience, and great practice for us just weeks before COVID lockdowns.
And, this being St. John's, we made the best of it.