I'm really glad you saw it too. He looked out of the upstairs window to see why the outside light was suddenly sodium yellow, and screamed to me to get Small outside to see the rainbow. We couldn't see the horizon, but did get a good 300 degrees of rainbow going down into the alley and then got a faint but unmissable double rainbow backing it up. Then the lower clouds came over and we had to explain to Small why the rainbows had gone away, but the light was still spectacular, I can't really imagine what it must have been like from your balcony.
I tried photos, but even if the rainbows come out ok, the lighting ambience was uncatchable.