This morning when I pulled open the curtains at 4:55, this is the sight I saw.
click on photo to enlarge.
The whole sky was overcast with just a small crack in the clouds in the East, (to my right as I took the picture). This start of a rainbow was to the North, North West. I suspect that the predominance of red has something to do with the low angle the suns rays were striking the water droplets. All together it lasted less than 5 minutes and the clouds closed and it was gone.
I wonder how many saw it, not many I suppose.