Following a morning and afternoon of intermittent showers, the first traces of a rather weak rainbow began forming today (September 11) in the northeastern sky over Vancouver’s Fairview neighbourhood, at about 3:50 p.m.
By 4:01 p.m. the pale arc of red, yellow, blue and mauve was fully extended across the clouded sky and I was sure—intensity-wise—that was as good as it was going to get.
I was wrong, of course.
The rainbow not only failed to diminish in hue for the next 13 minutes but actually gained in both coherence and altitude (if not intensity).
And even then it really took its time fading!
The last glimmer of prismatic colour was visible as late as 4:36 p.m., giving this not very strong rainbow a surprisingly long duration of about 46 minutes.