This 'circumzenithal' or 'Bravias' arc appeared for around 40 minutes at 7.20pm last night.
They usually just last for a couple of moments and are caused by light shining at a specific angle through tiny ice crystals in the clouds.
They are much brighter than a normal rainbow with the colours in reverse order.
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He will round off his visit at a project which aims to improve opportunities for young people and reduce youth violence.
Variable cloud overnight but brighter tomorrow.
Dry with light winds. Fog patches by morning.