Hello Bob,
I think it's the sun (from at/just below the horizon) streaming through a gap/s in the clouds OR possibly reflecting upwards off low level cloud and illuminating the sky near dusk. I have an old photograph (from film!) near dusk which shows multiple such orange/red streams through the clouds, but your image has an interesting and more stark red/blue contrast, perhaps due to longer exposure & ISO
Best
JA
Last edited by JA; 15-02-2019 at 12:08 PM.
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