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JD. That mid 60's dip in sea temperatures was real. At that time I lived in Swansea on the coast of the Bristol Channel. Walking my dog on the beach one winter afternoon, I was astounded to see large plates of ice, some 3 inches thick washed ashore. Ice age global cooling evidence was before my eyes!

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Yes, it coincides with the really big freeze of '63 that I remember well. A real event that is captured in SST. I'll need to flag this period for modelling because something was clearly happening that was abnormal. This isn't just the polar vortex going for a walkabout!

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