Today a thin layer of cirrostratus rolled over the west coast ahead of a warm front due to drizzle on us all day tomorrow and formed this spectacularly crisp 22° solar halo which made for some excellent photo opportunities.
Solar halos are an almost daily phenomenon with the amount of frontal systems coming off the Atlantic at the moment, but this one was by far the most crisp, which I suspect was due to the cirrostratus being slightly thinner than usual, when it first arrived at least.
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