Mare’s tails are a lovely cloud formation. They look like horses’ tails being whipped in the wind. Not surprisingly, they indicate wind high up. We had a beautiful display of them on Tuesday before the weather changed, And I’m using
Noctilucent clouds
Amazingly white clouds even though it’s dark? It could be the effect of sunlight on the upper atmosphere illuminating the clouds (up 50k in altitude) when the surface of the earth is in darkness. These noctilucent clouds can be truly