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The weather all day has been more or less overcast with white broken alto-stratus, and for 3 degrees above the horizon there is a grey belt looking like a blizzard of drift, but this in reality is caused by a constant fall of minute snow crystals, very minute.
On the 29th a cold south-easter blew off the ice-cliffs and the sun was trying to pierce a gauzy alto-stratus.
The fourth class, called alto-stratus, is a thick sheet of gray or bluish color, sometimes thin enough to let the sun shine through.