24th January 2007

Visibility was very poor on the summits this morning (although it is clearing up now). Thick cloud like this really encourages the formation of hoar frost. Hoar frost forms on the wind ward side of objects. This is because the cloud consists of microscopic droplets of super cooled water. When these get blown onto surfaces they freeze on impact. Over time this process builds up a thick layer of snowy/icy material. Todays picture shows a hut on Aonach Mor looking fairly plastered in hoar

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