The meteorologists say there are many different types of fog: radiation fog, valley fog, advection fog, upslope fog and evaporation fog. Maybe today was just low cloud and not fog at all. The Rev. J.C.Atkinson writing in the last decades of the 19th century recounts of being lost on the moors when you “can not see the grouse that spring into flight almost at your very feet”. He uses the local word roke which he describes as a dense, wet fog that occurs often on the North York Moors. I think it was a roke today on Carlton Moor where the weather station provided a welcome relief for at that moment at least, I wasn’t lost.