Hell Fog

Today I walked from Holme village to Holme Moss,it was steep and unforgiving,I carried my scope,bins large flask of coffee and packed lunch.it was good to see Red Grouse in there natural habitat of billberry slopes just off the moors edge ( a beautiful species when in its own).Short eared owl,Curlew,Golden plover and lapwing were all observed in good light.I reached the top and set up my scope ,I could hear Golden Plover overhead but could not locate them.I could easily see Ovenden moor wind farm in the distance and a small whisp of cloud on the nearby hill.Within 20 minutes of reaching the cloudless top,it was covered in thick fog from nowhere,it covered the whole area.the bottom of my tripod was covered,i dont recall ever seeing such thick fog in JUNE visibility was down to 10 feet.I had to stumble down the track to the car and away , the fog stll thick at Blackmoor foot but had lifted by the time I got home..................????