In reply to Dave Hewitt:
I think I must have been right at the boundary of two or three air masses.
I drove down through freexing fog, but Moffat and Moffat Dale were cool and mist-free with blue skies; sub-zero first thing, but thawing a bit at the end. But there was still an inversion - it warmed considerably a few hundred metres up. Off to the south there was low cloud/mist filling the valleys with the Dumfries and Galloway hills and some in Cumbria, Northumberland and I think Yorkshire poking up.
As soon as I was over the first summit (Capel Fell), I could see cloud pooling against the hills from the north and east, up to about 600m; the Grahams, Donalds and Corbetts were poking up through it as islands, and the cols were all wreathed in mist; it was dead calm and t-shirt warm on the tops, and cool, with some frost in places, and a significant breeze, when in the cloud. I kept popping up out of it and dropping back in to it on the way across to Ettrick Pen and again on the way back to Croft Head, getting loads of fog-bows and faint-ish Brocken Spectres; at the end of the day the south end of Moffat Dale was still clear but there was mist spilling over into it a bit futher north. There were even a couple of mirages, with bits of distant hills appearing to hang in the air above the real hilltops. A really unusual (and lovely) day. And I found some graptolite fossils on the way down, who doesn't love long-dead colonial hemichordate marine animals?
Post edited at 20:11
