I came down off the ridge at six thirty on a July morning and walked into it like a wall. From the top I could see the whole valley filled in flat and white, with the tops of the sycamores along the creek sticking up out of it like something floating. Fifty yards down the grade I was inside it, and the world shrank to about a hundred feet of gravel and a strand of barbed wire off to my right.
Fog is the only weather that makes a familiar road unfamiliar. Rain and wind and cold change how a walk feels. Fog changes where you are. I have walked that lane a few hundred times, and in fog I still have to think about which gate is coming up.
Why the bottoms get it and the ridge does not
Around here the fog that matters forms on clear, calm nights after a warm damp day, and it settles in the low ground first. Cold air runs downhill like water and pools where the water pools, so the creek bottoms and the wet corner of the east field fill up while the ridge stays clear. Standing at the top on a morning like that you can see exactly where it ends, and the line is sharper than you would expect.
The practical use of that is you can pick your weather by elevation. If I want to be out of it I stay high and walk the ridge road. If I want to be in it, and I usually do, I drop down. Either way the pattern usually burns off within a couple of hours of the sun getting on it, so a foggy morning is not a lost morning, it is a morning with two very different walks available depending on when you leave the house.
Fog is wetter than it looks
This one surprised me the first few times. Standing in thick fog for an hour will get you as wet as a light rain, just slowly and from every direction at once. It collects on your sleeves, it beads on your hat brim, and if you walk through waist high grass or a fencerow in it you come out soaked from the belt down, because every stem and leaf has been collecting all night and hands it all to you at once.
So I dress for fog like I dress for drizzle. Something on top that sheds, and no cotton pants unless I have accepted my fate. The other thing fog does is fool you about temperature. Sixty five degrees in still fog feels chilly for the first ten minutes, then feels warm and close once you are moving, because the air is not taking any sweat off you at all. On summer fog mornings I sweat more than the thermometer says I should.
Being seen matters more than seeing
This is the real safety item and it took me an embarrassingly long time to take it seriously. On a foggy morning on a county gravel road, a pickup coming up behind me is not going to see anything but gray until it is close, and the driver is looking for the ditch line and the mailboxes, not for a man walking.
So in fog I do three things. I wear something bright, orange in the fall and whatever I have the rest of the year. I walk facing traffic even where I would not bother otherwise. And I get off the road entirely when I hear an engine, which means I am listening the whole time instead of daydreaming. I have had a grain truck come by close enough on a foggy morning that I could feel the wash of it, and after that I quit treating hi vis as something only road crews need.
Sound goes strange
Nobody warned me about this part and it is one of my favorite things about walking in it. In heavy fog, sound does not behave. A dog barking half a mile off can seem like it is in the next field. A tractor working somewhere in the bottom is impossible to place. Cattle you cannot see sound much closer than they are, and geese coming over the creek can startle you badly because you hear them before you have any idea where they are.
What you lose in distance you get back in detail. With nothing to look at more than a hundred feet away, I notice what is right at hand. Spider webs strung across every fence panel, loaded up and visible for once. The particular smell wet gravel has. Water in the culvert. On a clear morning I am looking at the far tree line and thinking about the day ahead. In fog I am about six feet wide and actually here.
The morning I missed my own gate
Last fall I went out in fog thicker than I had judged from the porch and decided to walk the long loop through the Neese place anyway. It is three gates, a turn at a culvert, and a stretch of turn row that connects back to the lane. In clear weather I could do it in my sleep.
I walked right past the second gate. Never saw it. The fencerow all looks the same at fifteen feet, and I had been counting on landmarks a quarter mile off that simply were not there. I kept going, got confused about which field I was standing in, and ended up adding better than a mile and coming out on the county road a good ways from where I meant to. Never in any danger, just wrong, and it took me twenty minutes of walking on pavement to sort out where I actually was. Now in real fog I stick to routes with a road under my feet the whole way, and I save the cross country connections for a morning when I can see the far end of the field.
Why I still go
Because it is the closest thing to a new place I can get within a mile of my own house. The same road I have walked in every season turns into something I do not recognize, and things come out of it as I walk. A round bale. A tree I forgot was there. A deer that stands and looks at me from thirty feet because it did not know I was coming either.
It also ends. That is part of it. You walk in the white for an hour, the sun gets some angle on it, and the whole thing lifts off the field in about ten minutes and hands the valley back. I have stood still and watched that happen more than once, which for a man who is usually trying to get his miles in and get to work is not nothing.