Regular readers will probably remember that I’ve written about the relationship between changes in air pressure and headaches on a number of occasions in the last few years, most recently in January. This morning, a friend of mine mentioned that she started the day with an optical migraine that morphed into a headache.  As it happened, I had a headache coming on at the time, so I took a quick look at Environment Canada’s website and noticed that the pressure over the last 24 hours had been steadily climbing. I took another look a few minutes ago and it seems to have peaked a couple of hours ago.

Taking a look at the surface analysis from 8am this morning, you can see a high pressure over southern Ontario. My guess is that it’s probably moved past us, which is why the pressure is starting to drop a bit. For reference, Ottawa is the red dot and the circle with X is the high pressure, just north of Lake Erie.

Anyone else plagued by headache, migraines or other things that might be caused by this?