Over the last couple of years, I’ve noticed that I start feeling crummy between 18 and 24 hours before a significant weather change. I haven’t kept any records to see if it’s predictable, but I suspect it is.

Well, yesterday evening around 10pm or so, I started feeling crummy, which persisted through to sometime this afternoon. Even now, I’m still feeling a little blah. I happened to see the nurse at work this afternoon and we chatted about this for a bit. She told me that I’m not the first person to mention something like this to her and described, almost perfectly my symptoms, namely feeling kind of "fuzzy" like you have a headache about to form.

So, I looked up the air pressure readings for Ottawa for the last twenty-four hours. I started feeling under the weather (sorry!) around the same time the pressure started dropping. If you click on the graph at the right, you’ll be able to see a larger version.

The graphical area forecast (GFA) for the Ontario-Quebec region for 8pm this evening (click on the image to the left) shows Ottawa sitting on the 996 millibar isobar, so it doesn’t look like the pressure is going to drop much more than it has.  (At 5pm it was 99.9 kPa or 999 millibars.)

Oh, and I just looked out the window to see the first snowflakes of the season.  Sigh.