On Friday, my knee got really achy and I couldn't figure out why. We'd taken Seamus for a hike in the woods, but it wasn't a very strenuous hike, and I'd deliberately chosen to not work out because I felt like my body needed a day of rest. My knee still gets stiff or a little sore from time to time, but mostly it hasn't been giving me much trouble.
Then on Saturday it poured for most of the day. Mystery solved!
Last night, my knee got achy again, and again, I wondered why. This morning when I woke up, it was raining.
Who needs Doppler radar? The knee knows.
Ah ha! I was wondering why my knees mysteriously felt fine after a 6-mile run last Sunday - we had beautiful weather that day. Friday and Saturday I ran the same distance, and they were achy. Hadn't thought about the weather as a cause.