If the bubbles of coffee collect in the center of your cup, you can expect fair weather. If they adhere to the cup, forming a ring, you should expect rain. If they separate without assuming any fixed pattern, changeable weather should be on its way.I don't think I'd ever noticed bubbles in my coffee cup, but when I read about it I started looking for them. Sure enough, there they were! On inclement days the bubbles headed for the sides of the cup, but on the nice days they did stay in the middle
So, the coffee barometer worked. But why? I found the answer in a video on one of our local channel's Websites. The bubble's movement is caused by changes in humidity and air pressure.
Five years ago today: New thing #107--The Sound of Silence