Predict the Weather in a Cup of Coffee
This is a long standing trick used by farmers and backpackers alike.
Watch the bubbles when you pour your cup of coffee. Bubbles gathering in the center indicate a high-pressure system, which makes the coffee’s surface convex or higher in the middle. Since bubbles are mostly air, they migrate to the highest point. High-pressure means sunshine and cloudless skies. Same if the bubbles push to the edges quickly.
If the bubbles form a ring around the sides of the mug, however, the surface is concave and indicates a low-pressure system. Expect rain or overcast with in 12 hours. If bubbles slowly move to the edge of the cup the weather will clear soon enough.












