Predict the weather with coffee

it would work if you drink a cup outside... but who does that?

That makes sense scientifically, but why tf are there bubbles in my coffee? Ewww!! Cappucino or cocoa,sure but plz no thick coffee. :o

Me: "guys it's gonna rain today"
Friends: "how do you know?"
Me: "my coffee told me by using bubbles"
Frineds: "You need to get out more Adam"

*bubbles spread over the surface* ummm