Dance Before The Storm

The expression "it's looking a bit black over Bill's mother's" immediately springs to mind. It's one of those local phrases that, when I first moved away from the area, I had to tone down my use of, as it just tended to bewilder people.

For the uninitiated: it's said that "Bill" is William Shakespeare, and "his mother's" is presumably in Stratford-upon-Avon; the phrase as a whole, therefore, suggests stormclouds on the horizon.