Ask Marilyn: Why Does Water Inside Move When It's Windy Outside?

Augie Cammarata of Brick, New Jersey, writes:

Marilyn: Why does the water in my bathroom bowls become agitated when it's windy outside?

Marilyn responds:

Because your living structure, whether it's a single-family dwelling or a big apartment building, is swaying in the wind. They're designed to give a little. If they were rigid—like a concrete bunker, for example—they would be more susceptible to structural damage in high winds.