creepy wind outside tonight

I'm sitting in the library for a few hours this evening, and it is one of those old-style libraries. The ceiling is very high, the windows are tall with the old-style panes that rattle in the wind, and it is growing dark outside. I can hear the wind blustering about outside, like a prowling animal, and it keeps rattling the window panes. But never all of them at once. I can hear the windows jutter in a row, as the wind sweeps down the side of the building. It is really giving me the creeps!