Rule of thumb: when the sky looks like a bruise, and you can no longer hear birds, GO INDOORS. Or you know... you can see clouds CIRCLING overhead. O_O
...we have blankets, cell phone and pillows in the "safe room" of our house, and I'm going back to watching the radar. (Turning off comments, not because I don't care about your thoughts, etc, but because I'm shutting all the electricity off, just to be safe.)