Weather oddity

I have a barometer which belonged to our parents. It has been amazingly accurate for a decorative item. It has a pointer which I set years ago when the barometric pressure was particularly low. (I wasn't home when the tornado went thru and didn't think to look when I got home several hours later.) Last week, our pressure went below the marker to 29.46. Today it is almost as high as I've seen it at 30.42. I know that doesn't mean much to most people but it is interesting to me.