Tonight's full supermoon is known as the Hunter's Moon, as it is the first full moon after the Harvest Moon.
It's the final supermoon of the year and if you miss tonight's show, you will have to wait until October 2016 to see another one.
More info: http://www.al.com/news/index.ssf/2015/10/supermoon_oct_26-27_2015_last.html