In the following video, Motley Fool energy analyst Joel South takes a look at Ultra Petroleum (NASDAQ:UPL), and asks why it might be a great buy today. The stock was beaten down after low natural gas prices in 2012 made for a difficult year, but with those prices significantly higher than the sub-$2 mark, the future looks bright for UPL. With many of the other natural gas producers having shifted into oil production, natural gas supply is now starting to retreat, which means the price is set to slowly climb higher. Getting in with UPL at this price point, before those natural gas prices go back up, could represent a big opportunity for investors.