I noticed the sunrise as soon as I walked out of my house and thought about going back for the "real" camera, but had to just pass on that option.
The iphone app is called Dynamic Light. It adds "HDR" which increases the range of tones you see in the photo. Real HDR is done using a tripod and multiple exposures at various settings which you then align and merge in photoshop. I'm pretty content with this app as an "on the fly" substitute. It punches up a blah photo nicely.
(As I proofread this I realized I took this photo yesterday, not a few days ago. It's funny how a little stress can warp my sense of time. My father in law and his "girlfriend" are doing a bit better today.)