Based on the markings, this should be Micrathena gracilis.
http://galleries.northoftheridge.com/galleries/6_Spiders/photos/IMG_6581_Edit.jpg
http://www.uark.edu/ua/arthmuse/spinorb.html
http://bugguide.net/node/view/840822/bgimage
http://bugguide.net/node/view/827508/bgimage
http://bugguide.net/node/view/801817/bgimage
http://bugguide.net/node/view/142518/bgimage
http://bugguide.net/node/view/1996/bgimage?from=0
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