There are 2 races - Myrtle, with a white throat and more patterned face (which is what you have here) and Audubon's with the yellow throat and a somewhat plainer face.
This is the most common warbler I see out west. They are doing something right!
This is a pretty cool place. Just starting my walk and the first two birds I see are a Vermillion Flycatcher and Yellow Warbler. Then Vireos! At the end of the walk I get into a staring contest with this guy.