[EBB Sightings] Yellow-rumped Warbler Irruption

Okay, okay, I know Yellow-rumped Warblers aren't considered an  
irruptive species; however, we've had nearly twenty hanging around  
our artificial pond for the last few days.  Prior to this year, I  
don't ever remember seeing one here before (I'm not one for keeping  
records).  I've spotted at least two Myrtle and four Audubon's males  
in full or near breeding plumage, as well as a multitude of females  
and other males in various stages.  Are the Myrtles unusual for here  
(Sibley shows them here, but I've not seem them in the area before)?

Happy Spring Birding,

Steve Hutchcraft
Alamo