Greetings!!
Yes, we were confronted with the identical situation this time last year!! 
Congrads to those that answered hatch-year female Wilson's Warbler. We have 
banded several Wilson's this fall already and most [both males and females] 
have at least some black in the crown--obviously not all!  It is supposed 
to be beautiful in the morning--we'll be banding at MUBO if anyone wants to 
come visit and see these fall warblers up-close for themselves.
Cheers
Dave