I spent about 3 hours early this morning birding my yard.
I found 13 species of warblers:
I missed black-throated green, connecticut, golden-winged and Yellow.
Other interesting birds found this morning include:
a flyover Red-headed Woopecker
a female Scarlet Tanager
I found 42 species total.
One of these days, I'll find time to do a county big day. I would guess that during peak migration, it's quite possible to break 120 in a day.