Regarding the sequence of migration for other small migrating birds in the mid-Atlantic region, Pine Warblers started first last month, earlier this month were the Yellow-throated Warblers, and Louisiana Waterthrushes. We are in the midst of Palm Warbler migration, which started in earnest about a week and a half ago, but will start to peter out shortly. The ones that are just starting in small numbers now are Northern Parula and Common Yellowthroat. Next week we should be getting the start for Blue-headed Vireo, Black-and-white Warbler, Black-throated Green Warbler, and Yellow Warbler.
And our winter friends, the Yellow-rumped Warblers, should be leaving us for northerly breeding grounds during this month and the beginning of next. (Golden-crowned Kinglets should be almost gone now; according to my refs most leave before RCKI).
Then, beginning the last week of this month, all hell breaks loose.
You could start seeing most of the migrants, including orioles, tanagers, and flycatchers. But some will come later in May, such as Canada Warbler, and Mourning Warbler and Blackpoll will come towards the end of migration
Best,
Jim