I watched over 1500 swifts swirl down into the main chimney of the old Hannah Ashton school in Reynoldsburg (SE suburb of Columbus) this evening, so the last wave of swifts is passing through central Ohio now.  Swifts appear to also move in waves much like other migrants, but we just don't notice it as much because we rarely see them outside of a few visits to roosts.  If you watch roosts regularly, you'll see pulses of big numbers; the last usually hits Ohio sometime around the last week of September, which correlates well with the final wave of early October birds that passes through southeastern states like Florida.

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