swifts

[Judith Lukin-Amundsen <>]

Well, John, I was kind of comparing the usual sightings which are reported - i.e. of swifts appearing and being immediately followed by a storm, which might clear soon after - with something I've seen - that is, swifts appearing, then, days later, rain setting in, perhaps for some time.

        Is it usually considered that both of these events occur?

Judith.

> Judith,
> There's no
> mystery.  When a cold front comes through it is preceded by a
> strong updraft, which picks up insects from low down and carries them
> into the upper air. That's what the swifts are feeding
> on.
> John