If it's during the day in the summertime I think it's probably insects.
This site seems to have a good intro:
For a bunch of links and archives:
On Tue, Jul 25, 2017 at 5:17 PM, Eben McLane <etmcl...@gmail.com> wrote:
> I don’t have a sophisticated knowledge of Dopler radar images/patterns,
> but it seems to me from poking around NOAA radar just now that there are
> familiar signatures of bird migration in the midwest and the south. Are
> more experienced people on this list picking up signs of migration? Seems a
> bit early for these radar signatures (?) For all I know, I could be
> mistaking migration for particularly heavy mist.
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