Larry L wrote:
...
Actually, now that I think about it, a Larry tip for some waters. Watch
the birds, they too like the bugs and some waters ( HFork prime example )
have very distinct mico-habitats. Thus you may be someplace with zero
happening and a couple hundred yards away is an epic hatch, if you see birds
working, stooping to the surface ... mosey on over, it may be worth the walk

I've noticed the same thing with bats during the Hex hatch.
The Hex hatch is notoriously unpredictable, one night there's
millions of them and the next night nada. But the bats seem to
know when they're going to come off. On those nights when you
notice bats everywhere during the early evening you can almost
bet the farm there's going to be a good Hex hatch that night.
You just have to be careful you catch fish and not bats.

--
Ken Fortenberry