I have no doubt barometric pressure has a major effect on salmonids. Fishing Kamloops trout in the high country, where small storm cells move through several times a day its easy to see. As Rivrguy pointed out with Chinook you see a big increase in activity just before the low arrives. Activity stays high as it passes and drops right off as the low moves on. Then the pattern repeats itself again as the next system moves through. I have seen this way too much time to consider it a coincidence.

An old time steelhead angler and writer - of course I forget his name now - used to keep detailed track of barometric pressure and his success. He found a very strong correlation. (I may do some Goggling on this later if I get time.)

But . . As Doc say go when you can.