Having been weened on Duck hunting many moons ago, back out west, there are literally millions of waterfowl during the peak of the migration. It's not unusual to show up at a refuge or club, and have close to, if not more than 500,000 ducks & geese within a 50 to 75 mile radius, some of these refuges will hold that many birds in a single place.
Now, you don't shoot limits everyday, but you get to see a lot of waterfowl in a day.
Anyhow, when a storm comes in, and the wind kicks up, everyone and their brother heads out, knowing that the birds will be stirred up, and they will fly low. presenting ample shooting opportunities.
Out here in Maine, it's a different beast, way less birds, but, if you can locate them, wind will be a benefit to you, they are seeking shelter, and they will fly around quite a bit. Light rain/wind or just wind is good. Heavy rain & wind not so good, but like I have said before, I have had some really good hunts in this kind of weather, again, it helps to have the birds around, otherwise you'll be looking at empty or near empty skies. Fog, not the super can't see through dense ground fog, but a high fog, 1/2 mile visibility can also be a killer.