It is my experience that fish will feed heavy a day or so before a front moves in, then slow for a couple days during and after the front. I don't think the snow cover is a concern, once the ice is 3 feet thick.
I fished yesterday and today on Blackstrap. Did catch 10 jumbos yesterday, but it took all day. When I cleaned them, their stomachs and intestines to their bum was full of them also. So this would support that they did feed heavy before the front, and the fishing was slow after the front. Today was also slow, but only fished 1/2 a day with 1 keeper walleye and 4 jumbos being caught.
To bad fish aren't like us humans, and have to feed 3 times a day, with snacks in between and then bedtime snack regardless if a front is moving in or out. Or maybe it's that fish go on diets more often then we do.