Birds will increase winter feeding before a big storm to gain extra energy or to cache or hide food in case food sources get covered up. That being said, birds have several food sources in their territories that they can visit from day to day. It isn’t unusual for them to “disappear” for a few days after a snow storm like the one we just had. They most likely picked one or two areas to feed from to expend less energy while it is colder and the snow is deep. They should return soon.
The other reason birds abandon feeding areas is because the food can become wet and moldy in heavy precipitation, so you’ll want to make sure the food in your feeders is fresh. That way, when they do return, they will want to feed.
Thanks for your question!
-Naturalist Renell Roebuck