Needless to say, the panels were covered over completely with a healthy layer of snow.
We were out early Sunday morning to get a head start on shoveling. The panels were still completely covered. Then we heard it -- it sounded like thunder but it was actually an avalanche. When it was over a sizable group of panels on the main roof were visible again (and the front sidewalk suddenly had three feet of hardpacked snow so we had to reshovel it.)
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I didn't expect any production given that so many panels were covered but it was a rather sunny day and by afternoon we were producing more juice than we used.
Snow on the panels is something I worried about because I suspected (correctly, as it turns out) that snow would let go and slide off in large sheets. That's what happened but the only consequence was a need to do some reshoveling...