Lake-effect snow occurs when cold dry air passes over a larger warmer lake and picks up moisture and heat.
Clouds build overhead and eventually develop into snow showers as they move downwind.
In this image, the wind is seen to be moving from the north-west. It picks up moisture from Lakes Nipigon, Superior, and Michigan and deposits this as snow further downwind. Reduced solar intensity during the eclipse, meant that the processing software's assumptions about incoming solar radiation were incorrect. This resulted in a yellowing effect, seen throughout much of the image and most prominently along the eastern edge. In particular, Lake Erie looks as though it is filled with mustard.