Lake Erie and Ontario ice cover Apr 5th, 2001

This is a pretty interesting image.  Not only do we see the ice cover that is showing further signs of decreasing, but we can see what's left of snow cover as well.  The snowcover almost looks like a topographic map.  That's because the snow conforms to elevation very well.  A ballpark estimate based on the image suggests that all elevations above about 1200ft. are most likely snow covered while everything below that has no snow left.  The last couple of snow events were actually "elevation snows" where it was cold enough at higher elevations for snow, while down lower it was all rain.  Notice on Lake Ontario, the only ice cover is up near the St. Lawrence River.