With the snow piling up and more coming, Joe Bradt sends in this photo and a timely reminder: Keep your furnace vents clear of snow.
A plugged intake or vent can lead to furnace malfunction and carbon monoxide poisoning.
The Rome Sentinel has a related story.
That should have a downwards
That should have a downwards pointing exhaust/intake. I do heating and AC for a living. Just another pointer.