This photo brings back memories of one of our PF's wing deep in snow incubating her eggs. Was that Joli, Dennis? 
We've had a couple - Joli's nest we had to dig out because Hart was totally buried under the snow with just a little airhole to breath through.
Years before that, Princess and Trey had a nest on the east side of the Radisson that during an icestorm had them and the ledge totally encased in ice.
Tough little birds these.