I've always wondered why the White Mountains don't get cornices like you see in Colorado or Utah. I have some theories, but nothing to explain the complete lack of cornices in New England when they are so prevalent in the west.
Every now and then I hear people talking about cornices in the northeast, but their definition is highly skewed. Often, a steep wall of snow passes as a cornice, but there is never anything like this:
Here are some ideas, but most of these just deepen the mystery.
Snowfall: Certainly Utah has more snow than NH, but in a normal year Colorado is right in line with what the higher summits get in the Whites. And Colorado gets plenty of cornices, they are just as common here as they are in Utah.
Wind: No arguments here. It's just as windy in the Whites as it is out west. It's probably even windier. The increased wind speed would also make up for any lack of snow.
Snow Density: Utah gets the world's best snow with densities of 6-10%, CO gets high altitude dust at 3-6%, and NH gets just about everything. From Sierra Cement to Utah powder. I'm not sure this matters either. The sludge that falls in California and Washington also has no problems forming cornices.
Treeline: The big argument here is that places out west have much larger areas above treeline to transport snow. This is a dead issue. Cornices out west are everywhere. Above treeline, in the trees, on house eaves, porches, lift towers, everywhere.
Terrain: I think this is the answer, sort of. It's just steeper out west. Ridge lines are sharp with steep drop-off's. In the northeast the mountains tend to more rounded. There are steep valleys, but their are no sharp ridges above them, everything just rolls into steepness.
Except...there are steep ridges. Lion's Head, above the Great Gulf, the east side of Monroe, Katahdin, and many more. Why are there no monster cornices in these places?