Obvious snow ice boundary here in Norway when Liz got her first September ski day:
The suncups Liz is skiing here look a lot like the ones in ChrisC's Muir snowfield post. I observe that suncupping varies by latitude. The lower the latitude the more overhead the sun is, gouging deeper suncups. It's the hard sides and points of suncups that makes skiing them unpleasant. The suncups above are more rounded, can soften easier IMHO.
When you get to very high altitudes (4000+M) but very low latitudes in Chile the sun is almost vertical in spring/summer and the troughs melt out completely, leaving Penitentes.
The peaks lose ther snow more gradually by sublimation, which keeps them cooler than the troughs which melt into water.
When you get to very high altitudes (4000+M) but very low latitudes in Chile the sun is almost vertical in spring/summer and the troughs melt out completely, leaving Penitentes.
I would love to see someone trying to ski that. Not that I would want to try to ski that, but I think it would be fascinating to see someone make the attempt. Is it even possible?