I worked for the last 4 days at Callaghan Country's backcountry lodge. It is much like spring now with the height of snow at the lodge (4500', 1380m) stabilizing at 5m for the last couple of weeks. During the nights a 15cm crust has been forming and is weight supporting (to a skier) to about 6000' on N aspects. Above that elevation the snow surface transitions from crust to snow that is uneffected by temperature at about 6300' (only on steeper true N aspect). At the study plot (5150', top of tree line on a NW aspect) there was 20cm of wet snow above 40cm of moist stuff at 3pm yesterday afternoon.
On the 4th of April there where many natural sluffs to size 2 on all elevations (4500' - 7700') any aspect in direct sun. None of these slides propagated any slabs. A few low elevation cornices and snow mushrooms have dropped, but most of the higher cornices are still big and intact. The 5th - 7th of April where quieter in terms of sluffing, it seems the snow stabilized with the clear nights. In the valley at 4500' the larger creeks are beginning to open up, the smaller ones are still just dips in the snow surface.
The best skiing was on the supportive crust as it warmed up and formed corn, and higher up on the steeper N aspects.
I considered the Alpine and Treeline Hazard/Stability yesterday as Low/Very Good - but increasing with daytime warming.
Dave Sarkany, Ski Guide
Callaghan Country's backcountry lodge