Entries by Helon Hoffer

Avalanche Advisory for Friday, February 23, 2018

This morning, there is no avalanche problem. Avalanche terrain consists of refrozen snow that with its hard, icy surface, will require the use of crampons and an ice axe to navigate safely. Long sliding falls are currently the greatest danger. Up to 2” of snow is forecast on increasing SW wind in the afternoon and will create areas of wind slab. If we receive the upper end of the forecast snow total, areas in the lee of SW and W wind may exceed the current Low rating.  Be aware of this in Hillman’s Highway, Left Gully and the Chute in Tuckerman as well as Escape Hatch, South and Odell in Huntington. Warming temperatures late may mix sleet and freezing rain into this snow, adding a wet layer to the snow surface. Travelers out late in the day should keep an eye on the sky and be prepared to re-evaluate plans if we receive the upper end of forecast totals.

Avalanche Advisory for Monday, February 19, 2018

Wind slab that formed over the weekend sits on a firm bed surface that has gone through multiple melt-freeze cycles. Yesterday’s 5” of snow fell on increasing wind speeds, creating large areas of wind slab. Wind speeds were at times strong enough to scour areas down to the icy bed surface, though these tend to be in lower portions of our terrain and present themselves with the appearance of gray snow or may even have a reflective sheen with today’s sun. Areas with a northerly and southerly exposure have the most scouring down low and contain firm-looking sastrugi up high, including Damnation and North in Huntington as well as the looker’s left fork of Hillman’s Highway. Places of most concern today will be the Sluice through Chute in Tuckerman and Central and Pinnacle in Huntington. Smooth wind slab dominates these areas and has covered rocks and old crown lines that were visible on Friday, giving an indication to the amount of loading that took place yesterday. Current blowing snow on SW wind of 45 mph is a sign that wind transport has not ended and our fetch still has transportable snow. SW shifting W wind today will allow areas of wind slab to grow in size today. While many gullies have old surface down low due to wind scouring, mid-elevations contain the largest smooth-looking wind slab that could prove touchy to human-triggers today.