Avalanche danger ratings reflect the highest danger level expected over the course of the day. Rising temperatures and solar heating will increase avalanche danger. Start early and finish early to take advantage of overnight freezing.
With intense solar inputs expected and lots of loose snow on solar aspects, we expect many loose wet avalanches over the next few days. Keep an eye on any sun exposed terrain above you and be off steep solar terrain before these start.
Warming temperatures may cause this problem to start showing up again. Significant solar warming , high alpine thin snowpack areas or places where a large cornice might have enough punch to trigger the deeper layers are the main areas of concern.
Cornices are huge and are failing triggering deeper persistent layers in the snowpack. With the intense solar input forecasted, they may start to fail early in the day.
Deep persistent slabs are best managed by:
Cornices are best managed by:
Light easterly winds & sunny skies continue for Wednesday. Freezing levels will rise to 2500 m with intense solar inputs expected at all elevations during the day. Good overnight freezes with slowly increasing freezing levels and lots of solar inputs are expected for the next several days as we progress to the spring diurnal hazard rating.
15 to 30 cm of storm snow at treeline with more at higher elevations. Buried crusts up to 1800m on all aspects and to ridge crest on solar aspects. Small wind slabs in alpine lee areas. Several persistent layers exist in the mid to lower snowpack that might be a concern in thin areas with significant warming or with larger triggers like cornices.
One size 3 deep persistent slab triggered by cornice failure at 10 am today on Mt. Stanley. Another size 2.5 cornice triggered slab on the Mt. Whymper from Monday afternoon. Several loose dry avalanches observed with in steep terrain as the sun warmed the surface. A few days ago, storm snow failed on a buried crust so this is worth monitoring.