Spring-like diurnal conditions exist and the rating reflects the highest hazard level anticipated during the day. Pay attention to steep south facing slopes as they heat up in the afternoon and possibly destabilize. Give looming cornices a wide berth from above and below.
Especially in the southern half of the region where temperatures stay elevated overnight, warm temperatures and sunny skies can increase the likelihood of cornice failures. A cornice fall can be hazardous on its own. Minimize exposure to slopes that have cornices overhead, especially during the heat of the day.
Loose wet avalanches may occur during the heat of the day and primarily on solar aspects. Watch for changing snow surfaces like moist or wet snow, snowballing or natural avalanche activity. Steep slopes and around rocks will be most susceptible to natural avalanche activity.
Large looming cornices may become weak with warming and solar radiation.
A ridge of high pressure will remain anchored over the Interior until Thursday bringing warmer temperatures and sunny skies.
The typical spring-like diurnal weather pattern will hold afternoon alpine temperatures near -1 and freezing levels around 1500-2000 m. Overnight periods will see the freezing levels drop back to the valley bottom.
An approaching Pacific frontal system will move onto the coast Wednesday bringing unsettled weather and new snow to the Interior regions by Friday and through the weekend.
No new avalanche observations reported on Monday.
Several natural and explosives triggered wet loose avalanches up to size 3 on steep solar aspects were reported on Sunday. A large cornice failure (size 2.5) was observed and did not trigger a slab on the slope below. A large glide snow avalanche (size 2.5) was observed on a south aspect at treeline. A small wind slab pocket was triggered by a skier.
Sunny skies and warm temperatures formed sun crusts on solar aspects and at all elevations and up to 2000 m on polar aspects. Dry snow still exists on north aspects at upper elevations. Large cornices loom over alpine ridgetops.
Persistent weak layers of surface hoar, crusts, and/or facets 80-120 cm down have recently been unreactive except for an explosives triggered avalanche in the southeast of the region on Saturday.
