Large avalanches rocked Rogers Pass over the weekend, with very prominent fracture lines littering the mountain-scape everywhere. Be very suspicious of any slope that has not avalanched.
Natural avalanche activity has decreased but human triggering remains likely.
See this MCR for a detailed avalanche summary.
~70 cm of recent snow has been redistributed by extreme S'ly winds. Wind slabs have formed in all exposed terrain and may become more reactive with solar warming. Avalanches in motion may step down to deeper layers resulting in large avalanches.
Two persistent weak layers are buried down ~100 and ~130 cm. New snow combined with extreme winds has overloaded these weak layers triggering large, destructive avalanches. These weak layers are still within the realm of human triggering.
Natural avalanche activity has slowed down but avalanche control with explosives produced numerous avalanches from size 2 to 3.5 on Sunday.
The avalanche cycle on Friday saw numerous natural and explosive triggered avalanches up to size 4 running into valley bottom.
See the following link to a recent Mountain Conditions Report.
Extreme S'ly winds redistributed ~70cm of new snow into thick wind slabs on leeward features across the Alpine. Solar aspects (SE through W) have a surface crust from recent sun.
The Feb 9 surface hoar (SH) is down 90-120 cm and remains reactive in snowpack testing. The Feb 9 SH sits over a crust on solar aspects.
The Jan 26th layer, composed of surface hoar/facets/crust, is buried down 130-160 cm. The largest surface hoar is preserved in sheltered areas below treeline.
Unsettled weather arrives Tues afternoon, bringing flurries and gusty winds.
Tonight Cloudy. Low -4°C. Wind SW 30 gusting 50km/h. Freezing level (FZL) 1200m.
Tues Flurries, 10-15cm. High -3. Wind SW 25 gusting to 45km/h. FZL 1500m.
Wed - Flurries, 10cm. High -4°C. Ridge winds SW 20-45km/hr. FZL 1600m.
Thurs Flurries, 5-10cm. High -6°C. Ridge winds SW 20-35km/hr. FZL 1200m.
