From NWAC:
Field reports have been very sparse and spotty due to the resulting extreme avalanche danger and closure of many highways by either flooding, debris flows or avalanches, with avalanche related closures including I-90, US-2 and
SR-542, where a large avalanche descended onto the highway from Excelsior Mountain.
extreme avalanche danger and further widespread natural avalanche activity should be ongoing early Wednesday, with some avalanches that initiate in upper weak layers above the Dec 31st crust stepping down to or releasing on more deeply buried weaknesses such as the weak faceted snow near the ground. Although I-90 remains closed at this time, a recent report from the WSDOT control team early Wednesday morning indicates that a large natural avalanche just released from Denny Mountain and ran to the highway. Also debris flows involving slush, mud, rocks and trees have become more numerous late Tuesday through early Wednesday, and these should continue or increase in frequency during the day.
an increasing percentage of slides on Wednesday should begin to involve the older and generally weaker snowpack structure that developed in December, with such slides running long distances and taking out mature timber.
increasingly deep climax slides should be an increasing concern in most locations during the next 24 hours, the greatest threat for large destructive slides releasing to the ground should be along the Cascade east slopes and in the northern WA Cascades.