East Slopes South

Moderate to strong E winds are returning to load atypical aspects. These winds may still be able to move enough snow to create shallow slabs from cold snow remaining on polar aspects. Steer around steep slopes and convex rollovers where you see signs of active or recent snow transport.

Mild weather continues and stable avalanche conditions are the norm. A strong inversion is still in place and temperatures at lower elevations and in valleys have stayed cool while spring-like conditions have been developing at higher elevations. Isolated pockets of wind slab may linger above treeline, especially on north and east facing slopes. Look for and avoid steep start zones where wind has recently deposited snow. Favor slopes under 35 degrees where you see evidence of freshly blown snow. Don't overlook the possibility of a loose wet avalanche where warmer temperatures and sunshine meet preserved fresh snow. Look for evidence like rollerballs on the snow surface to clue you into avoiding slopes with direct sunshine if you see evidence of a weakening snow surface.

Previous Discussion: The most recent storm brough 2-6" of snow to the region on Monday. Tuesday afternoon into Thursday, a strong temperature inversion combined with multiple freezing levels, and strong easterly flow are all factors that indicate snowpack variability can be expected by aspects, elevation, and even slope to slope. Thursday saw a switch to mild westerly wind, which allowed warming temperatures to reach the east slopes of the Cascades with temperatures rising above freezing in most locations. The east winds and cold air pool east of the Cascade Crest are returning. The Bumping Ridge SNOTEL stationhas dropped down to the freezing mark as of 5 PM on Friday evening while winds at nearby Pigtail Peak on White Pass are around 30 mph. We think that there is still some cold, dry snow to move around, but not a lot. Expect shallow slab development and watch for similar loading patterns to the slabs that formed Tuesday into Thursday. You might also find older slabs to maintain some reactivity, but there is a significantly lower likelihood of triggering these potentially larger slabs. This OBSERVATION suggests that the older wind slabs were reactive on Thursday in the nearby West South zone near White Pass.

During the ongoing Covid-19 pandemic, continue to follow the latest guidance from local, state and federal health officials. Avoid unnecessary risks that could impact first responders and stress medical resources.  Wear a mask when appropriate, practice social distancing, and consider recreating closer to home.