Snow forecasts are uncertain and the snowpack is untrustworthy. Conservative decision making is critical.
Summary
Confidence
Low - Timing, track, or intensity of incoming weather system is uncertain
Weather Forecast
Clashing fronts make the next few days difficult to forecast. A Pacific warm front and an Arctic cold front are converging over the Rockies, creating the potential for surprise accumulations of low density snow. Timing, location, and intensity are highly uncertain (and so are the snowfall estimates).FRIDAY: The first wave of snow starts Thursday night with 5-15 cm then another 5-10 cm possible throughout the day on Friday / moderate west wind / alpine temperatures around -5 C.SATURDAY: Continued flurries with 5-20 cm possible / strong northwest wind / alpine temperatures around -5 C.SUNDAY: Ongoing flurries / strong west wind / alpine temperatures around -3 C.
Avalanche Summary
On Thursday, a few small slabs were triggered by skiers in the southeast part of the region. The slabs occurred in the top 20 cm of new snow. A few natural wind slabs up to size 2 were also reported throughout the region over the past three days.A few large persistent slab avalanches were observed this week (up to size 3), but likely occurred during the warm stormy weather on Sunday and Monday. Many of these avalanches failed on the deeper November and December weak layers, and many were triggered by cornices falling on north and east facing slopes.
Snowpack Summary
Expect waves of fresh snow over the next few days as storm snow accumulates. The distribution will be spotty, as some areas already have 30 cm and others nothing. Stay aware of the condition of the new snow. Mostly low density powder is expected, but could become heavy if it warms up. Also watch for slab development in wind affected areas.About 20-50 cm of recent snow covers a weak layer that was buried in mid-January. It is composed of feathery surface hoar in sheltered areas and a sun crust on solar aspects. Another surface hoar layer from early-January is buried 30-60 cm deep. A widespread weak layer from mid-December is composed of facets, crusts, and surface hoar and is now buried 60-80 cm deep. Finally, a weak layer of rain crusts and sugary facets buried in late-November exists near the base of the snowpack. Although the snowpack structure is variable across the region, these persistent weak layers are generally widespread. Snowpack depths are also variable across the region and typically thinner in northern areas than in areas to the south.
shorton,
Avalanche Canada
