Avalanche Forecast

Moderate

Natural avalanche activity has tapered off with a few size 1-2.5 avalanches observed in the highway corridor in steep/extreme terrain since Sunday.

Artillery control produced excellent results on Tupper and Macdonald Sat night, with most shots producing sz 2 to sz 3 avalanches from steep start zones, running out onto valley bottom fans. Debris moved fast, likely picking up speed and mass on the buried surface hoar.

50-70cm of storm snow sits on a sun crust on steep solar aspects. In sheltered locations, this new snow sits atop surface hoar. Strong SW winds at the end of the storm created surface slab conditions on exposed Treeline and Alpine slopes.

There is a dense, well-settled mid-pack without any significant weak layers.

The Nov 9 crust is down 1-1.5m. The base of the snowpack is comprised of several dense, melt-freeze rain crusts formed in October.

A weekend storm will bring light to moderate snow Friday through Sunday.

Tonight: Cloudy. Alp Low -6. Light winds, Freezing level(FLZ): Valley bottom

Fri: Cloudy w/flurries. Trace precipitation. Light to Moderate S winds. FLZ: 1300 m

Sat : Flurries, 10-15 cm. Alpine high -5 °C. Moderate gusting to Strong SW winds. FLZ: 1400 m

Sun: Mix of sun and clouds w/flurries. Trace precip. Alp high -9. Light SW winds. FLZ: 900 m

• Be careful as you transition into wind-affected terrain.
• Keep in mind that human triggering may persist as natural avalanches taper off.