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Avalanche Forecast

Apr 15th, 2023–Apr 16th, 2023
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Watch for unstable snow on isolated features: windslabs in the high alpine, and loose wet avalanches on steep slopes that face the sun.

Expect variable snowpack conditions as we transition from winter to spring.

Confidence

Moderate

Avalanche Summary

No new avalanches were reported before 4 pm on Saturday.

We expect that anywhere that was sunny on Thursday or Friday would have seen numerous, small, wet loose avalanches triggered by the sun on steep slopes. Also, there may be small pockets of windslab on exposed alpine ridges that could avalanche under the weight of a human.

If you have any observations from this region, let us know what you are seeing by submitting a report to the Mountain Information Network.

Snowpack Summary

In the alpine and around treeline, 5-10 cm of new snow covers a frozen crust, with moist snow below.

The mid snowpack is generally settled and strong at treeline and above.

A melt-freeze crust that was buried in mid January can be found 60 to 100 cm below the snow surface.

A weak layer of large, sugary crystals persists at the base of the snowpack. This layer has not produced recent avalanche activity in this area, but professionals continue to monitor for signs of it becoming active.

Weather Summary

Saturday Night

Mostly clear, no new snow expected. Freezing level falling to valley bottom. Treeline low around -7 °C Light building to moderate southwest ridgetop wind.

Sunday

Mix of sun and cloud . No new snow expected. Freezing level rising to 2300m. Treeline high around 3°C. Moderate southwest ridgetop wind.

Monday

Partly cloudy. Possible 1-5 cm of snow in the alpine. Freezing level at 500 m overnight, rising to 1600 m. Strong southwest ridgetop wind.

Tuesday

Mostly clear, no new snow expected. Freezing level falling to valley bottom at night and rising to 1500 m mid day. Treeline low around -7 °C Light southwest ridgetop wind.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for unstable snow on specific terrain features, especially when the snow is moist or wet.
  • Be alert to conditions that change throughout the day.
  • Be alert to conditions that change with aspect and elevation.
  • Use caution above cliffs and terrain traps where even small avalanches may have severe consequences.

Avalanche Problems

Loose Wet

During periods of daytime warming and sunshine, expect the surface snow to be unstable on slopes that face the sun.

A wet storm added a lot of moisture and heat to the upper snowpack earlier this week.

If you see signs of loose wet instability, like snow that feels like a slurpy, or clumps up and pinwheels down a slope, move to less steep and more shaded terrain.

Aspects: South East, South, South West, West.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2

Wind Slabs

Some dry snow remains on shaded slopes at high elevations. If the wind picks up, small windslabs could form below ridgetops.

Carfully evaluate for windslab hazard before committing to bigger features.

Aspects: North, North East, East, South East, North West.

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2