Archived

Avalanche Forecast

Mar 29th, 2019–Mar 30th, 2019

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

2: Moderate

The avalanche danger rating below treeline will be moderate

Alpine

1: Low

The avalanche danger rating in the alpine will be low

Treeline

2: Moderate

The avalanche danger rating at treeline will be moderate

Below Treeline

2: Moderate

The avalanche danger rating below treeline will be moderate

Alpine

1: Low

The avalanche danger rating in the alpine will be low

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

Regions: South Columbia.

Cooler cloudy weather is approaching, but the danger will still be moderate during the heat of the day.

Confidence

High -

Weather Forecast

FRIDAY NIGHT: Partly cloudy. Light southwest wind. Alpine temperatures drop to -5 C.SATURDAY: A mix of sun and cloud with cloud increasing over the day. Light northwest wind. Alpine high temperatures around 0 C with freezing level to 2000 m.SUNDAY: Isolated flurries with some localized accumulations of up to 10 cm of new snow at higher elevations. Light southwest wind. Alpine high temperatures around -2 C with freezing level to 1800 m.MONDAY: Clearing skies throughout the day. Light north wind. Alpine high temperatures around -2 C with freezing level to 1800 m.

Avalanche Summary

On Thursday, several size 1-1.5 wind slab avalanches were triggered in the alpine (15-30 cm thick). One natural size 1.5 persistent slab avalanche occurred on a southwest aspect at 2100 m with limited propagation.Earlier in the week, wind slabs were reported on north and east aspects while loose wet releases were observed on sun-exposed south to west aspects.

Snowpack Summary

New crusts are likely found on all surfaces except for shaded slopes above 1700 m. On Tuesday, 10 to 30 cm of snow (variable over the region and increasing with elevation) buried a crust in most areas above 1500 m.The snowpack below about 1500 m has been disappearing rapidly under the recent warm temperatures, sunshine, and rain. The chance of loose wet avalanches increases each day as these factors break down surface crusts and bring snow to its melting point.The remainder of the snowpack is generally strong. Exceptions may exist on north aspects above 2000 m, where a layer of faceted grains may still be preserved beneath 50 to 70 cm of hard wind-affected snow.

Avalanche Problems

Loose Wet

A springtime regime of daily warm temperatures and sunshine will tend to destabilize surface snow each day, especially on steep, sunny slopes. Larger avalanches become possible during peak warming.

This problem may affect shaded aspects where air temperatures exceed 0 degrees.Avoid exposure to terrain traps, where the consequences of a small avalanche could be serious.Start and finish early to reduce your exposure to avalanche terrain during the heat of the day.

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

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Wind Slabs

Lingering slabs from Tuesday's storm may remain reactive to human triggers on Friday. This problem is likely to become increasingly confined to steeper, wind loaded slopes at ridgecrest.

Be careful around wind loaded pockets near ridge crests and roll-overs.Use ridges or ribs to avoid pockets of wind loaded snow.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 1.5