Archived

Avalanche Forecast

Apr 18th, 2018–Apr 19th, 2018

Alpine

3: Considerable

The avalanche danger rating in the alpine will be considerable

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

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

4: High

The avalanche danger rating in the alpine will be high

Treeline

3: Considerable

The avalanche danger rating at treeline will be considerable

Below Treeline

3: Considerable

The avalanche danger rating below treeline will be considerable

Regions: South Coast.

Warming and sun on Thursday will weaken the recent snow and increase the likelihood of triggering avalanches. Be extra cautious on south-facing slopes. Avoid exposing yourself to hazard from large slopes or cornices overhead while its sunny or warm.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

TONIGHT: Clear. Ridge wind light, south. Temperature at treeline near +2. Freezing level 1600 m.THURSDAY: Mostly sunny. Ridge wind light, southwest. Temperature at treeline near +3. Freezing level 1600 m.FRIDAY: Cloudy. Rain changing to snow beginning in the evening. Precipitation 15-30 mm. Ridge wind light, south. Temperature at treeline near 0. Freezing level 1500 m, lowering to 1000 m.SATURDAY: Mostly cloudy, snow ending. Accumulation 10-20 cm. Ridge wind moderate, southwest. Temperature at treeline near -1. Freezing level 1200 m.

Avalanche Summary

We have received very little information on avalanche activity for this region. From what we have heard, skiers could easily trigger small loose wet avalanches on Monday. Natural loose wet avalanches were also observed in treeline and alpine terrain, particularly on southerly aspects. Over the weekend, large slab avalanches were also observed on the North Shore mountains that may have released during the storm on Friday. Read MIN report hereFurther north near Squamish reports indicated sun-induced natural activity on Sunday in alpine terrain.We would very much appreciate it if you spend a moment to submit any observations you have to the Mountain Information Network here, even if it is just a photo. Thanks!

Snowpack Summary

Above about 1200 m, 50 to 60 cm of moist snow sits on a predominant crust that formed at the beginning of April. The snow below this is well-settled and strong.Below 1200 m, a spring snowpack exists.

Avalanche Problems

Loose Wet

The sun and warming temperatures on Thursday will rapidly weaken the snow surface. Expect loose wet avalanches, particularly on steep southerly terrain and near rocks. Watch your overhead exposure, as wet slides can quickly gain mass and grow large.

Use extra caution on slopes if the snow is moist or wet.Avoid steep slopes when the solar radiation is strong.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2.5

Storm Slabs

Recent snowfall has formed storm slabs, which sit on a melt-freeze crust in most areas. Sun and warming could produce moist slabs failing on the crust. Also be cautious on or below corniced ridges. Cornices can become weak with sun and warming.

Be cautious as you transition into wind-affected terrain.Pay attention to overhead hazards like cornices, which could trigger slabs on slopes below.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Possible - Likely

Expected Size: 1 - 2.5