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Archived

Avalanche Forecast

Apr 23rd, 2018–Apr 24th, 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
3: Considerable
The avalanche danger rating in the alpine will be considerable
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
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
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: Northwest Coastal.

Sunshine and rising temperatures will elevate the avalanche danger throughout the week. Be aware of changing conditions throughout the day and avoid overhead hazards.This is our final daily forecast for the season which will expire on April 25th.

Confidence

Low - Due to the number of field observations

Weather Forecast

TUESDAY: Mix of sun and cloud. Light to moderate west wind. Alpine temperature +4. Freezing level 1500 m. WEDNESDAY: Sunny. Light west wind. Alpine temperature +9. Freezing level rapidly rising to 3200 m. THURSDAY: Sunny. Light southwest wind. Alpine temperature +12. Freezing level 3000 m.

Avalanche Summary

Several very large deep persistent slab avalanches(size 3-4) which were triggered by cornice failures and several natural wind slabs up to size 2.5 were reported near Bear Pass on Saturday. Avalanche reports have been limited due to very few information sources this time of year. If you have been out, please post your observations on the Mountain Information Network. (MIN)

Snowpack Summary

Cornices are large and when they fail there is the potential to trigger large avalanches on deeply buried weak layers. Lingering wind slabs may be reactive to human triggers on leeward slopes below ridgetops.In the south of the region, two layers of surface hoar are buried approximately 70-100 cm deep and most prominent on north to east aspects. Further north, these layers are around 40 cm deep. Below these March layers the mid-pack is generally well-settled and strong. In the far north of the region there are weak sugary facets near the bottom of the snowpack.

Avalanche Problems

Loose Wet

Sunshine and warming temperatures will increase the loose wet avalanche activity throughout the week.
Avoid exposure to terrain traps where the consequences of a small avalanche could be serious.Watch for signs that the snow is heating up such as pin-wheeling or the surface snow becoming moist.Minimize exposure to sun-exposed slopes when the solar radiation is strong.

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

Elevations: All elevations.

Likelihood: Likely - Very Likely

Expected Size: 1 - 2

Cornices

Sunshine and warming temperatures will increase the likelihood of cornice failures.
Falling cornices may trigger persistent weak layers deeper in the snowpack.Cornices become weak with daytime heating. Give them a wide berth both from above and below.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 2 - 3.5