Archived

Avalanche Forecast

Apr 18th, 2017–Apr 19th, 2017

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

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

2: Moderate

The avalanche danger rating below treeline will be moderate

Regions: South Coast.

Storm slabs are the main concern in the north of the region (Sky Pilot area) while loose wet avalanches are the main concern in the south (North Shore mountains). Continually reassess conditions as you travel.

Confidence

Moderate - Intensity of incoming weather systems is uncertain on Wednesday

Weather Forecast

We're looking at unsettled and variably wet spring weather through Thursday, with clearing and fine weather for Friday.WEDNESDAY: More wet snow (10-15cm) above 1400m. Winds moderate southerly.THURSDAY: Flurries continue (5-10cm) with wet snow above 1500m. Winds light southwesterly.FRIDAY: Sunny with cloudy periods. Freezing level rising to 2100m. High temperatures to +9 Celsius. Winds light southerly.

Avalanche Summary

No new avalanches reported, but there have been limited observations lately.

Snowpack Summary

On Monday into Tuesday we had 40mm of precipitation in the North Shore Mountains, most of which fell as rain to the summits. In the Sky Pilot area, 20-30cm of snow likely fell above 1600m, forming storm slabs in the process. Southerly aspects at treeline and below contain moist snow: Loose wet avalanches remain a concern in this elevation band. Cornices remain large in some areas and could trigger large avalanches when they fail (especially when warmed by the sun, or drenched by rain). Additionally, cornices present a falling hazard and should be given a wide berth while traveling on ridgetops.

Avalanche Problems

Storm Slabs

Significant snowfall amounts may accumulate in the alpine (near Sky Pilot) if freezing levels are low enough and strong winds are blowing.

Be careful with wind loaded pockets, especially near ridge crests and roll-overs.Minimize overhead exposure during periods of heavy loading from new snow, wind.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Possible - Likely

Expected Size: 1 - 3

Cornices

Where cornices exist, they are unstable and should be avoided.

Give cornices a wide berth when travelling on or below ridges.Falling cornices can trigger large avalanches.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3

Loose Wet

With the incoming rainfall and continued warm temperatures, there is an increased risk of loose wet avalanches. Even small slides can have serious consequences.

Avoid exposure to terrain traps where the consequences of a small avalanche could be serious.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2