Sea to Sky Avalanche Forecast

Issued: Mar 26th, 2021 4:00PM

Sat Mar 27th Current Conditions
Alpine Moderate Treeline Low Below Treeline Low
Sun Mar 28th 2 Day Outlook
Alpine Considerable Treeline Considerable Below Treeline Low
Mon Mar 29th 3 Day Outlook
Alpine Moderate Treeline Moderate Below Treeline Low

The alpine rating is moderate, the treeline rating is low, and the below treeline rating is low. Known problems include Wind Slabs and Cornices.

 Mainly overcast Saturday prior to the next round of precipitation on Saturday night into Sunday. 

Summary

Confidence

High - The snowpack structure is generally well understood.

Weather Forecast

FRIDAY Night: Cloudy with clear breaks, moderate northwest wind, treeline temperatures around -5 C, freezing level 1000 m.

SATURDAY: Mainly cloudy with sunny breaks and flurries in the afternoon, moderate southwest wind, treeline temperature around -4 C, freezing level 1100 m.

SUNDAY: Snow, accumulation 15-30 cm, moderate to strong southwest wind, treeline temperatures around -5 C, freezing level 1000 m.

MONDAY: Mix of sun and cloud, light north wind, treeline temperatures around -6 C, freezing level 800 m.

Avalanche Summary

A few cornices were triggered naturally and from explosives on Tuesday, Wednesday and Thursday. They were very large, as is expected at this time of year. On Thursday there was also a size 2 wind slab reported on a north aspect at 1900 m. 

Snowpack Summary

Snow accumulated earlier in the week with strong wind from the southwest switching to northeast. New wind slabs likely formed during this time, which may linger in steep, alpine terrain features. This snow adds to the 30+ cm that accumulated on the weekend. All of the new snow sits above a widespread crust, with the exception of high north-facing terrain. Observations suggest the snow has bonded well to the old snow beneath. 

Remember that cornices along ridgelines are large at this time of year and always have the possibility of failing naturally or from the weight of a human.

Terrain and Travel

  • Carefully evaluate steep lines for wind slabs.
  • Minimize exposure to sun-exposed slopes when the solar radiation is strong.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

Problems

Wind Slabs

An icon showing Wind Slabs

Likelihood

Unlikely-Possible

Expected Size

1 - 2

Lingering wind slabs may be found on all aspects up high due to strong wind from variable directions.

Aspects:

All aspects.

Elevations:

Alpine.

Cornices

An icon showing Cornices

Likelihood

Possible

Expected Size

2 - 3

Cornices are large and looming along many ridgelines, and have likely grown with the recent snow and wind.

Aspects:

North, North East, East, West, North West.

Elevations:

Alpine.

Valid until: Mar 27th, 2021 4:00PM

Forecast Trend

The latest forecast danger ratings, broken down to elevation. See how an elevation is trending.