Friday March 12, 2021

Sunday March 14, 2021
Saturday March 13, 2021
Friday March 12, 2021
Confidence: Moderate - Additional forecaster field observations, uncertainty with Sundays precipitation amounts.

Main Concerns

Wind Slab, Storm Slab - view Avalanche Problems for detailed information.

Travel & Terrain Advice

Caution when transitioning into North aspect terrain with areas of wind loaded snow and steep convex roll features.

Caution travelling either above or below cornice features.

Avalanche Summary

No new avalanches have been observed or reported over the past forecast period.

Avalanche Problems

Wind Slab

Found on predominantly North aspects. This avalanche problem was formed during the past storms strong south west winds and has settled and bonded.

Location: North East thru to North West aspects and found in both the Alpine and Tree line.

Possibility: Triggering of this avalanche problem is unlikely to possible from light loads such as skiers. Natural avalanches are very unlikely.

Size: If triggered expect these avalanches to be large size 2, and on isolated terrain features very large, size 3 .

Storm Slab

This new avalanche problem will start to materialize on Sunday as up to 40cm of snow is forecasted .

Location: Alpine and Tree line.

Possibility: Triggering of this avalanche problem is likely to very likely from light loads such as skiers. Natural avalanches are possible to likely.

Size: If triggered expect these avalanches to be Large size 2, and on isolated terrain features very large, size 3.

Snowpack Summary

A period of overnight clearing and cooling promoted the formation of surface hoar, on solar aspects this new surface hoar was destroyed. but is still present on north aspects. Solar aspect terrain surfaces became moist and a crust formed during overnight cooling. The upper snowpack continues to settle and a facet crust combination can be found down 100 to 150 cm. Terrain exposed to the wind is stripped and scoured. The persistent slab from February is now down over 200 centimeters and is dormant and currently non reactive to testing. Below the snowpack is dense and well settled.

Snowpack Details

SurfaceSurface hoar on north aspects, thin crust on solar aspects.
UpperSettling new snow between 100 and 150 centimeters.
MidOld unreactive crusts, overall dense and well settled.
LowerWell settled and dense.

Past Weather

Freezing levels climbed to 1500 meters for a short period and direct solar aspect surfaces became moist. Overall the snowpack remained cohesive as warming and solar effect was brief.

Weather Forecast

Temps and freezing levels will slowly begin to rise as the ridge of high pressure to the east of the forecast area begins to break down. Beginning late Saturday, South East winds will begin to increase and light to moderate precipitation will start. Forecast models indicate the precipitation to be focused to the northern half of the forecast area.

Friday: 1 to 5 cm of snow. Winds Moderate from the Southwest, Freezing levels 800 meters. Temps at 1500 meters -5

Saturday: 1 to 5 cm of snow, Winds Moderate to Strong from the South East , Freezing level 1500 meters. Temps at 1500 meters 0

Sunday: 15 to 20 cm. Winds Strong from the South East, Freezing levels 1000 meters. Temps at 1500 meters -3

Posted on Friday March 12, 2021 by Jesse Percival

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