Avalanche Forecast

Issued: Feb 1st, 2021 3:00PM

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

Avalanche Canada JMackenzie, Avalanche Canada

Email

It's time to be head's up! Strong winds, warm temps and as much as 25cm of snow expected Tuesday. Avalanche hazard is trending to HIGH.

Summary

Confidence

Moderate -

Weather Forecast

Tuesday will be cloudy with temperatures between -2 and -5 and strong SW winds. The big unknown is the snowfall amounts, with forecasts ranging from 10 to 25cm. Let's hope it's 25cm!

Avalanche Summary

Visibility was somewhat limited today, but numerous loose dry up to size 1.5 were observed in Alpine and Treeline terrain on all aspects. Also, several wind slabs were observed up to size 2.5 in Alpine terrain on N, E and S aspects. These slabs appear to be 50 to 60cm deep on average.

Snowpack Summary

Another 30cm of new snow fell in the last 24 hours, bringing recent storm snow totals to between 60 and 70cm. So far this snow remains low density at lower elevations, but today at 2500m forecasters observed a change starting. The winds were moderate to strong from the SW and were quickly forming new surface wind slabs with some isolated cracking and whumpfing at ridge-crest. In addition, snowpack tests today indicate that all the recent storm snow is failing on the old wind slab surface down 60cm. Test results were variable ranging from very easy to moderate. Once the surface snow gains a bit more density, these new slabs will be quite sensitive to triggering.

Terrain and Travel

  • Be careful with wind slabs, especially in steep, unsupported and/or convex terrain features.
  • Be careful as you transition into wind affected terrain.
  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Cornices may release remotely when approached.
  • Avoid exposure to slopes that have cornices overhead.

Problems

Wind Slabs

An icon showing Wind Slabs

Lots of snow for transport, strong SW winds and mild temps are the perfect mix for fresh wind slab formation. By Tuesday afternoon this process was underway at Treeline, and slabs will become increasing sensitive to triggering.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Very Likely

Expected Size

1.5 - 2.5

Valid until: Feb 2nd, 2021 3:00PM

Login