Avalanche Forecast Glacier National Park

Date Issued: Valid Until:

Parks Canada mike smallwood, Parks Canada

Avalanche Forecast

Sat Apr. 27th ยท 8:11AM

Alpine

Danger Ratings Below Threshold

Treeline

Danger Ratings Below Threshold

Below Treeline

Danger Ratings Below Threshold
Loose Wet Loose Wet
Storm Slabs Storm Slabs

Alpine

Danger Ratings Below Threshold

Treeline

Danger Ratings Below Threshold

Below Treeline

Danger Ratings Below Threshold

Alpine

Danger Ratings Below Threshold

Treeline

Danger Ratings Below Threshold

Below Treeline

Danger Ratings Below Threshold

The danger will increase during the day especially during breaks in the cloud. Be wary of overhead cornices.

Weather Forecast

Mostly overcast this morning with flurries, clearing this evening. Expect the sun to be very strong during any breaks in the cloud. Freezing level remaining around 1400m today before falling below valley bottom tonight with strong NE winds. Clearing Sunday with freezing level rising to 1800m.

Snowpack Summary

Up to 10cm new snow fell last night and now sits on a melt freeze crust at treeline and below as well as solar aspects in the alpine. Isothermal snow lives below these surface crusts. Total storm snow this week now over 60cm in the high Alpine, N-NE aspects will have retained the driest snow.

Avalanche Summary

Several loose wet avalanches to size 2 were observed from both N and S aspects yesterday. A very large size 4 was observed at the south end of the park, starting as a size 2 storm slab and stepping down to glacial ice. Last Saturday, skiers triggered a size 2.5 slide on the Youngs Peak headwall.

Confidence

Problems

Loose Wet

Loose Wet

Overcast skies this morning will slow daytime warming today but the new snow will likely break down quickly. Expect the sun to affect the snow rapidly during any breaks in the cloud and clearing this afternoon.

  • Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.
  • Use extra caution on slopes if the snow is moist or wet.

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

Elevations: Treeline, Below Treeline.

Likelihood

Likely - Possible

Expected Size

1 - 2.5
Storm Slabs

Storm Slabs

60cm of storm snow has accumulated in the high alpine over the last week. Recent storm slabs are susceptible to human triggering given the right terrain feature. Slabs seem most reactive on solar aspects, where they sit on a melt-freeze crust.

  • If triggered the storm slabs may step down to deeper layers resulting in large avalanches.
  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1 - 2.5