Parks Canada percy woods, Parks Canada

Glacier National Park Avalanche Forecast

Apr 23rd, 2019 8:01AM

The alpine rating is considerable, the treeline rating is moderate, and the below treeline rating is moderate. Known problems include Storm Slabs and Loose Wet.

Watch for stubborn storm slabs at alpine elevations. Take the time to evaluate the upper snowpack before entering your line.


Weather Forecast

Freezing level of 2000m, little in the way of precipitation and moderate SW winds is the forecast today. Flurries tonight with 6cm expected and freezing level down to 1400m. A mix of sun and cloud for Wednesday/Thursday with freezing level rising to 2100m on Thursday.

Snowpack Summary

5cm of wet snow overnight at 1900m, 6mm of rain at 1300m. Little to no overnight surface crust recovery below treeline. The snowpack is isothermal BTL and thin areas at TL. Expect pockets of storm slabs over crust on high S aspects and potentially dry snow can still be found on Northerly aspects in the high alpine.

Avalanche Summary

No new avalanches recorded or reported in the last 24hrs. A widespread avalanche cycle to size 3 occurred last Friday. On Saturday skiers remotely triggered a size 2.5 slide on the Youngs Peak headwall that 3 people were involved in. All three were unhurt in the slide.


Due to the number of field observations


Storm Slabs

An icon showing Storm Slabs


Likely - Possible

Expected Size

1 - 2.5

50 cm +/-of storm snow has accumulated in the high alpine over the last 5 days. Recent storm slabs are susceptible to human triggering given the right terrain features and increasing load.

  • Take the time to evaluate surface layer bond if venturing into the alpine.
  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.


All aspects.



Loose Wet

An icon showing Loose Wet


Possible - Unlikely

Expected Size

1 - 2

Rain to near treeline and no overnight freeze at 1900m. Expect moist point release slides this afternoon. Low elevation S aspects are rapidly melting back.

  • Use extra caution on slopes if the snow is moist or wet.


All aspects.


Treeline, Below Treeline.

Valid until: Apr 24th, 2019 8:00AM