Lizard Range and Flathead Avalanche Forecast

Issued: Apr 13th, 2021 4:00PM

Wed Apr 14th Current Conditions
Alpine Moderate Treeline Low Below Treeline Low
Thu Apr 15th 2 Day Outlook
Alpine Moderate Treeline Moderate Below Treeline Low
Fri Apr 16th 3 Day Outlook
Alpine Considerable Treeline Considerable Below Treeline Considerable

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

Plan your day around avoiding sun exposed slopes and lingering wind slabs.

Danger will progressively increase as the days get warmer and sunnier. Read more in this Forecasters' Blog.

Summary

Confidence

High -

Weather Forecast

TUESDAY NIGHT: Clear skies, 40 km/h northeast wind, freezing level drop to valley bottom with treeline temperatures dropping to -5 C.

WEDNESDAY: Mix of sun and cloud, 40 km/h northeast wind, freezing level to 1800 m with treeline temperatures around -1 C.

THURSDAY: Sunny with a few clouds, light northeast wind, freezing level climbing to 2200 m with treeline temperatures reaching +3 C.

FRIDAY: Sunny, light northeast wind, freezing level climbing to 2600 m with treeline temperatures reaching +6 C.

Avalanche Summary

No new avalanches have been reported since the weekend. On Sunday a few size 1-1.5 human triggered slab avalanches were reported, including a storm slab on a north-facing convexity at treeline near Corbin and a 30 cm thick natural slab avalanche on a steep east-facing slope in the Lizard Range.

Snowpack Summary

North alpine terrain has roughly 30 cm of settling powder with wind slabs possible on steep exposed slopes. Other terrain is undergoing a melt-freeze cycle with successive days of warm sunny weather. The snowpack is overall strong and settled, although intense warming later this week could potentially weaken deeper layers in shallow rocky terrain. The snow line is slowly creeping up the mountains to roughly 1400 m in elevation. 

Terrain and Travel

  • Back off slopes as the surface becomes moist or wet with rising temperatures.
  • Carefully evaluate steep lines for wind slabs.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

Problems

Loose Wet

An icon showing Loose Wet

Likelihood

Possible-Likely

Expected Size

1 - 1.5

Expect natural wet loose avalanches to occur on solar aspects when the sun comes out.

Aspects:

East, South East, South, South West, West.

Elevations:

All elevations.

Cornices

An icon showing Cornices

Likelihood

Unlikely-Possible

Expected Size

2 - 2.5

Strong solar radiation and warming may trigger the large cornices that hang over ridgelines.

Aspects:

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

Elevations:

Alpine.

Wind Slabs

An icon showing Wind Slabs

Likelihood

Unlikely-Possible

Expected Size

1 - 2

Watch for pockets of unstable snow on steep exposed slopes.

Aspects:

All aspects.

Elevations:

Alpine.

Valid until: Apr 14th, 2021 4:00PM

Forecast Trend

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