Banff Yoho & Kootenay National Park Avalanche Forecast
Issued: Apr 29th, 2021 4:00PM
A poor freeze overnight Thursday extending above tree line elevations will place us in the 'All Melt, No Freeze' Spring conditions scenario through Friday.
Click the "More Spring Conditions details" link for more info.
Freezing levels area approaching 2600m Thursday afternoon and are expected to remain at a similar level through the night as SW winds increase to strong. Clearing, with some associated cooling, early Friday morning holds the best potential for a weak freeze at treeline elevations. Light snowfall at treeline elevations is expected Friday afternoon .
Poor overnight crust recovery, weak crusts on all aspects up to 2000m with moist snow up to 2500m with light rain in some areas Thursday. 10-20cm of settled dry snow in high Northerly terrain. Isolated pockets of wind slab may exist in the alpine.
No new avalanche activity observed or reported for the past few days however temperatures are climbing higher than they have been for a week. We had limited observations today with limited visibility and no field trip.
A poor surface crust recovery and the potential for afternoon showers up to treeline Friday will allow surface snow to become reactive over buried crusts. Deeper wet snow can be expected at lower elevations where buried crusts may break down as well.
- Use extra caution on solar slopes if the snow is moist or wet.
Elevations:Treeline, Below Treeline.
As temperatures rise, the snowpack becomes more sensitive and brings concern for slab avalanches. While the main concern is for wet snow to react as slabs over crusts at lower elevations, there is also potential for dry slabs on shaded alpine slopes
- If triggered loose wet sluffs may step down to deeper layers resulting in larger avalanches.
Winds and temperatures will both remain elevated into Friday and with this there is some added concern for cornice failure. While these have their own destructive potential, perhaps the greater concern here is that they trigger deeper slabs as well.
Valid until: Apr 30th, 2021 4:00PM
The latest forecast danger ratings, broken down to elevation. See how an elevation is trending.