The avalanche danger is variable and can range from Low to High. Travelling early in the day is recommended, as conditions can change rapidly in short periods of time due to daytime warming. Pay careful attention to the integrity of surface crusts formed overnight and rising air temperatures during the day. Dry slab avalanche danger may also exist during spring snow storms. More Spring Conditions details.
Loose wet avalanches are occurring on all aspects and elevations during the warmest parts of the day, especially when the sun comes out. Some of these are also triggering wet slabs. Plan your trip to be out of any big terrain before things heat up!
Wet slab avalanche activity will taper off with cooling and increase during hot periods of the day, with large triggers like cornices or when there is no overnight refreeze. The deep facets will remain a problem through the spring season.
Cornices have taken quite a hit with the recent heat. Many are cracked and slowly peeling off of ridges. These should be considered suspect as they will likely fail in the coming weeks.
Deep persistent slabs are best managed by:
Cornices are best managed by:
Some helpful weather links:
Remote weather stations in Banff, Yoho & Kootenay - Real time, raw, actual weather data.
Avalanche Canada Mountain Weather Forecast - Good for getting an overview of the major weather systems.
SpotWx - Good for a localized forecast
Environment Canada Yoho forecast - Simplified valley bottom forecast for Lake Louise area.
Isothermal snow exists at lower elevations. Crusts formed during clear cool nights will break down quickly with solar inputs. Expect moist surface snow to mountain top in the afternoon with the exception of high elevation North slopes. The basal facet weakness persists at treeline and above and is reactive to large triggers or warm temperatures.
In general, avalanche hazard will be greatest during hot sunny days or warm rain. This has the potential to trigger smaller loose wet avalanches and larger wet slab avalanches on the basal weak layer. For current avalanche activity and observations, check out the Mountain Conditions Report