Avalanche Forecast

Issued: Apr 2nd, 2019 3:00PM

The alpine rating is below threshold, the treeline rating is below threshold, and the below treeline rating is below threshold. Known problems include Deep Persistent Slabs and Loose Wet.

Alberta Parks mike.koppang, Alberta Parks

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Early starts and finishes are key at this time of year.  Some dry snow on high north aspects and corn (if you get the timing right) on the rest!

Summary

Confidence

-

Weather Forecast

A spring pattern has been established these last few weeks.  Cool mornings and hot days are now the norm with afternoon temperatures well above freezing.  Upslope storms may occur as well as rain which can rapidly load the snowpack.  If there is a major change in the snowpack, this bulletin will be updated more frequently.  Until then, avalanche bulletins will only be updated as needed.  Early starts are key at this time of year.

Avalanche Summary

Wet slides either in the form of slabs or loose are occuring daily with the temperature increases.  In general we are seeing slides mainly in the sz 2 range but large avalanches are possible due to the deeper weak layers.  Always be thinking about consequence as you travel. 

Snowpack Summary

Spring is here it would seem!  The snowpack varies in its stability depending on a number of different factors.  Day time high, quality of freeze overnight, aspect and influx of new load from snow or rain.  In general, as temperatures warm up, stability will decrease.  These decreases will be most apparent on solar aspects where the radiation is strong.  The timing on this decrease will vary but can be affected by overnight freeze and aspect.  Poor freezes mean, avalanche danger will increase quickly with warming.  Northern aspects are still holding some dry snow at upper elevations but expect a battle up and down from there. The deep persistent weak facets will be with us until the snow is gone.  Be sure to asses this layer as you travel.  Some good corn is out there if you can get the timing right!!  Start Early and be home early and avoid the heat of the day

Problems

Deep Persistent Slabs

An icon showing Deep Persistent Slabs
Loose wet slides may step down to deeper layers and involve the entire snowpack. 
Be aware of thin areas that may propogate to deeper instabilites.Be aware of the potential for full depth avalanches due to deeply buried weak layers.Be aware of the potential for wide propagations due to the presence of hard windslabs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

2 - 3

Loose Wet

An icon showing Loose Wet
Loose wet slides are occurring in the upper snowpack.  These may step down to deeper layers
Avoid sun exposed slopes when the solar radiation is strong, especially if snow is moist or wet.Use extra caution on solar slopes or if the snow is moist or wet.

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

Elevations: All elevations.

Likelihood

Likely - Very Likely

Expected Size

1 - 2

Valid until: Apr 3rd, 2019 3:00PM

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