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Avalanche Forecast

Archived

Apr 18th, 2022–Apr 19th, 2022

Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Jasper.

8-12cm of snow is expected Tues to Wed am with a few hours of gusting 45km/hr winds Tuesday evening. This may be just enough to increase the alpine hazard for Wednesday yet models are uncertain. Choose routes that avoid Cornices as  overhead hazard.

Weather Forecast

Monday night will be cloudy, clear periods, flurries, trace of snow, -5C, and light winds. By Tuesday evening we may get 8cm thus expect clouds, 15 gusting 45km/hr West winds, and -4C. Wednesday may be clouds, sun, flurries, trace of snow, -10 to -4C, 1700m freezing level, and light SE wind. Check Avalanche Canada MWF for weather updates.

Snowpack Summary

Wind effected surface snow on all aspects from recent variable winds with scouring on windward ridge features. Isolated wind slabs and cross loaded pockets exist in the alpine and have bonded well to the previous surface. A variety of temperature crusts are present in the upper snowpack at all elevations and aspects except N-NE high alpine.

Avalanche Summary

No field patrol on Monday and nothing new reported. Sunday's Maligne patrol observed no new avalanche activity. On Saturday we observed a few loose dry steep solar aspects alpine up to size 1. Two cornice failures were noted on the Churchill range from Thursday and Tuesday. Please consider submitting a MIN report if you observe any new activity.

Confidence

on Tuesday

Problems

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.