Cornices
N
NE
E
SE
S
SW
W
NW
- Alpine
- Treeline
- Below treeline
- Likelihood
- Very Likely
- Size
- 1.5–3
All cornices should be considered unstable. Give them a wide berth and don't end up below them.
Avalanche forecast
View on mapJasper
Apr 28 – 29, 2018Parks Canada
Archived · expired 8 years ago
Avalanche danger
Mon
Tue
Alpine
No rating
Treeline
No rating
Below
No rating
Highlights
Avalanche problems
Persistent Slabs
NNEESESSWWNW- Alpine
- Treeline
- Below treeline
- Likelihood
- Likely - Very Likely
- Size
- 1.5–3.5
With warm temperatures and solar radiation these events are occurring. Cornices falling are acting as triggers. These events can run far into the valley below
Loose Wet
NNEESESSWWNW- Alpine
- Treeline
- Below treeline
- Likelihood
- Very Likely
- Size
- 1–3
With most of the snowpack below 1,900m being isothermal expect these avalanches to start early on solar slopes at all elevations. Incoming precipitation may be rain adding to this problem.
Weather Forecast
Saturday night will be wet flurries, 6cm of snow, -3 degrees, light North wind, and 1800m freezing level. There may be a weak temperature inversion Saturday night and Sunday. Sunday will be flurries, 8cm of snow, high of -3, light E winds, and 1900m freezing level. Monday will be sun and cloud, no precipitation, and 2300m freezing level.
Snowpack Summary
Moist/wet snow extends to treeline on all but the most Northerly slopes. Persistent slabs are on most aspects at treeline and above. They have been reactive to triggers like cornice falling and larger loose wet avalanches. Below 2200m the snowpack is isothermal as there has been no overnight freeze except for Northerly aspects.
Avalanche Summary
The spring avalanche cycle is in full swing with temperatures reaching 17 degrees. Large destructive avalanche are running from all elevations and going far into the valley bottom.