Cornices
N
NE
E
SE
S
SW
W
NW
- Alpine
- Treeline
- Below treeline
- Likelihood
- Likely
- Size
- 1.5–3
Rising temperatures are causing cornices to fall triggering slopes below. Give them a wide berth.
Avalanche forecast
View on mapJasper
Apr 24 – 25, 2018Parks Canada
Archived · expired 8 years ago
Avalanche danger
Thu
Fri
Alpine
No rating
Treeline
No rating
Below
No rating
Highlights
Avalanche control is planned for Parker ridge area in late afternoon on Wednesday. Check Alberta 511.
Avalanche problems
Persistent Slabs
NNEESESSWWNW- Alpine
- Treeline
- Below treeline
- Likelihood
- Likely
- Size
- 2–3
Triggering this slab would have serious consequences. Cornice failures are acting as triggers.
Loose Wet
NNEESESSWWNW- Alpine
- Treeline
- Below treeline
- Likelihood
- Likely
- Size
- 1–2.5
The next few nights and days will be progressively warmer increasing the probability of loose wet avalanches. Start and end early plus be vigilant of overhead hazard as these avalanches have been gaining mass and running far.
Weather Forecast
This week will be sunny and very warm. Wednesday will be 2600m freezing level but then rise up to 3500m Thursday and Friday.
Snowpack Summary
Sun or temperature crusts extend to treeline and into the alpine on southerly slopes. Persistent slabs can be found on most aspects at treeline and above. These have been reactive to large triggers like cornice failures. Below 1,900m the snowpack is going isothermal on a daily basis.
Avalanche Summary
Tuesday observed a few loose wet avalanches below treeling up to the low alpine. Also a couple of fresh size 2-2.5's slabs were noted in the alpine. The mountains are waking up with the rising temperatures.