Wind Slabs
N
NE
E
SE
S
SW
W
NW
- Alpin
- Limite forestière
- Sous la limite forestière
- Probabilité
- Possible - Likely
- Taille
- 2–3
Recent winds have created wind slabs in the lee of alpine features.
Bulletin d’avalanche
Voir sur la carteBanff Yoho Kootenay
Feb 12 – 13, 2015Parks Canada
Archivé · expiré 12 years ago
Danger d’avalanche
Thu
Fri
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
Points saillants
The natural cycle has slowed down, but the potential for triggering large avalanches is a very real possibility. Watch for how much freeze you get below treeline Thursday, the snow is isothermal below. SH
Problèmes avalancheux
Storm Slabs
NNEESESSWWNW- Alpin
- Limite forestière
- Sous la limite forestière
- Probabilité
- Possible - Likely
- Taille
- 2–3
50 to 90 cm of storm snow exist on the January 30th crust interface. A poor bond exists at this interface and large avalanches have been observed running on this layer. Huge propagations are still possible.
Deep Persistent Slabs
NNEESESSWWNW- Alpin
- Limite forestière
- Sous la limite forestière
- Probabilité
- Possible
- Taille
- 2–3
The base of the snowpack remains weak due to basal depth hoar/facets. Initiation of a wind slab or a storm slab may step down to trigger large to very large avalanches in thin snowpack areas.
Weather Forecast
Trace amounts of snow on Thursday, cloudy conditions and freezing levels up to 1700m. There should be a mild overnight freeze below treeline.
Snowpack Summary
45-70 cm of recent storm overlies a crust from January 30th. The recent precipitation and warmer temperatures have created touchy storm slabs and wind slabs over top of the Jan. 30th interface. The basal facet/depth hoar layers are still active in shallow snowpack areas. A weak freeze below treeline is barely holding isothermal conditions at bay.
Avalanche Summary
Avalanche control over the past four days in Banff, Yoho Park and Kootenay Park have produced numerous avalanches up to size 3 over the last 4 days. Most of the avalanches started dry and turned wet at lower elevations. Also, evidence of a widespread cycle up to size 3.5 throughout the forecast region. Some avalanches running close to full path.