Wind Slabs
N
NE
E
SE
S
SW
W
NW
- Alta montaña
- Límite del bosque
- Bajo el límite del bosque
- Probabilidad
- Possible - Likely
- Tamaño
- 1–2
Expect to find fresh wind slabs reactive to human triggers below alpine ridgetops.
Boletín de aludes
Ver en el mapaSouth Coast
Apr 12 – 13, 2017Avalanche Canada
Archivado · caducó 9 years ago
Peligro de aludes
Fri
Sat
Alta montaña
3 · Notable
Límite del bosque
2 · Moderado
Bajo el límite
1 · Débil
Lo esencial
New snow and shifting wind directions may create wind slabs on a variety of aspects, including slopes that are generally windward.
Problemas de aludes
Cornices
NNEESESSWWNW- Alta montaña
- Límite del bosque
- Bajo el límite del bosque
- Probabilidad
- Unlikely - Possible
- Tamaño
- 1–3
Recent snow and wind are growing already large cornices. Minimize your exposure to cornices when it is cold and completely avoid them when it is warm and/or sunny.
Loose Wet
NNEESESSWWNW- Alta montaña
- Límite del bosque
- Bajo el límite del bosque
- Probabilidad
- Possible
- Tamaño
- 1–2
Rain at lower elevations has led to a gradual break down of surface crusts and has contributed to wet snow sluffing and gathering mass in steep terrain.
Confidence
Moderate - Timing, track, or intensity of incoming weather system is uncertain
Weather Forecast
THURSDAY: 5-10 mm of rain or 5-10 cm of snow above roughly 1100m. Light Southwesterly ridgetop winds. Freezing level around 1200m.FRIDAY: Mostly cloudy with isolated flurries. Light Southwesterly ridgetop winds. Freezing level around 1200 m.SATURDAY: Sunny. Light southwesterly ridgetop winds. Freezing level around 1500m.
Avalanche Summary
On Thursday the main concern will be wind slabs below alpine ridgetops. At tree line expect small loose wet avalanches in steep terrain if the sun appears for any length of time. Saturday's fatal avalanche on Mt Harvey (near Lion's Bay) was the result of people being on a cornice that failed. A large avalanche was subsequently triggered by the multi-ton snow boulders hitting the slope below.
Snowpack Summary
15-25 mm of precipitation is forecast to fall as snow above roughly 1200 m and as rain below on Wednesday. This means snow in the alpine, rain/snow at treeline, and rain below treeline. Strong southeast winds are expected to accompany the storm and create fresh wind slabs on lee features in the alpine which may be reactive to human triggers. The mix of rain and snow at treeline elevations may create the possibility of loose wet avalanches. Below treeline, rain has saturated an already wet, isothermic snowpack. Cornices are large in some areas and could trigger large avalanches when they fail. Additionally, cornices present a falling hazard and should be given a wide berth while traveling on ridgetops.