Wind Slabs
N
NE
E
SE
S
SW
W
NW
- Alta quota
- Limite del bosco
- Sotto il limite del bosco
- Probabilità
- Possible - Likely
- Dimensione
- 1–3
Recently easterly outflow winds may have created fresh wind slabs in exposed terrain.
Bollettino valanghe
Vedi sulla mappaNorthwest Coastal
Mar 19 – 20, 2016Avalanche Canada
Archiviato · scaduto 11 years ago
Pericolo valanghe
Mon
Tue
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
In sintesi
Extra caution is needed in areas in the northern part of the region where buried persistent weaknesses remain active.
Problemi valanghivi
Cornices
NNEESESSWWNW- Alta quota
- Limite del bosco
- Sotto il limite del bosco
- Probabilità
- Possible
- Dimensione
- 2–5
Natural cornice releases are more likely during periods of sun exposure and warming. A falling cornice chunk could trigger a large slab on the slope below.
Persistent Slabs
NNEESESSWWNW- Alta quota
- Limite del bosco
- Sotto il limite del bosco
- Probabilità
- Unlikely - Possible
- Dimensione
- 3–6
Persistent weaknesses have recently been reacting to cornice triggers in the northern part of the region. Keep these in mind if you're riding near Bear Pass or Ningunsaw Pass.
Confidence
Moderate - Due to the number of field observations
Weather Forecast
Light flurries and moderate southerly winds are forecast for Sunday and Monday. A mix and sun and cloud and light winds are expected on Tuesday. Freezing levels should sit at about 1300m for the forecast period.
Avalanche Summary
On Thursday, there were reports of natural and explosive-triggered cornice falls, primarily from areas north of Stewart and near Ningunsaw Pass. Many of these triggered persistent slabs with the largest results (size 3-3.5) occurring on NE-NW aspects. Observations from the southern part of the region were limited, but in the past few days there were a few reports of natural and human triggered storm slabs to size 2 just below ridgecrest in north facing alpine terrain.
Snowpack Summary
Easterly winds have redistributed the surface snow forming fresh wind slabs in exposed terrain. On sheltered and shady slopes there is 20-40 cm of settled dry (and faceting) powder, possibly capped by surface hoar. On south aspects, the recent storm snow may be sitting on a sun crust. Lower elevations and south aspects are going through daily melt-freeze cycles. A layer of surface hoar or melt-freeze crust buried on March 3 is down 70-100cm and has been recently reactive in the areas north of Stewart. An older crust/facet layer buried in early February can now be found down over a meter but this layer has been dormant for several weeks.