Wind Slabs
N
NE
E
SE
S
SW
W
NW
- Hochgebirge
- Waldgrenze
- Unterhalb der Waldgrenze
- Wahrscheinlichkeit
- Possible - Likely
- Größe
- 1–3
Recently easterly outflow winds may have created fresh wind slabs in exposed terrain.
Lawinenlagebericht
Auf der Karte ansehenNorthwest Coastal
Mar 18 – 19, 2016Avalanche Canada
Archiviert · abgelaufen 11 years ago
Lawinengefahr
Sun
Mon
Hochgebirge
2 · Mässig
Waldgrenze
2 · Mässig
Unterhalb
1 · Gering
Kernpunkte
Extra caution is needed in areas in the northern part of the region where buried persistent weaknesses remain active.
Lawinenprobleme
Cornices
NNEESESSWWNW- Hochgebirge
- Waldgrenze
- Unterhalb der Waldgrenze
- Wahrscheinlichkeit
- Possible
- Größe
- 2–5
Natural cornice releases are possible with sun exposure and warming. A falling cornice chunk could trigger a large slab on the slope below.
Persistent Slabs
NNEESESSWWNW- Hochgebirge
- Waldgrenze
- Unterhalb der Waldgrenze
- Wahrscheinlichkeit
- Unlikely - Possible
- Größe
- 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
Weather Forecast
SATURDAY: Mainly cloudy. The freezing level dips to 1300 m. Winds should be moderate from the S-SE. SUNDAY: Cloudy with a chance of flurries. The freezing level spikes back to 1600-1800 m and winds are light to moderate from the east. MONDAY: Cloudy with light snow. The freezing level is around 1200-1400 m and winds are light.
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 one observer reported triggering storm slabs up to 20 cm deep (size 1-1.5) on north-facing slopes.
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.