Persistent Slabs
N
NE
E
SE
S
SW
W
NW
- Alpin
- Limite forestière
- Sous la limite forestière
- Probabilité
- Possible - Likely
- Taille
- 1.5–3
Rising freezing levels and large triggers like smaller avalanches may wake up deeper slab instabilities
Bulletin d’avalanche
Voir sur la carteJasper
Mar 13 – 14, 2018Parks Canada
Archivé · expiré 9 years ago
Danger d’avalanche
Thu
Fri
Alpin
4 · Fort
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
Points saillants
Highway 93 south of Jasper to Saskatchewan crossing and the Maligne road remain closed for avalanche control
Problèmes avalancheux
Loose Dry
NNEESESSWWNW- Alpin
- Limite forestière
- Sous la limite forestière
- Probabilité
- Very Likely
- Taille
- 1–2.5
More shaded aspects and elevations above the freezing level.
Loose Wet
NNEESESSWWNW- Alpin
- Limite forestière
- Sous la limite forestière
- Probabilité
- Likely - Very Likely
- Taille
- 1–2.5
solar aspects and elevations below the freezing level
Weather Forecast
Strong high pressure with southern warm air will continue to Wednesday evening with freezing levels close to 3000m and strong solar effect throughout the forecast zone. Wednesday night/Thursday brings cloud cover and more seasonable temperatures with light flurries, a change that persists into the weekend.
Snowpack Summary
Our structurally weak snowpack is slowly warming under spring-like temps and strong solar radiation. Settlement and sintering is occurring in the upper snowpack with warmer temps and melt-freeze crusts forming on steep solar slopes. Mid and lower snowpack weaknesses persist but tend to be reactive only on alpine solar facing slopes.
Avalanche Summary
Warm temps and rising freezing levels are resulting in loose dry avalanches at upper elevations and loose wet avalanches on solar slopes below treeline. Avalanches below treeline are to size 2. Alpine slopes have also released as slabs to midpack and have entrained snow up to size 2.5, but have potential to size 3.
Confidence
Due to the number and quality of field observations