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Avalanche Forecast

Apr 3rd, 2013–Apr 4th, 2013
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Sea To Sky.

Confidence

Fair - Freezing levels are uncertain

Weather Forecast

Synopsis: The first in a series of frontal systems will reach the South Coast on Thursday afternoon spreading moderate to heavy precipitation through Saturday morning. Thursday: Increasing cloud with precipitation developing in the afternoon. 15-20 mm expected overnight. The freezing level is around 2000 m. Winds increase to moderate of strong from the southwest. Friday: Moderate to heavy precipitation – 20-30 mm. The freezing level drops to around 1600 m and winds are moderate to strong from the southwest. Saturday: Precipitation should ease off during the day and the freezing level continues to gradually drop.

Avalanche Summary

No new avalanches were reported on Tuesday. Recent avalanche activity primarily involved loose wet sluffs up to size 2 on sun-exposed slopes, and isolated cornice failures.

Snowpack Summary

Recent warm temperatures have created melt freeze conditions on all aspects below 2000m and to mountain top on south and west facing terrain. Isothermal conditions as deep as 100cm have been reported on south aspects at lower elevations. On high north-facing slopes surfaces are well settled and surface hoar development continues in some areas. Cornices are huge and potentially unstable.Mid and lower snowpack layers are well bonded.

Avalanche Problems

Cornices

Cornices are large and weak. Daytime warming and/or direct sunshine could cause large and destructive cornices to fail.

Aspects: North, North East, East, South East.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 2 - 6