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Archived

Avalanche Forecast

Nov 18th, 2012–Nov 19th, 2012
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
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
2: Moderate
The avalanche danger rating in the alpine will be moderate
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

Regions: Banff Yoho Kootenay.

A strong wet storm is headed onshore and looks like it will bring us moderate and possibly heavy snowfall depending on the exact track. This could create the first major avalanche cycle of the season. JBW

Weather Forecast

A strong southwesterly flow with a strong supporting jet will bring heavy precipitation to the southern Rockies. We may see as much as 20-30cm of snow. Winds will be very strong from the south west.

Snowpack Summary

First wave in a series of storms brought some light snowfall. Nov 6 crust is down 30. Windslabs in open areas. Expect up to 30 cm new by Tuesday.

Avalanche Summary

No new avalanches reoprted. Expect increase in avalanche activity within 24 hrs with new snow and wind.

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Monday

Avalanche Problems

Wind Slabs

Strong winds have begun to move snow creating some new slabs. If the strong storm coming onshore reaches us with the forecasted snowfall amount,  it will rapidly increase the danger.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 3

Persistent Slabs

Deep slabs size 2-3 have been noted on isolated steep alpine slopes over the past week. Failure plane was at the bottom of the snow pack on firn or glacier ice. Additional load and wind may be enough to create more avalanches of this nature.

Aspects: North, North East, East.

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3