Avalanche Forecast
Issued: Nov 23rd, 2019 3:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs and Persistent Slabs.
ghelgeson,
Avalanche Canada
Strong southwest wind combined with up to 20 cm of new snow is expected to form wind slabs which will be most problematic near ridge crest. The weak & highly variable snowpack will likely need time to adjust. Conservative terrain selection is prudent Sunday.
Summary
Confidence
Low - Uncertainties in both the snowpack structure and the weather forecast limit our confidence.
Weather Forecast
Saturday Night’s storm should offer the Purcells (especially the northern section) a nice re-fresh before we move into a period of high pressure next week.
SATURDAY NIGHT: Freezing level around 1100 m, moderate to strong west/southwest wind, 5 to 20 cm of snow possible.
SUNDAY: Broken cloud cover, freezing level around 1100 m, light to moderate northwest wind, 1 to 5 cm of snow possible.
MONDAY: Broken cloud cover, freezing level around 700 m, light variable wind, trace of snow possible.
TUESDAY: Scattered cloud cover, freezing level at valley bottom, calm, no significant precipitation expected.
Avalanche Summary
No recent avalanche activity has been reported. A natural avalanche cycle is possible late Saturday Night into Sunday as strong southwest wind and up to 20 cm of snow is forecast.
Snowpack Summary
Winter is slowly creeping down to the valley, but avalanche hazard is largely confined to the alpine at this time. Snowpack depths range from 10 to 100 cm. The young snowpack is higly variable due to previous wind transport and areas of shallow snow which are highly faceted. Most treeline and below treeline areas are probably below threshold for avalanches at this time. A pottentially problematic melt freeze crust from late October can be found above basal facets in the lower snowpack. There's a great summary of current conditions in the Golden area here.
Problems
Wind Slabs
Alpine elevations in the North of the region could see as much as 20 cm of new snow by Sunday morning combined with strong southwest wind. This is expected to form wind slabs which will likely be most prevalent immediately lee of ridge crest.
Aspects: All aspects.
Elevations: Alpine.
Likelihood
Expected Size
Persistent Slabs
Very little is known about some of the crusts in the lower snowpack at this time, but current riding conditions are likely to push folks into the alpine where there is potential for riders to initiate avalanches failing on one of the more deeply buried crusts.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Nov 24th, 2019 5:00PM
