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Avalanche Forecast

Archived

Apr 24th, 2019–Apr 25th, 2019

Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.
Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.
Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.

Regions

Little Yoho.

One more nice day in the forecast for Thursday before a significant spring upslope drops 30-40 cm over the eastern slopes through the weekend. Avalanche hazard will rise starting Friday.

Weather Forecast

One more nice day on Thursday before a significant upslope storm begins to affect the region from the east side. Thursday will be a mix of sun and clouds with freezing levels to about 2000m - after that the winds switch to the NE on Friday, temperatures drop and upwards of 30 cm is expected by Saturday.

Snowpack Summary

Last week's storm snow has now settled but has been blown into windslabs by moderate to strong westerly winds in alpine areas - caution advised in leeward areas and where these slabs overlie buried sun crusts. Surface crusts or moist snow exist at lower elevations and on solar aspects depending on the time of day.

Avalanche Summary

No new avalanches have been observed or reported, but observations have been limited.

Confidence

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.