Recent wind effect treeline and above combined with some incoming snow may keep the hazard elevated into the middle of the week. Monitor surface snow for slab conditions and use a probe to keep tabs on the strength of the mid and lower snowpack.
Summary
Weather Forecast
Following near treeline freezing levels and an expected warm, gusty, wave of precip Saturday night, temperatures should drop overnight with treeline temps only climbing to -5C values for Sunday under a weak, dirty ridge. Up to 10cm is expected to arrive with moderate winds at treeline Monday as the cool temperatures persist.
Snowpack Summary
20-40 cm of snow now sits above crusts to 1800m and all solar slopes. Recent moderate S-SW winds with strong gusts have formed slabs in lee areas. The snowpack is highly variable but in the 150cm average found at TL, a firm upper pack sits over a weak mid-pack of facets. In thin snowpack areas tests results are typically collapses near the ground.
Avalanche Summary
Numerous avalanches to size 2.5 occurred Thursday morning after the passing of the storm. Most appeared to be windslabs in lee or cross-loaded alpine areas, many of these failed on crusts seen on S and W aspects, a few notable examples of deep persistent slabs were seen on east and north aspects.
Confidence
Intensity of incoming weather systems is uncertain on Monday
Tim Haggarty,
Parks Canada
