Wednesday April 10, 2019

Friday April 12, 2019
Thursday April 11, 2019
Wednesday April 10, 2019
Confidence: High - Many days of field data and weather models in agreement

Main Concerns

Wind Slab - view Avalanche Problems for detailed information.

Travel & Terrain Advice

Avoid lee (wind loaded NW-N-NE) slopes in the alpine and open treeline Thursday into Friday.

Avalanche Summary

Numerous small loose wet avalanches up to size 1 have been reported over the past three days (many pinwheeling from steep rocky solar facing bluffs at treeline and tree bomb point releases below treeline) as things warmed up Tuesday.

Avalanche Problems

Wind Slab

Moderate snow fall up high Thursday into Friday morning will be accompanied by moderate south winds. These winds will transport snow and likely form wind slabs on lee (NW-N-NE) slopes in the alpine and treeline elevation bands. The potential to trigger these slabs will be in the possible to likely range with human activity and unlikely to possible with natural triggers resulting in avalanches up to size 2.

Snowpack Summary

A few small flurries of moist snow mixed with sunny breaks since the big storm event last weekend.

Snowpack Details

SurfaceSome new warm snow 2-6 cm (falling Wednesday morning)
Upperbreakable crust over the 35-80 cm of moist storm snow from last weekend
Midan old weakening crust over well settle snow
Lowerwell settled

Past Weather

Since the big storm last weekend, small snow flurries have left 2-6 cm of new snow over crusts that formed during sunny breaks Sunday and Tuesday.

Weather Forecast

Treeline and above will see some small flurries Wednesday with a moderate snow storm Thursday into Friday morning.

Wednesday - 2 to 6 mm of precip, temps -2 to 1, winds light SW, freezing level 1000 to 1500 m.

Thursday - 7 to 12 mm of precip, temps -3 to 1, winds moderate from the S, freezing level 1000 to 1500 m.

Friday - 0 to 3 mm of precip, temps -1 to 1, winds light SW, freezing level 1000 to 1500 m.

Posted on Thursday April 11, 2019 by Bill Phipps

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