Avalanche Forecast
Issued: Mar 29th, 2018 4:18PM
The alpine rating is Storm Slabs.
, the treeline rating is , and the below treeline rating is Known problems includeNew snow and wind Thursday night and Friday will add to recent storm slabs that sit on a touchy crust/facet/surface hoar layer. Choose conservative terrain and be especially wary of wind-loaded areas and solar aspects.
Summary
Confidence
Moderate -
Weather Forecast
TONIGHT: Flurries. Accumulation 10-15 cm. Ridge wind moderate to strong, west. Alpine temperature near -6. Freezing level valley bottom.FRIDAY: Flurries. Accumulation 5-10 cm. Ridge wind moderate to strong, northwest. Alpine temperature near -10. Freezing level valley bottom.SATURDAY: Mostly sunny. Ridge wind light, west. Alpine temperature near -8. Freezing level 800 m.SUNDAY: Cloudy, flurries. Accumulation 2-4 cm. Ridge wind light, southwest. Alpine temperature near -8. Freezing level 700 m.
Avalanche Summary
A widespread natural avalanche cycle up to size 3.5 was reported on Tuesday and Wednesday following the storm on Tuesday. Storm slabs from 50 to 100 cm deep were reported on all aspects between 1700-2500 m. Southerly aspects were the most reactive with numerous large and very large (size 2.5 - 3.5) avalanches running on a recently buried crust. While the natural cycle has tapered off, human triggered avalanches remain likely at treeline and above where the touchy late-March crust/surface hoar layer exists.
Snowpack Summary
Approximately 60 to 100 cm of recent storm snow has fallen with moderate to strong winds from the south / west. The storm snow sits on a variety of old snow surfaces buried late-March that consist of: sun crusts at lower elevations and on south aspects, and older storm snow or wind slabs up high. Surface hoar layers have been reported on shaded aspects at higher elevations. Persistent weak layers from early January and mid-December are still being reported by local operators but are generally considered dormant.
Problems
Storm Slabs
All the new snow will take time to settle and stabilize. Storm slabs 60-100 cm thick have been especially touchy on southerly aspects where a crust has been buried by the recent storm snow as well as wind-loaded, high north aspects.
Use conservative route selection, stick to moderate angled terrain with low consequence.Avoid freshly wind loaded leeward and cross-loaded slopes
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Mar 30th, 2018 2:00PM