Dashboard Regions Weather Stations Radar Alerts Glossary
Contact About
Log In

Register for an account and never miss a forecast again!

Register

Avalanche Forecast

Archived

Mar 22nd, 2022–Mar 23rd, 2022

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Glacier.

March continues to deliver snow with 120cm falling in the last 10 days at Mt. Fidelity (1900m), ~15cm forecasted for Wednesday and our height of snow is still above 4m!

Weather Forecast

The Inclement spring weather continues with more precipitation, warm temperatures, and gusty winds forecasted for Wednesday! A cold front will pass over Rogers Pass Wednesday afternoon, dropping ~15mm of precipitation, and strong South-Westerly winds. The Fl will rise to ~2000m in advance of the front, then fall to ~ 500m subsequently overnight.

Snowpack Summary

March keeps delivering with ~35cm of new snow at TL in the last 4 days, and ~ 120cm in the last 10! Some wind and warm temperatures coupled with the new snow will likely form soft slabs in the Alpine and exposed areas of TL. The Mar 11 sun crust is buried 50-70cm. On shaded aspects, small surface hoar may be buried down ~80cm (March 7).

Avalanche Summary

No new natural activity was observed in the HWY corridor on Monday. One size 1 soft slab was noted off Mt Cheops near Balu Pass on a E aspect ~2000m, ~15cm deep, 8m wide, and ran 15m in length. On Sunday, several slab avalanches up to size 2.5 were observed from steep terrain along the HWY corridor, likely being triggered by the strong South winds.

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.