Glacier National Park Avalanche Forecast
Nov 18th, 2019 8:00AM
The alpine rating is Storm Slabs., the treeline rating is , and the below treeline rating is Known problems include
The Winter Permit System will be in affect Wednesday, November 20th. Permits are required to enter Winter Restricted Areas.
Today: Unsettled weather between systems. Mainly cloudy with flurries. Treeline temp: High -3 °C. Ridge wind light SW. Fzl 1600m Tonight: A system passing just south of us will bring flurries (5-10cm). Treeline temp: low -5 °C. Light ridge wind. Fzl 1200m. A ridge of high pressure Tues will bring clearing skies, cooler temps, and northerly winds.
35-50cm of new storm snow overlies an early season snowpack, complete with a series of melt-freeze crusts throughout the height of snow. Moderate SW winds and mild temps have created a storm slab in alpine and tree-line lee features. These slabs, which sit atop a melt-freeze crust, are reported to be easily triggered by human loading.
The weekend storm brought a decent, early-season avalanche cycle. Human-triggered avalanches to size 2 were reported from the Asulkan Hut area. Numerous natural avalanches to size 2.5-3 were observed from Tupper, Macdonald, and Cheops.
Warm temps, up to 50cm of new snow, and moderate SW winds have created a reactive storm slab. This sits atop a melt-freeze crust, which is an ideal sliding layer for this avalanche problem.
- Use caution in lee areas. Recent wind loading has created wind slabs.
- The new snow will require several days to settle and stabilize.
Aspects:North, North East, East, South East, North West.
Valid until: Nov 19th, 2019 8:00AM