Monday February 12, 2018
Travel & Terrain Advice
Slip and fall hazard will persist. New snow is expected to form wind slab on all north aspects. Manage terrain to avoid features such as convex rolls, terrain traps such as cliffs, and other areas with significant wind loading.
No new natural avalanches observed or reported.
South west wind and new snow beginning Tuesday evening will promote the formation of wind slab. Found in both the alpine and tree line, these slabs will be located on north aspects. Initially the new snow will come in cold, however near storms end, the temperatures will rise slightly encouraging the slab to densify becoming touchy to triggering from skier traffic. Expect these avalanches to have the potential to be large , size two.
Surface hoar can be found on isolated features protected from both the wind and sun. A robust melt freeze crust up-to thirty cm in thickness can be found on all aspects and observed to 1800 m. This melt freeze crust is bridging or capping the snow pack and provides a reliable indicator of current snow pack stability. During daytime warming, this crust began to slightly break down with moist surface conditions reported on direct solar aspects only. Mid and lower snow pack continues to strengthen and is well settled.
|Surface||surface hoar on isolated protected areas|
|Upper||20-30 cm melt freeze crust|
Cool and clear conditions have continued to settle and strengthen the snow pack. Reports indicate small surface hoar located in isolated areas protected from both the sun and wind have been observed. Melt freeze crust can be found to 1800 meters and is suspect to have reached above this elevation.
A ridge of high pressure will continue to deliver conditions that remain cool and clear with light to moderate north west wind. Late Tuesday a moderately strong low pressure will deliver up-to 10 cm of new snow with light to moderate south west wind.
Monday Clear no new snowfall temps -7 to -3, winds light to moderate Nw, freezing level 0 m rising to 900 m mid day
Tuesday Clear becoming overcast early pm, no new snowfall temps -6 rising to 0, winds light Nw becoming Sw late pm, freezing level 0 m rising to 900 m mid day.
Wednesday overcast,then clearing late am 10 cm of overnight snowfall , temps - 6 to 0 , winds light to moderate Sw becoming Light Nw late in the afternoon, freezing level 300 m rising to 800 m.
Posted on Monday February 12, 2018 by Jesse Percival