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Stick to "Sheltered" Terrain
Location Name:
McGee Creek
Observation date:
Saturday, December 11, 2021 - 03:00
Is this an Avalanche Observation:
No
Observation made by:
Public
Tabs
Quick Observation
Braved the storm today in the Apgar Mountains
4-5 inches of new snow measured on Mark's remnant skin track from yesterday at 8:00am
Widespread blowing snow and wind effected snow surfaces observed at all elevations above about 4500'
Winds were swirling and blowing strong from all directions most of the day. Strongest gusts observed were blowing out of the SE predominantly. We estimate these gusts were 40+ mph.
The unsettled weather was rapidly deteriorating snow stability, so we opted to keep our travel confined to heavily sheltered lodgepole trees on slopes that were at or below about 30 degrees. The violent winds still penetrated this forest, that on most days would offer quite a bit of protection.
The wind affected snow in the trees was quite dense and prooved helpful for staying on top of a shallow snowpack to link enjoyable turns. However there was definetly a lot of "near surface boosh" and cautious skiing was a must.
It was difficult to measure the amount of new snow that fell during the day. The variability was extreme due to the winds and also the fact that the new snow fell on top a soft unconsolidated snow surface. We guess that about 8 inches fell above 5000' as of 2:00pm
Based on periodic ski pole probes along our skin track. We believe that there is almost no basal ice layers (snow/rain crust that fell prior to Dec 4) present below 5700' on southerlies.
We dug a snowpit at 6119' on a SSE slope. Stability test pointed to a reactive layer 35cm above the ground as our cheif problem. This failure plane was about 4cm below the freezing rain crust that Mark identified yesterday and was propagating on top of weak faceted snow. We also noted that warm temps and wind have deposited the most recent snow "upside down" unfortunately.
Snowpack, Avalanche, Weather Images:
Travel Details
Region:
Glacier National Park - Apgar Range
Activity:
Skiing
Snowpack Details
Snowpack and Weather Details:
Terrain
Elevation of observation:
3500-5000 ft
Aspect(s) of observation:
SE
S
Red Flags:
Shooting cracks
More than a foot of new snow or heavy snowfall rates (>1"/hr)
Blowing snow
Persistent Weak Layers:
Facets or Faceted Crust
Buried
New Snow in the past 24 hours:
8.00in.
Total Snow Depth:
77
Blowing Snow:
Intense
Wind Speed:
Strong (Whole trees in motion)
Wind Direction:
Southeast
Air temperature:
Below Freezing
Sky Cover:
Overcast (OVC)
Highest Precipitation Rate:
Moderate Snowfall (S2)