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Today’s avalanche problems will be wind slab, persistent slab and dry loose, human triggered avalanches are unlikely. Triggering an avalanche in isolated or extreme terrain is still possible.
New snow this week has covered rocks and other hazards sitting just below the surface, even a small avalanche could have high consequences.
Riding conditions have improved dramatically in areas protected from the wind.
There were two human triggered avalanches this week.
On Monday 1/18 two small human triggered wind slabs was reported on lower thousand dollar run, North 3000′. Click here for more info.
On Tuesday 1/19 a small human triggered soft slab was observed on Presidents Ridge, ENE 2800′. Click here for more info.
Signal Word | Size (D scale) | Simple Descriptor |
Small | 1 | Unlikely to bury a person |
Large | 2 | Can bury a person |
Very Large | 3 | Can destroy a house |
Historic | 4 & 5 | Can destroy part or all of a village |
Light winds from the southwest have transported snow and created soft wind slabs 3-4” thick. Expect to find these wind slabs at upper elevations on northeast aspects and near ridge tops. The new snow that fell was very low density and was easily transported by light winds.
Low density snow that fell on 1/19 was transported by light winds, signs of wind transport can be seen throughout the area. We believe that wind slabs have formed in isolated areas and that this avalanche problem will be small in size due to the very low wind speeds. We also believe that if you do trigger one of these avalanches that they will likely run very short distances.
That being said, even a small wind slab can sweep you through rocks or other hazards and cause traumatic injury.
Use hand pits and pole tests to identify soft pillows or drifted snow overlying weaker snow. Shooting cracks will be a red flag for this avalanche problem.
Signal Word | Size (D scale) | Simple Descriptor |
Small | 1 | Unlikely to bury a person |
Large | 2 | Can bury a person |
Very Large | 3 | Can destroy a house |
Historic | 4 & 5 | Can destroy part or all of a village |
Persistent slabs will be unlikely at all elevations and aspects. Small avalanches are unlikely but still possible in very isolated or extreme terrain.
An observation from 1/19 is a good example of the size of persistent slab avalanches you might encounter in Hatcher Pass today.
This week’s new snow was not enough of an additional load to reawaken our persistent slab problems deeper in the snowpack. The snowpack still has poor structure but is gaining strength slowly.
Any avalanche triggered has increased consequences of traumatic injury, due to the high likelihood of being swept through rocks or other obstacles.
We recommend using safe travel techniques anytime you are traveling on or near avalanche terrain. Use adequate spacing when traveling uphill, ride down one at a time, spot your partners, and choose safe zones that are out of harm’s way. Avoid slopes with any terrain trap below.
The 6-8” of low density snow that fell earlier in the week will be capable of producing dry loose avalanches in protected terrain that is 40° degrees or steeper. Human triggered avalanches are possible and will be small in size.
New snow totals 1/17-21
Independence Mine: 6″ of new snow
Good news Hatcher Pass has finally gotten some new snow this week! Overall the weather has been all over the place, but most importantly the pass was spared from rain. On Jan 17th temperatures at Independence Mine started at 33°F but began to decrease into the mid 20s, and a trace amount of new snow fell. As temperatures dropped and snow began to fall, winds from the southeast began to increase and gusts reached 54mphs at Marmot station. These winds did not decrease 17 hours and lasted well into the day on the 18th. On Jan 19th 6-8” of low density snow fell giving Hatcher Pass a much needed refresh. This snow was transported by light winds and has exposed ridgetops once again.
NWS Rec Forecast here.
NWS point forecast here.
State Parks Snow Report and Motorized Access information here.
Marmot 4500′ 1/17-21
|
TEMP
|
RH
|
SPD
|
GUST
|
Dir
|
---|---|---|---|---|---|
Min | 13.8 | 65 | 2 | 4 | ENE |
Max | 27.4 | 100 | 37 | 54 | SSW |
Average | 21.8 | 89.5 | 10.6 | 18.3 | SE |