No recent activity
More snow started falling from 11am on Friday the 07/08/2020 and should continue until Monday the 10/08/2020.
Very low visibility was seen today while out doing observations. Sky cover was 8/8.
Temperatures were cold with ambient sitting at -3 degC @ 1900m.
Pit results showed a HS of 215 cm.
Our Primary concern is a deep layer of persistent melt freeze at 120cm. This layer was tested with a deep tap test and got hard planar results on the 22nd tap.
Our secondary concern is the recent 40cm of lee to the North West Wind Slab was sitting on the melt freeze crust from the warmer temperatures from earlier in the week.
A layer of Graupel exists within the Wind Slab at 25cm and we had moderate Sudden planer results on this layer.
We also had Moderate Sudden collapse results at 15cm on buried surface hoar also within the recent Wind Slab.
We had no signs of propagation on the extended column tests.
Moderate shove shear results on the graupel layer at 25cm.
Stay clear of Lee to the North West aspect that are steep and stay safe while the visibility is poor in low altitude tree runs in the backcountry until these concerns are no longer apparent.
Size 1 wet slab release to ground at Mt Clark. Natural Avalanche, no skier involvement.
There is a 10cm rain / sun crust on the surface thats only softening for a few hours around midday.
Cold overnight temps are preserving this crust and making the backcountry very firm to ski on early in the day and in the late afternoons.
Testing of the snow pack shows a total snow depth of 51cm.
We had moderate compression test results with sudden collapsing at 35cm on the 1 finger layer of snow above the ice layer at 37cm.
There is a 8cm layer of very low density snow on the ground which is fist resistance.
This layer has been observered to have failed at Mt Clark during the week with a size one wet slab releasing.
With rain starting on Sunday and continuing until Wednesday, the whole snowpack is now isotermal.
The hard temperature gradient from last week has now gone weak and the snowpack is now cluster melt forms.
We got moderated results on a rounding wet layer of buried surface hoar @8cm
This layer was collapsing and sticking when tested and showed no signs any planar results
The rain has fully saturated the low density layers that were persisting below 25cm in the snowpack.
We will continue to check the stability of the snowpack throughout the week and report back with any changes.
We will pray for some colder temps to "Firm " up the snowpack.
Stay away from steep, thicker lee slopes as the risk of avalanche in these areas will have a greater consequence is it was to slide.
7cm of wind blown snow on lee to the NW was observed today. .
This sits on one of many sun crusts buried in the snowpack currently.
The snow event from the 13th of July is also very evident with 4 finger resistant snow from 18-51cm.
Buried in this layer is a 1cm layer of graupel that we got sudden collapse results on CT test in the moderate range.
the layer of concern for the snowpack is the low density snow from the 13th of july storm that is sitting on a sun crust.
If this layers bond was to fail there would be a large 50cm slab.
Stay clear of steep lee to the SW slopes until the the snow pack becomes more consolidated
5cm of new snow on Sunday night has been loaded on slopes lee to the SW.
The result is a 10cm sun crust in all ares that have not received this wind loaded snow.
Our primary concern now is wind slab on these lee slopes
No reported instabilities at this stage but we will continue to monitor the situation.
60cm snowpack height.
Snow reported down to 1000m in the NSW Main range. Caution on the roads today. With 25cm of new snow in the Alpine as of the 12.7.20 and the continued snowfall overnight we will need to keep the advisory at Moderate. Wind slab was forming on the 12 of July and will be increasing in size.
All testing of the snowpack was showing that the new snow was bonding well to the melt freeze crust from last weeks stable warm condition.
Moderate Shovel shear results @33cm
Moderate Compression test with breaks @ 33cm
No signs of instability were reported on the 12.07.20
Stay tuned for more info.
86 cm Snow height
The snow has passed and looks to be returning on Friday the 10th of July.
The storm cycle from the weekend has deposited 25cm of snow. This 25cm of new snow has a buried layer of Surface hoar @ 8cm from the surface. The new snow below the buried surface hoar has fallen on wet layer of melt-freeze and has bonded well after testing this interface.
The top layer (25cm) of the snowpack is low density snow consisting of fist and 4 finger resistance layers.
The layer of concern is Facets down at 28-46 cm as these are low density grains and have fist resistance.
Easy Shovel Shear Results @ 28cm
Compression Test result was Moderate (13) and was planar shear quality.
90 cm Snow height
Blizzard conditions yesterday while out in the field
Rain falling below 1500m turning to snow in the Alpine
The rain has consolidated the low-density snow that was evident in the top 25cm of the snowpack before this this storm event. The new snow has fallen on wet layer of melt-freeze and has resistive bonding when testing this interface.
The top layer of the snowpack is wind slab and we will continue to see grow over the day as this storm cycle continues.
Easy Shovel Shear Results
Compression Test result was easy (6) and there was a resistive planar result on the melt-freeze layer.
No result from the Extended Column Test.
70 cm Snow height
The snow pack was covered with surface hoar from 1680 to 1880m
Below the hoar is a sun crust with 6cm of melt forms at Pen resistance.
There are 2 layers of faceted snow between sun crusts from 8-24cm with 4 finger resistance.
We got CTV results while back cutting the column and easy shovel shear results on the facet layers
Rain starting on the 1st of july turning to snow on the 3rd and continuing to the 5th.
We will publish more observations on the 1st of July.
Hopefully the rain saturates the faceted layers and makes the top section of the snowpack more stable before the new snow arrives on the 3rd of July
265 cm Snow height
The snow pack has a sun crust on the surface, below this crust there is 1F resistance rounds to the depth of 28cm
We got hard shovel shear results at 28cm and 72cm but no results from our compression test.
There was S1 precip during the day and this storm front will continue over the the next few days.
40 cm Snow height, There is a density change in the snowpack at 15cm. 0-15cm is 1F hardness, below 15cm is F hardness.
There is a reactive layer here, easy hand shear results, no CT results.
This storm cycle will continue over the weekend. More snow predicted till Monday the 4th of May.