15 Dec 2020

December 15, 2020

     YESTERDAY:

     Sunrise Monday 08:04 Hrs. -5 with a 10-15 KPH SE wind. -1 in the valley.

      Valley cloud layer Monday am.

      Freezing rain in the alpine in the morning.

      There were a few breaks as well.

      Monday Dec 14, 2020. 14:00 Hrs. -4 with a 20-45 KPH ESE wind. +1 in the valley.

      Satellite image from the same timeframe.

      Big picture Monday afternoon. Nice looking low.



Weather Observations for December 15, 2020 taken at 06:00 Hours.

2240 meters      -7, Winds were 85-110 KPH SE--Horstman Hut
2180 meters      -7, Winds were 70-100 KPH S--Whistler Peak
1860 meters      -5, Winds were 30-50 KPH S --Rendezvous 
1835 meters      -5, Winds were 20-45 KPH SE--Round House
1650 meters      -3, 9 cm in 12 Hrs, 9 cm in 24 Hrs, Base 109 cm --Pig Alley
1560 meters      -4, 5 cm in 12 Hrs, 5 cm in 24 Hrs, Base 69 cm--Catskinner
  660 meters       0, Valley Temp, Max temp Yesterday was +2.0 0.5 mm of precip yesterday.


      As of 07:00 Hrs this am we have obscured skies and variable visibility. Snowing.


FORECAST:

A strong front pushes through today with strong winds and light to moderate precipitation in a Southerly flow aloft. The FL should hover in the 800-1100 meter range. Another front arrives Wednesday with a bit more precipitation but similar freezing levels. Dry but cloudy Thursday with another front pushing onshore Thursday night into Friday, with strong winds and moderate to heavy precipitation. Ditto for Saturday. We will see a big improvement by the weekend and likely an active avalanche cycle. Guesstimates: 8-12 cm by Wednesday am, 16-22 cm by Thursday am, 1-3 cm by Friday am, 25-35 cm by Saturday am. 


     GOES IR image from this am.


      Frontal band for today with light precipitation. A bit on the warm side.





      More active front for Wednesday with light to moderate precip, FL still a bit high.





       Drying trend for Thursday, with a weak upper trough. 

Nice low for Friday into Saturday.


     AVALANCHE ACTIVITY:

        No new avalanches observed yesterday, a few sluffs on steep North facing slopes.

From the Sea to Sky Advisory: 

On Sunday, small natural and skier controlled size 1 loose dry and wind slab avalanches were reported running on the crust.

Solar triggered loose snow avalanches size 1-2 were reported on steep solar aspects in the alpine on Saturday. A size 1.5 natural cornice fall was also reported in this MIN from the Garibaldi area.


     INFORMATION & OBSERVATIONS:

      Shovel and probe belong inside your pack. For many reasons!

      Surface hoar still visible but altered after two days with warm air aloft, and buried under new snow.
      

      Still dry snow in the alpine.

      Frost art.

      Coated. Freezing rain again on Monday. 



LOCAL AVALANCHE CANADA MIN REPORTS:

Shovelnose Creek: Dec 13, 2020

Iago: Dec 13, 2020

Nak & Thar: Dec 14, 2020

Sproat Mountain: Dec 14, 2020

Flute-Russet-Fissile area: Dec 14, 2020

Singing Pass Trail from Oboe Creek: Dec 14, 2020 


VIDEOS:

Roof Avalanche: Facebook

Powder Picker Dec 14, 2020: David Jones


ARTICLES:

Pieps DSP--A Beacon of Failure Investigation: Powder Canada

There is a significant risk of avalanches in parts of: Norway

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