25 Dec 2020

December 25, 2020

      YESTERDAY:                      

      Sunrise Thursday was at 08:10 hrs. 

 
.       WB weather machine producing snow in the valley.

      Marine Stratus Layer moving in from the North.

      Some nice light in the am.

      Looking South West!


     Clouds moved in quickly.

      Thursday Dec 24, 2020. 15:00 Hrs. -2 with a 20-35 KPH SE wind. -5 in the valley.


      Satellite image from the same timeframe.

      Winter conditions in the valley.


      Merry Christmas


Weather Observations for December 25, 2020 taken at 06:00 Hours.

2240 meters      -5, Winds were 80-105 KPH SE--Horstman Hut
2180 meters      -4, Winds were 50-80 KPH N--Whistler Peak
1860 meters      -2, Winds were 30-60 KPH S --Rendezvous 
1835 meters      -1, Winds were 15-30 KPH E--Round House
1650 meters       0, 0 cm in 12 Hrs, 0 cm in 24 Hrs, Base 143 cm --Pig Alley
1560 meters       0, 0 cm in 12 Hrs, 0 cm in 24 Hrs,   Base 85 cm--Catskinner
  660 meters      -6, Valley Temp, Max temp Yesterday was -3.6, 0.0 mm of precip yesterday.

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


FORECAST: 

A slow moving front will bring periods of light precipitation today in a South West flow aloft. The FL will hover in the 1500 meter range and drop back down to surface tonight. An upper level trough will push through on Saturday with periods of light precip, easing by Sunday.  Sunday is looking to be mostly cloudy with some flurries in the mix. Weak ridge begins to build for Monday with sunny weather by the afternoon. Guesstimates: 5-10 cm by Saturday am, 5-10 cm by Sunday am, trace-1cm by Monday am.


      GOES IR image from this am.


       Cold front pushes through today with periods of light precip.





       Upper level trough for Saturday with periods of light precip.





        Unsettled Sunday, mostly cloudy with some snow flurries.


      AVALANCHE ACTIVITY:

      Old fracture line on Pyroclastic.

      Slabby snow.

      Old fracture line on Black Tusk.

      No new avalanche activity on Whistler

      No new avalanches observed on Blackcomb. Wind transport on Thursday!!!

From the Sea to Sky Advisory:

Numerous wind slab avalanches were reported Tuesday, triggered naturally and by riders at treeline and alpine elevations. Most occurred on wind loaded southerly aspects due to recent northerly wind. Check out these MINs for a few examples: herehere, and here.

A few large avalanches have been observed on the weak layers described in the snowpack summary within the past week and they were triggered triggered by riders, explosives, and naturally. They occurred on northerly aspects between 1900 and 2100 m and were generally 30 to 50 cm deep.



     INFORMATION & OBSERVATIONS:

     Close up of fracture line on Pyroclastic Peak

     Sastrugi < click for explanation.

      Awesome light in the morning.


      Lenticular clouds to the North in the am.

      Lots of tracks!!


    Nice soft light.


LOCAL AVALANCHE CANADA MIN REPORTS:

Cloudburst NE Route: Dec 24, 2020

Gin Peak Boulder Field: Dec 24, 2020

Rainbow Mtn. recent avalanche: Dec 24, 2020

Needles Tree: Dec 24, 2020


VIDEOS:

Crews conduct avalanche control near Revelstoke: Rogers Pass

Powder Picker Dec 24, 2020: David Jones

Avalanche problems: CAIC


ARTICLES:

Looming danger in the Swiss Alps: Avalanches

CAIC releases final, detailed reports on Two Deadly avalanches from last week: Colorado

A holiday safety message: Powder Cloud

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