14 Dec 2020

December 14, 2020

     YESTERDAY:

     Sunday sunrise was at 08:03 Hrs. -5 with a 10-20 KPH SE wind. -3 in the valley.

      Warm air aloft Sunday morning, freezing rain for a while in the alpine.

      Trowal pushed through Sunday morning.


     Sunday December 13, 2020. 14:00 Hrs. -4 with a 10-15 KPH SSW wind. -1 in the valley.

      Satellite image from the same timeframe.

     There was still some powder skiing to be had Sunday.

      There were some nice breaks during the day.



Weather Observations for December 14, 2020 taken at 06:00 Hours.

2240 meters      -7, Winds were 25-35 KPH SSW--Horstman Hut
2180 meters      -7, Winds were 20-25 KPH SSW--Whistler Peak
1860 meters      -5, Winds were 10-15 KPH SE --Rendezvous 
1835 meters      -4, Winds were   5-10 KPH S--Round House
1650 meters      -4, 2 cm in 12 Hrs, 3 cm in 24 Hrs, Base 101 cm --Pig Alley
1560 meters      -3, 3 cm in 12 Hrs, 4 cm in 24 Hrs, Base 65 cm--Catskinner
  660 meters      -1, Valley Temp, Max temp Yesterday was -0.3, 1.1 mm of precip yesterday.


      As of 07:00 Hrs this am we have broken cloud and unlimited visibility. 


FORECAST: 

A weak upper trough will bring periods of light precipitation for today in a Westerly flow aloft. The FL could go up to 1000 meters today and hover there for most of the week. Let's hope it gets a bit cooler. Mostly cloudy this am with some flurries, more moisture tonight. The FL will drop back down to surface tonight.  A carousel of fronts move onshore this week with 70-100 cm possible by Sunday above 800 m. Front arrives on Tuesday with steady light precipitation and moderate winds. Wednesday will bring another front, Thursday dries out a bit before some needed West Coast storms arrive Friday and Saturday. Guesstimates: 5-10 cm by Tuesday am, 8-12 cm by Wednesday am, 8-12 cm by Thursday am. 

 

      GOES IR image from this am.


      Weak upper trough for today with periods of light precip. A bit on the warm side at 1500 m.





       Front for Tuesday with steady light precip, similar FL as Monday.





      More of the same for Wednesday.


      AVALANCHE ACTIVITY:

      No new avalanche observations on Blackcomb.

      Still a chance of some Sz 1 wind slabs of 10-40 cm on some steep windloaded aspects.


From Sea to Sky Avalanche Bulletin:

On Sunday, small but stiff skier controlled size 1 wind slabs 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 Garabaldi area.


      INFORMATION & OBSERVATIONS:

      Some breaks Sunday am.

      Warm moist cloud in the alpine.

      Cold faceted snow where the sun doesn't shine.

      Surface Hoar continues to grow.


      Bowling Alley is in great shape.

      Looking better in the afternoon for some more flurries.


LOCAL AVALANCHE CANADA MIN REPORTS:

Hidden Lake: Dec 12, 2020

Armchair Glacier: Dec 12, 2020

Mt Rohr: Dec 13, 2020

Callaghan Crust: Dec 13, 2020

Encore Pit: Dec 13, 2020


VIDEOS:

Skier triggered avalanche Dec 13, 2020: Courchevel, France

Andorra Avalanche: Dec 13, 2020

Powder Picker Sunday Dec 13, 2020: David Jones


ARTICLES:

Ruminations on Rain Crusts: Powder Cloud

Luxury Ski Resorts face a Season Unlike Any Other: Barron's

Calls to Search and Rescue on the rise: Toronto Star



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