23 Nov 2020

November 23, 2020


      Monday November 16, 2020. 12:00 Hrs. -3 with a 10-20 KPH SE wind. +1 in the valley.

      Satellite image from the same timeframe as above.

      Tuesday November 17, 2020. 12:00 Hrs. 0 Deg C with a 30-65 KPH wind. 0 Deg C in the valley.

      Same time frame as above image.

      Wednesday November 18, 2020. 12:00 Hrs. -3 with 0-5 KPH variable breeze. +2 in the valley.

      Satellite image from the same timeframe.

      Thursday November 19, 2020. 13:00 Hrs. -6 with a 15-35 KPH West wind. +2 in the valley.

      Satellite image from the same timeframe.

      Friday November 20, 2020. 14:00 Hrs. -3 with a 20-45 KPH SE wind. +3 in the valley.

     Satellite image from same timeframe.

     Saturday November 21, 2020. 12:00 Hrs. -3 with a 5-10 KPH SE wind. +3 in the valley.

      Satellite image from the same timeframe.

      Sunday November 22, 2020. 13:00 Hrs. -4 with a 20-30 KPH ESE wind. 0 Deg C in the valley.

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Weather Observations for November 23, 2020 taken at 06:00 Hours.

  • 2180 meters      -6,  Winds were 20-25 KPH S--Whistler Peak
  • 1835 meters      -5,  Winds were 10-15 KPH SE--Round House
  • 1650 meters      -5,  2.0 cm in 12 hrs, 4.0 cm in 24 hrs. Base 70 cm--Pig Alley ?
  •   660 meters.      0,  Max temp yesterday was +0.5, 1.6 mm recorded yesterday

     As of 07:00 Hrs this am we have overcast skies with unlimited visibility.

Precipitation recorded at 660 meters (Nesters) in the past week:

Nov 16, 2020        13.8 mm
Nov 17, 2020.       28.7 mm
Nov 18, 2020        10.2 mm
Nov 19, 2020.         6.0 mm
Nov 20, 2020.         5.5 mm
Nov 21, 2020.         0.2 mm
Nov 22, 2020.         1.6 mm


A weak low will bring overcast skies with some very light precipitation this am in a Northwest flow aloft. The FL will hover in the 700-1000 meter range with steadier light precipitation tonight into Tuesday am. A stronger frontal band arrives Tuesday morning with light precipitation increasing to moderate precipitation by the afternoon in a Westerly flow aloft. The FL is expected to rise to 1600 meters as the front pushes through, with a weak upper level trough following on Wednesday bringing unsettled weather and the FL back down to near surface. Will likely get a few sunny breaks Wednesday afternoon with some weak ridging in the mix. Thursday opening day will likely be overcast with the freezing level at surface.  A frontal band may arrive Thursday evening, with some light precip. Friday will see another strengthening frontal band push through with light to moderate precipitation and another spike in the FL. Models are not in agreement this far out, but will start posting more frequently as the mountain opens. Going with more snow in the alpine for Friday. The front pushes through Saturday morning with a weak high developing bringing unsettled weather (mix of sun and cloud) and seasonable temperatures. Unsettled Sunday morning with another weak trough pushing in by the afternoon. Guesstimates: 2-4 cm by Tuesday am, 20-30 cm above 1500 m by Wednesday am, trace-1 cm by Thursday am, 5-10 cm by Friday am, 15-30 cm by Saturday am, 1-4 cm by Sunday am. 

      GOES IR image from this am.

      A weak upper trough for today with another frontal band arriving tonight.

      Fronts along the coast.

       Stronger front for Tuesday with a rise in the FL. 

        Weak upper level trough for Wednesday. 

Another weak frontal band arrives Thursday afternoon with some light precip.

     Thursday at this time is uncertain, may be unsettled but going for cloudy.

         Another frontal band for Friday with a more Southerly influence.  

      May see some weak ridging on Saturday. 

.      Frontal band will likely arrive on Sunday.


      Natural avalanche activity above Horstman Glacier, Image from Sat Nov 21 in the am.

      Duffy Lake Nov 19, 2020. MIN report below.                                                          M Bruhns Pic

      A soldier has been killed in an avalanche in Kashmir. Article below.                        Net File Pic


      Warm front slowly moved in from the South Monday.

      Tuesday sunrise 07:29 Hrs. + 4 Deg C with a 25-70 KPH East wind. 0 Deg C in the valley.

     10 cm of new wet snow in Alpine Meadows Tuesday am.

      Wednesday sunrise 07:31 Hrs. -4 with a 10-30 ESE wind. +1 in the valley.

      Thursday sunrise 07:32 Hrs. -7 with a 20-35 KPH SW Wind. +1 in the valley.

      A brief glimpse at Cowboy Ridge on Thursday around noon.

      Friday sunrise was at 07:34 Hrs. -4 with a 10-30 KPH SE wind.

      Saturday sunrise, 07:35 Hrs. -7 with a 5-15 KPH South wind. -2 in the valley.

      Lookin Good!! Saturday am.

     Sunday sunrise 07:37 Hrs. -2 with a 15-30 KPH ESE wind. -2 in the valley.

     Nesters Weather Plot 650 meters, Sunday morning. 1.6 mm recorded during the day.

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Local Activity:

Duffy Lake: Nov 19, 2020

Green Mtn, Goldbridge: Nov 20, 2020

Central Duffey: Nov 21, 2020

Many reports with snow conditions: Avalanche Canada  


Whistler Weather  Story Nov 23: David Jones


A soldier has been killed, 2 others injured as an avalanche hits army post: Kashmir

Teamwork makes the dream work: Avalanche Canada

Avalanche Canada shares lessons from 2016 Renshaw Tragedy: Andru McCracken

Avalanche Archetypes: Ken Wylie

Wilderness rescuers brace for a busy winter: HighCountryNews 

Unraveling the mysteries of avalanche education: WildSnow

History of Avalanche Forecasting & Mitigation in Utah: Ski Utah

Education & Experience Levels of people involved in avalanches during the 2019-2020 Colorado Avalanche Season: CAIC

The best early season in Years: Cliff Mass

Savoie avalanche forecaster warns of PWL problem in Covid lockdown: France

Techniques for avalanche mitigation: GeoExchange

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