21 Mar 2021

March 21, 2021

    YESTERDAY:

      08:00 Hrs Saturday am. -5 with a 10-25 KPH ESE wind.

     Above the mid mountain layer.

      The mid mountain layer stuck with us for the day.

      Powder to the People. Fallers Pillow



     A short lived break Saturday am.

      There were some interesting cloud layers in the valley.

      Saturday March 20, 2021. 14:00 Hrs. -4 with a 20-35 KPH SSW wind. +5 in the valley.

      Satellite image from same timeframe as above image.


     15:30 Hours flurries moved through.

      15 minutes later a drying trend with weak ridging.

      18:45 Hrs. -4 with a 10-20 South wind. Sorry for the image quality. Webcam lense scratches.


Weather Observations for March 21, 2021 taken at 06:00 Hours.

2240 meters      -9, Winds were 30-40 KPH SE--Horstman Hut
2180 meters      -8, Winds were 35-50 KPH SE--Whistler Peak
1860 meters      -7, Winds were 15-20 KPH S --Rendezvous 
1835 meters      -7, Winds were  20-40 KPH SE--Round House
1650 meters      -5,  Trace in 12 Hrs, Trace in 24 Hrs, Base 290 cm --Pig Alley
1570 meters      -4,  Trace in 12 Hrs, Trace in 24 Hrs, Base 207 cm--Catskinner
  660 meters     +1, Valley Temp, Max temp Yesterday was +5.6, 0.7 mm of precip yesterday.



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



FORECAST:

A broad upper trough and associated cold front will bring light snow to the area today in a North Westerly/Westerly flow aloft. The FL will likely spike at around 1000 meters dropping back to 700 meters tonight. Moderate winds associated with this front.  Depending on the model we may see snow on Monday or clearing. Going for weak ridging on Monday with unsettled weather Monday morning, with sunny skies by Monday afternoon. More weak ridging for Tuesday with a mix of sun and cloud. A frontal band pushes through by early Wednesday morning with periods of light precip, seasonal temps. Drying trend late Wednesday afternoon with an unsettled weather pattern lasting into the weekend. Guesstimates: 12-18 cm by Monday morning, 0-trace by Tuesday am, 0-trace by Wednesday am, 4-8 cm by Thursday am, 0-trace by Friday am. 


      GOES IR image from this am.


      Broad upper trough with seasonal temps. Snow for today.





      North Westerly flow aloft shifting to Westerly later today.


       Ridge begins to slide into our zone by Monday afternoon.





       Weak ridging for Tuesday with a mix of sun and cloud.



     AVALANCHE ACTIVITY:

      Sz 1 Sa Million Dollar Couloir. MIN report below.                                                   Steven Pic


      Update on the avalanche on Mount Duke. MIN report below.                                    Simon Bold Pic 

      An avalanche has killed a skier at Gudauri Ski Resort. Article below.                                Net Pic

     An avalanche has killed a freerider near Greppon Blanc, Switzerland.                        Net Pic

     Avalanche mitigation on Blackcomb produced some Sz 1 soft slabs Xe. 1-Sz 2 Xe. Cornice Noses.


      Crown Line Sz 2 out of Ladies First, Xe 2-1 Kg shots ignited simultaneously.

      Avalanche mitigation on Whistler produced Sz 1-1.5 Xe Sc soft slabs. Sz 2-2.5 Xc.(cornice drops)


     Sz 1 ski cut (Sc).

     Tree bombs creating pinwheels on the moist surface below treeline.




From Sea to Sky avalanche advisory:

Avalanche Summary

Storm slabs were reactive to human and explosive triggering on Friday, producing numerous size 1-2 avalanches that were 30-60 cm thick. Preliminary reports from Saturday suggest the storm slabs were less reactive, but cornices remained easy to trigger with explosives. Looking forward, fresh storm slab avalanches will be likely later in the day on Sunday.

Prior to the storm, a few isolated large (size 3) avalanches were reported west of Hwy 99, and there is some uncertainty about whether they were just thick wind slabs or whether they also involved older weak layers in the snowpack. These appear to be anomalous events that were perhaps aggravated by warm temperatures last week.

Snowpack Summary

New snow will accumulate throughout the day with 5-10 cm expected around Whistler and 10-20 cm further south and west. This will bring storm totals since Thursday to 40-60 cm, which sits above a melt-freeze crust up to roughly 1600 m and higher on sun-exposed slopes or dry snow on northerly aspects at high elevations.

Around 150 to 300 cm of consolidated snow may overly sugary faceted grains formed earlier this season. These layers are expected to be spotty around the region and we haven't received conclusive evidence of them being the culprit of any recent avalanches. That being said, it is possible they may be associated with a few large avalanches around the Whistler area last week.

Remember that cornices along ridgelines are large at this time of year and always have the possibility of failing naturally or from the weight of a human.



     INFORMATION & OBSERVATIONS:

     Ski Touring Lower Disease Ridge.

     Nice snow on higher North Aspects.

      Wind effect on certain aspects and elevations.

     Convective clouds in the afternoon.

      Snowmobile VS Tree!



FROM SEA TO SKY MIN REPORTS:

Mount Duke Incident: March 18, 2021

Round Mountain: March 20, 2021

Rohr: March 20, 2021

Lower Armchair: March 20, 2021

Million Dollar Couloir: March 20, 2021


VIDEOS:

Speed riding through Avoriaz: Valentin Delluc

Powder Picker March 20, 2021: David Jones


ARTICLES:

An avalanche has killed  freerider near Greppon Blanc: Switzerland

A skier has been killed by an avalanche at Gudauri Ski Resort: Georgia

Avalanche search teams discuss emotional stress, trauma: Colorado

Avalanches on Red Lake Peak: Carson Pass, CA

Avalanche Decision Making-When it's all on: WildSnow


       Submit your best avalanche photo for a pair of Goggles March 1-31, 2021. Sea to Sky Area.

                                                    Thanks to Volkl Canada for sponsoring.

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