8 Mar 2021

March 8, 2021


     Sunday sunrise, 06:42 Hrs.  -6 with a 15-30 KPH East wind.

      Snowing in the valley early Sunday am.

      There were a few breaks in the precip Sunday am.

     Patches of blue around 10:15 Hrs.

      Serious power flurries.

     Unsettled with breaks and periods of snow.

      Power flurries just after 12:00 Hrs Sunday.

      Sunday March 7, 2021. 14:00 Hrs. -7 with a 10-25 KPH ESE wind. +2 in the valley.

             Goes image from same timeline as above.

     Nice snow in Feather Trees.

     Dried out later in the afternoon.

Weather Observations for March 8, 2021 taken at 06:00 Hours.

2240 meters    -11, Winds were 10-20 KPH S--Horstman Hut
2180 meters      -8, Winds were 15-25 KPH ESE--Whistler Peak
1860 meters      -9, Winds were   5-10 KPH SE --Rendezvous 
1835 meters      -9, Winds were   5-15 KPH ENE--Round House
1650 meters      -8,  3 cm in 12 Hrs, 15 cm in 24 Hrs, Base 294 cm --Pig Alley
1570 meters      -8,  3 cm in 12 Hrs, 16 cm in 24 Hrs, Base 220 cm--Catskinner
  660 meters      -3, Valley Temp, Max temp Yesterday was +3.2, 5.8 mm of precip yesterday.

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


A low off the coast and weak ridging inland will give a mostly cloudy day with some sun shine this afternoon. Sun should be most prominent between 14:00-18:00 Hrs in a Southerly flow aloft. Cloudy tonight with the FL rising to as high as 1200 m dropping back down below surface over tonight. The low slides down the Coast Tuesday with mostly cloudy skies, unsettled for a while in the afternoon, with the chance of some isolated flurries in the am. Weak ridging for Wednesday with unsettled dry weather, brief sunny period later in the afternoon. A mix of sun and cloud for Thursday.  Next front should arrive Saturday. Guesstimates: 0 cm by Tuesday am, 0-trace cm by Wednesday am, 0 cm by Thursday am. 

      GOES IR image from this am.

      Low off the coast and inland high will bring mostly cloudy skies for today with some breaks.

      Southerly flow aloft.

      Low slides South but will continue to send cloud our way on with unsettled weather for Tuesday.

        Inland high strengthens a bit on Wednesday with some sunshine later in the day.


             Sz 1 on steep terrain above skin track. 1200 m North aspect. 60 cm crown. Rain crust.

     Sa Sz 0.5 on the Duffey, MIN report below.                                                              Cadrever Pic

     AC on Whistler yesterday produced some Sz 1-1.5 Xe Sc. 

     AC on Blackcomb produced some Sz 1 Sc small pockets of wind slab.

From Sea to Sky avalanche advisory:

Avalanche Summary

Explosive mitigation on Saturday produced numerous large cornice and storm slab avalanches, with 50-100 cm crown depths. Explosives also released a very large (size 3) wind slab avalanche on a northeast aspect above 2000 m. 

Reports indicate that a natural avalanche cycle occurred during the storm on Friday, with small to large (size 1-2.5) avalanches releasing in the storm snow across aspects and elevations. See this MIN report for an example from Hanging Lake.

Snowpack Summary

50-100 cm of snow accumulated over the weekend, and it is settling rapidly. The recent snowfall was accompanied by strong south winds, forming wind slabs on leeward slopes that may be likely to trigger. Massive cornices exist on ridgelines, which can act as triggers on slopes below. Rising temperatures and strong sun on Monday is expected to destabilize cornices and recent snow. Watch for signs that the snow is rapidly warming, such as pinwheels, rollerballs, and point releases.

In isolated areas with a shallower snowpack in the region, a layer of facets, spotty surface hoar, and/or crusts buried in mid-February may still be preserved. There have been no avalanches reported on this layer; however, large triggers, such as an avalanche in motion, cornice fall have the potential to trigger this deeper layer in areas where it may still exist.

The mid and lower snowpack is well settled and strong in most areas.


      Adventure Smart was set up over the weekend at the base of the Blackcomb Gondola.

.      Spin drift Sunday am. 40-60 KPH winds.

      Layers are getting thicker.

     Snowing 2 cm per hour just after 14:00 Hrs. 13 cm of new. Base at 1570 meters was 224 cm.

      Powder and Sun

      Last ride up GE, Sunday afternoon. Where did everyone go??                                      MC Image

                  Recent snow profile.


Rainbow: March 6, 2021

Joffre Shoulder: March 7, 2021

Rohr Ridge: March 7, 2021

0.5 point release: March 7, 2021


Wet Avalanche Problems: CBAC

Powder Picker March 7, 2021: David Jones


More details emerge after deadly North Idaho Avalanche: Tiger Peak

Chair Peak avalanche, March 1, 2021: Brief Historical Review

Company issues recall of avalanche beacons: Pieps

Can you learn avalanche safety online: Outside

WANTED any transceiver either working or not

$150 reward for trading in on a new Arva Neo Pro at $499 
$100 reward for trading in any transceiver in on an Evo 4 at $329 or Evo 5 at $385

Mike Dempsey
Your representative in Canada and the United States for ATMRECYCYCLINGSYSTEMS.COM and VORTEXDEPOLLUTION.COM in Canada

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