11 Mar 2021

March 11, 2021


     Wednesday sunrise was at 06:36 Hours. Cold front had arrived.

      Snowing and blowing at 08:25 Hrs Wednesday am.

      Just after 09:00 Hrs. Snowing with a 25-40 KPH North wind.

      Amazing early bird turns on Hugh's Heaven (Southern Comfort).

      It was snowing 3-4 cm per hour. Once in a lifetime squall!!

      Too Much Fun!!!

      Cold front pushed through by 10:15 hours.

     Horstman Glacier.

      It was a stellar day.

      An awesome afternoon.

     Wednesday March 10, 2021. -5 with a 5-20 KPH North wind. +5 in the valley.

      Satellite image from the same timeframe as above image.

      Whistler Bowl.

      More blue than cloud near the end of the day.

Weather Observations for March 11, 2021 taken at 06:00 Hours.

2240 meters    -11, Winds were 30-35 KPH S--Horstman Hut
2180 meters    -12, Winds were 25-40 KPH SSW--Whistler Peak
1860 meters      -9, Winds were 15-25 KPH ESE --Rendezvous 
1835 meters      -7, Winds were   5-15 KPH S--Round House
1650 meters    -10,  0 cm in 12 Hrs, 1 cm in 24 Hrs, Base 277 cm --Pig Alley
1570 meters    -10,  0 cm in 12 Hrs, 1 cm in 24 Hrs, Base 203 cm--Catskinner
  660 meters      -8, Valley Temp, Max temp Yesterday was +6.5, 0.0 mm of precip yesterday.

      As of 07:00 Hrs this am we have clear skies and unlimited visibility.


An upper level ridge builds for today into Friday in a North Easterly flow aloft. We can expect a mix of sun and cloud for today with the FL spiking at around 1000 meters dropping back to below surface for tonight. Friday will see mostly cloudy skies in the am with a mix of sun and cloud by the afternoon. Similar day on Saturday with the weak ridge shifting East ushering in a frontal band by days end with an increase in cloud cover and some light precip beginning late in the night/early Sunday am. Light to moderate precip for Sunday with seasonal temps. Guesstimates: 0 cm by Friday am, 0 cm by Saturday am, 1-2 cm by Sunday am, 15-25 cm by Monday am.

      GOES IR Image from this am.

       High for today with sunny skies.

      North Easterly flow aloft.

      The low will send some cloud in the mix for Friday. Unsettled!


      Mostly cloudy on Saturday with a few breaks.


      Sa Mt Duke yesterday, MIN report below.                                                          Ben Biswell Image

      Loose dry early Wednesday am.

      Na Sz 1's. Wednesday am. 

      Many dry loose yesterday.

      Sz 1 over traverse.

      Soft slab in Sundays.

     On Blackcomb we saw a dry loose cycle producing up to Sz 1 Na .

      Avalanche mitigation on Whistler yesterday produced some Sz 1 Sc.

      Old wet pinwheeling from Wednesday.

From Sea to Sky avalanche advisory:

Avalanche Summary

There have been reports each day this week of a few natural and/or human-triggered wind slab and dry loose avalanches, ranging between size 1-2, as well as natural size 1 loose wet avalanches on solar aspects at lower elevations.

Explosive control 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. 

Snowpack Summary

50-100 cm of snow from the past weekend has been redistributed by recent winds, forming wind slabs on leeward slopes that remain possible to trigger. Solar aspects likely have a crust on the surface. Massive cornices exist on ridgelines, which can act as triggers on slopes below.

The mid and lower snowpack is well settled and strong in most areas. A weak layer of facets buried in mid-February may still be found but has been gaining strength.


      Always a good idea to pay attention to the signs.

      Cornice debris in Blackcomb Bowl.

     Firm underneath but consistent snow top to bottom on 7Th Heaven Express.

      It was sloughing on steep terrain in the am.

    Dry loose new fresh powder Wednesday am. 

      Fresh tracks all day.


     Anemometer repair at the Horstman weather station.


Cloudburst Northwest Route: Mach 10, 2010

Boomerang: March 10, 2021

Sa Mt Duke: March 10, 2021


The Amazing Ice Volcano: Kazakhstan

Gopro/Airbag courage: Colorado

Powder Picker March 10, 2021: David Jones


This very,very deadly avalanche season ain't over yet: Forbes

The ten worst avalanches in Colorado history: Real History

Big St. Joe avalanche case study: Montana

Couple gets stranded after following GPS on snow covered roads: Idaho

Vail Resorts gives bonuses to Employees except for unionized Ski Patrollers: Really??!!

       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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