11 Apr 2021

Aprl 11, 2021


      08:00 Hrs Saturday, -3 at 660 meters. -11 at 1650 Meters.

      Nice looking morning in the Callaghan Valley. Winter has returned!!

      Mostly cloudy at around 12:00 Hrs. +3 in the valley. -6 at 1650 meters.

     14:00 Hrs Saturday April 10, 2021. +5 Deg C. -4 at 1650 meters.

      Satellite image from the same timeframe as above image.

      Blackcomb Bowl

     18:00 Hrs. +4 Deg C at 660 meters. -5 Deg C at 1650 meters.

      Alpin Glow, new wet loose activity from Saturday pm.

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

2180 meters    -11, Winds were 10-15 KPH SSW--Whistler Peak 
1835 meters     - 9, Winds were   5-10 KPH ESE--Round House
1650 meters    -11,  0 cm in 12 Hrs, 0 cm in 24 Hrs, Base 285 cm --Pig Alley
  660 meters      -6, Valley Temp, Max temp Yesterday was +5.7, 3.3 mm of precip yesterday.

      Sunrise this am was at 06:27 Hrs. Clear skies and unlimited visibility.


Upper level ridging will build and strengthen today in a Northerly flow aloft. Sunny skies will dominate the weather pattern this week as a Rex Block pattern develops over the Pacific Northwest.  The FL will likely rise to 1500+ meters today with daytime heating, dropping below surface again tonight.  Increasing daytime temperatures throughout the week will bring warm spring days into next weekend. No precipitation expected in the near future. Get out the sun screen. 

      GOES image from this am.

       High pressure builds into the Pacific Northwest.

      Northerly flow aloft

      High strengthens, you can see the Rex Block in this image for Monday.

      High dominates the weather pattern over our zone.


      Avalanche activity from yesterday. Not many details. Seems to be a lot of traffic! Renata Lewis Pic

      Different perspective of above avalanche.                                                             Binty Massey Pic

     Extensive avalanche cycle in the Brandywine Area. 1700 M North facing.                Kelven Vale Pic

      Sz 2 Sc in Brandywine area.                                                                                   Kelven Vale Pic

      Sa Sz 2.5 North Side of Brandywine.                                                                        Kelven Vale Pic

      Grizzly Area Sz 1.5 from yesterday.  Looks like a busy place!!                            Binty Massey Pic

     Active avalanche cycle on Saturday.                                                                         Renata Lewis Pic

     Old fracture line from last storm cycle.                                                                   Renata Lewis Pic

       Small slab on convex knob NE Aspect above Hanging Lake.                          Chuck Ratzlaff Pic

      Dry loose activity in the weekend chutes.

From Sea to Sky Avalanche Advisory:

Avalanche Summary

We don't yet have reports showing the results of Friday's storm, but it's likely that surface instabilities were quite active on Saturday, with a mix of wind slab hazards in higher elevation, wind exposed terrain, potentially storm slabs over a slippery crust lower down, and natural loose wet activity on steep slopes where sun exposure destabilized the surface. This mix of hazards was almost certainly more pronounced in the south of the region, which saw up to triple the accumulations of the north.

Looking forward, the new snow is likely to form a reasonable bond with the old surface by Sunday, however recently wind loaded areas and slopes that see solar warming should remain suspect over the near term.

Snowpack Summary

About 10-30 cm of new snow, with a strong southern focus, accumulated through Friday night with strong to extreme south and east winds. Whistler Peak saw gusts of up to 140 km/h. The new snow brings storm totals from this week to about 25-50 cm. Collectively, this recent snow sits on a crust on sun-exposed aspects, and on all aspects below about 1600 m. It likely sits on soft snow or on older wind slabs on north aspects. 

Cornices are large and looming along ridgelines and they formed fragile new growth during the storm. Their release is unpredictable, requiring a large berth if you're travelling above or below them.


      Awesome looking morning in Pemberton. 08:00 Hrs. +1 Deg C.

      Fresh snow in the valley Saturday am.

      Isolated convective flurries later in the am in the alpine.

      Convective flurries in Alpine Meadows around 13:30 Hrs.

      Very unsettled in the early pm.

      15:30 Hrs. 

     High pressure strengthens later in the day. 20:00 Hrs. 


Steep Creek Pow & Crusts: April 10, 2021

Brandywine Backside, Involvement: April 10, 2021

Sproatt Avalanche: April 10, 2021

Cloudburst Avalanche: April 10, 2021

Grizzly Lake Involvement: April 10, 2021



No indication that anyone was swept away in an avalanche on Svalbard: Norway

Whistler linked to largest outbreak of P1 Covid Variant outside Brazil: The Guardian

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