17 Apr 2021

April 17, 2021

      YESTERDAY:

     08:00 Hrs. +3 at 660 m. +6 at 1650 m. +7 at 1835 m. +4 at 2180 m.

      A bit more avalanche activity on Mount Currie.

     10:00 Hrs. +13 at 660 m. + 11 at 1650 m. +11 at 1835 m. + 6 at 2180 m.

      Whistler Bowl Friday morning.

     12:00 Hrs. +18 at 660 m. +14 at 1650 m. +11 at 1835 m. +7 at 2180 m.

     14:00 Hrs. +23 Deg C at 660 m. +15 at 1650 m. +13 at 1865 m. +9 at 2180 m.

     16:00 Hrs. +22 Deg C at 660 m. + 15 at 1650 m. + 12 at 1835 m. +11 at 2180 m.

     Satellite image from the same timeframe as above image.

     18:00 Hrs. + 16 Deg C at 660 m. +14 at 1650 m. +12 at 1835 m. + 8 at 2180 m.




Weather Observations for April 17, 2021 taken at 06:00 Hours.

2180 meters     +6, Winds were   0-5 KPH S--Whistler Peak 
1835 meters     +8, Winds were 5-10 KPH ESE--Round House
1650 meters     +6,  0 cm in 12 Hrs, 0 cm in 24 Hrs, Base 260 cm --Pig Alley
  660 meters     +2, Valley Temp, Max temp Yesterday was +24.0, 0.0 mm of precip yesterday.

      As of sunrise, 06:14 Hrs we have clear skies and unlimited visibility.


FORECAST:

A high amplitude ridge will bring sunny skies for today in a North East -Easterly flow aloft. The FL came down to just above surface last night and will rise above 3000+ meters today. May see many temperatures records across the province broken today. Ridging again for Sunday with a bit of cloud in the mix for the morning. Slightly cooler Monday with onshore flow and sunny skies. May see a stratus layer creep into the valleys Monday into Tuesday. Some cloud in the mix for Wednesday but still mostly sunny. May see some moisture from a trough on Thursdasy but no real change until Friday with a weak trough pushing through. Keep enjoying the amazing weather. 


 

      GOES image from this am.


      High is shifting slightly, that is a large low to the North. Going to be a warm day.





      North easterly flow aloft.

        Low giving the high some push back. May see some cloud sneak in Sunday am.





        High still in control. Cooling trend for early next week.

     Yet another dry sunny day Monday.


     AVALANCHE ACTIVITY:

      An avalanche has killed two ski mountaineers on Friuli, Italy. Article below.                        Net Pic

      Wet Loose from the past day.



From Sea to Sky Avalanche Advisory:

Avalanche Summary

There have been several solar triggered wet loose avalanches reported in recent days, up to size 2.5, on solar aspects. There have also been a number of cornice failures reported over the past week.

Looking forward, wet loose avalanches and cornice failures are expected to continue with sun and warm temperatures. The likelihood and potential size of these increases when temperatures do not dip below freezing overnight, and avalanche activity will likely begin earlier in the day with each subsequent warm day.

Wind slabs may still be possible to trigger on high elevation north aspects.

Snowpack Summary

The snow surface may be a crust in some areas, but recent high overnight freezing levels may mean that the snow surface did not freeze in some places. Sunshine and warm temperatures are expected to quickly soften any crusts, resulting in a moist or wet snow surface.

On high elevation north aspects, soft snow or wind slabs may still be found. 

Cornices are large and looming along ridgelines. Their release is unpredictable, requiring a large berth if you're travelling above or below them. Sun and warm temperatures will increase the chances of cornice releases, especially when temperatures remain above zero overnight.



      INFORMATION & OBSERVATIONS:

      Frosty morning on the grass,  -1 early Friday morning. Warming up quickly.

      By 10:00 Hrs it was +13 Deg C in the valley.

      Some new activity evident in the Callaghan Valley.

      Melt freeze cycle may change today!


FROM SEA TO SKY MIN REPORTS:

Callaghan: April 16, 2021

North Summit Strachan: April 16, 2021


VIDEOS:

Large avalanche off Mont Blanc: Thursday

Skier triggered wet loose avalanche: Slow but Powerful


ARTICLES:

Spring weather making mountain snowpack unstable: Avalanche Canada

Communicating Spring Conditions: Powder Canada

An avalanche has killed two ski mountaineers on Friuli: Italy

Unusually deadly avalanche season: Switzerland

Nearly 15 feet of snow greet WSDOT crews digging out: Chinook Pass

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