20 Apr 2021

April 20, 2021

     YESTERDAY:

      08:00 Hrs. +9 at 660 m. +1 at 1650 m. -1 at 1835 m. -3 at 2180 m.

     10:00 Hrs. +12 deg C at 660 m. + 4 at 1650 m. + 2 at 1835 m. +1 at 2180 m.

     12:00 Hrs. + Deg C at 660 m. +8 at 1650 m. +4 at 1835 m. +1 at 2180 m.

     14:00 Hrs. +16 deg C at 660 m. +9 at 1560 m. +6 at 1835 m. + 3 at 2180 m.


      Satellite image from same timeframe as above. Upper shortwave trough slides down the coast.

     Blue Bird all day.



      16:00 Hrs. + 17 Deg C at 660 m. +11 at 1650 m. +9 at 1835 m. + 4 at 2180 m.


      18:00 Hrs. + 17 Deg C at 660 m. +10 at 1650 m. +8 at 1835 m. +5 at 2180 m.

      Lower Disease Ridge before sunset.

      Mount Fee just after sunset.



Weather Observations for April 20, 2021 taken at 06:00 Hours.

2180 meters     +1, Winds were 10-20 KPH NNE--Whistler Peak 
1835 meters     +1, Winds were   5-10 KPH S--Round House
1650 meters     +1,  0 mm in 12 Hrs, 0 mm in 24 Hrs, Base 247 cm --Pig Alley
  660 meters       0, Valley Temp, Max temp Yesterday was +19.9, 0.0 mm of precip yesterday.


      As of 06:08 Hrs, sunrise-we have clear skies and unlimited visibility.


FORECAST:

Upper level ridging will bring sunny skies in a North Easterly flow aloft. The FL will likely spike at around 2500 m with daytime heating, dropping back down to near or just above surface by tonight. A mix of sun and cloud for Wednesday with cooler temps and stronger onshore flow. Ridge gets pinched a bit but still the dominat force in the pattern. Sunny for Thursday as the ridge strengthens one last time before the pattern returns to a cool wet flow bringing seasoanl weather. The forests certainly need a repreive from the record breaking weather pattern over the past 2 weeks. Guesstimates: 0 mm until Friday.


     GOES image from this am.


       Upper level ridge remains the dominant force in the pattern. Sunny skies for today.





      North-North Easterly flow aloft.

.              Easier to see the upper flow in the 500 MB image.


        Unsettled Wednesday with a mix of sun and cloud, lows are pushing back.




     Looking sunny for Thursday, enjoy. Pattern is changing Friday.

      Looking like a nice day on Thursday.


     AVALANCHE ACTIVITY:

      Slab avalanche at Big White Skie resort prompts warning to snowmobilers. Article below.  Net Pic

           Recent activity near Trorey.                                                                            Jeff Slack Image

      Old wet loose in West Bowl.

      Upper Callaghan Valley. MIN report below.                                                      Brandywine Bob Pic

      Taken from South Coast Touring. Large avalanche on Ring Mountain.         Ryan Nadeau Pic


     Large climax slide on Ring Mountain.                                                                     Ryan Nadeau Pic



From Sea to Sky Avalanche Advisory:

Avalanche Summary

Over the weekend, multiple large to very large wet slab avalanches were observed near Whistler, size 2-4. Many of these involved the full depth of the snowpack, running to valley bottom.

 

Solar triggered wet loose avalanches have been reported each day over the past week up to size 2.5. There have also been a number of cornice failures reported over the past week.

Snowpack Summary

A slight dip in overnight freezing levels combined with radiant cooling has formed a melt-freeze crust from 1700-2200 m. Reports indicate that this crust is approximately 15 cm thick but will likely break down quickly with solar radiation and freezing levels through the roof. At lower elevations the snowpack is isothermal. Steep north aspects above 2200 m and higher may still hold dry wintery snow.

Cornices are large and looming along ridgelines. Sun and warm temperatures will increase the chances of cornice failures, especially when temperatures remain above zero overnight.



      INFORMATION & OBSERVATIONS:

      07:00 Hrs in Pemberton, another spectacular day. +4 Deg C. High Sunday was +28.4 Deg C.

      Slide Path 51 above Duffey Lake Road. Gazex bottom of the image.

      Pyroclastic Peak < Click for details.

     Lots of activity in the basin. Solar Oven.

     Whistler T-Bar. Monday evening.


FROM SEA TO SKY MIN REPORTS:

Before Ring Mountain: April 17, 2021


VIDEOS:

Cleaning up after an: Avalanche


ARTICLES:

Snowmobilers warned after avalanche at Big White: InfoNews

DOT continues digging out Hatcher Pass Road over the weekend: Alaska

Earlier snow melt in the Alps means plants loose 'protective coat' exposing them to Frost: WSL

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