15 Apr 2021

April 15, 2021

     YESTERDAY:

      08:00 Hrs Wednesday. 0 Deg C at 660 m. +1 at 1650 m. 0 Deg C at 1835 m. 0 Deg C at 2180 m.

     10:00 Hrs. + 9 Deg C at 660 m. + 4 at 1650 m. + 2 at 1835 m. -2 at 2180 m.

      Melt Freeze Cycle



     12:00 Hrs. +12 deg C at 660 m.

     14:00 Hrs. +14 Deg C at 660 m. +10 at 1650 m. + 6 at 1835 m. +1 at 2180 m.

      Satellite image from the same timeframe as above image.

     16:00 Hrs.  + 20 Deg C at 660 m.  +11 at 1650 m. +9 at 1835 m. +3 at 2180 m.

     18:00 Hrs. + 19 Deg C at 660 m. +9 at 1650 m. +9 at 1835 m. +4 at 2180 m.

     Just before sunset, which was at 20:04 Hrs.



Weather Observations for April 15, 2021 taken at 06:00 Hours.

2180 meters     +1, Winds were 5-10 KPH NNE--Whistler Peak 
1835 meters     +3, Winds were   0-5 KPH SSW--Round House
1650 meters     +1,  0 cm in 12 Hrs, 0 cm in 24 Hrs, Base 272 cm --Pig Alley
  660 meters      -2, Valley Temp, Max temp Yesterday was +20.3, 0.0 mm of precip yesterday.


      Sunrise 06:18 Hrs, we have clear skies and unlimited visibility.


FORECAST:

A strong high pressure will bring sunny skies and warm temperatures in an Easterly flow aloft. The FL will spike at 3000+ meters today, may drop down to surface tonight but unlikely looking at the 850 mb temperatures. Looking mostly sunny with some cloud pushing in on Sunday? No real change until next Thursday when a front will bring precip into Friday. More on that as we get closer. Enjoy the summer weather.


      Satellite image from this am.


            Persistent Omega Block for today into Thursday.


      Strong high with warm temps for today.





      Easterly flow aloft.

       500 MB image from this am.



      Strong high with warm temperatures for Friday.





       Strong high with warm temperatures for Saturday.

      Massive high along the Coast.


        AVALANCHE ACTIVITY:

        Recent slab avalanche in the Rutherford Area. MIN report below.                   GHelgeson Image

      New wet loose on Armchair.

      Some new activity in West Bowl.

      Lower Disease Ridge.


From Sea to Sky Avalanche Advisory:

Avalanche Summary

There have been several size 1-2 natural and human triggered storm and wind slab avalanches reported over the past week. These were mainly on northerly aspects in the alpine and at treeline. 

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

Looking forward, wet loose avalanches are expected to continue with sun and warm temperatures. The likelihood of cornice failure also increases with warming. Wind slabs may still be possible to trigger at upper elevations. 

Snowpack Summary

The snow surface is a crust in most areas, except on north aspects above about 1500 m, where both soft snow and wind slabs may exist. In areas where the surface is a crust, sunshine and rising freezing levels are expected to soften the crust during the day.

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.



      INFORMATION & OBSERVATIONS:

      Fine looking day, high scattered cloud started disipating.

      Looks great to the SW as well.

      So smooth!!

     A few tracks coming in from the backcountry.

      Not much in the way of clouds in the afternoon.

     Alpin glow on Road Runner Traverse.



FROM SEA TO SKY MIN REPORTS:

Pelion Ski Tour: April 13, 2021

Rutherford Far & Wide: April 14, 2021


VIDEOS:

The Science behind one of the deadliest avalanche seasons ever: USA

Wet Snow Avalanche 2014: Switzerland


ARTICLES:

Hundreds stranded as another avalanche hits Baralacha La Pass: Northern India

As the Tulips rise: Avalanche Canada

Back Country avalanche warning in effect for Western Chugach, Kenai Mountains: Alaska

2020 season busiest ever for BC SAR Groups: 25 % Increase

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