6 Apr 2021

April 6, 2021

     YESTERDAY:

.      07:00 Hrs Monday, -5 Deg C in the valley. -7 at 1650 meters.

     Horstman Glacier in the early am.

      Gondola cabins have been put to bed.

     14:00 Hrs. + 9 Deg C. + 4 Deg C at Pig Alley 1650 meters. High in the valley yesterday was + 11.5.

      Satellite image from the same timeframe as above image.

      Lower Disease Ridge and Decker Cornice Lines.

      Blue Bird at 18:30 Hrs.


      Alpin glow Monday evening.


Weather Observations for April 6, 2021 taken at 06:00 Hours.

2180 meters      -7, Winds were 15-20 KPH SSW--Whistler Peak 
1835 meters      -5, Winds were 10-15 KPH SE--Round House
1650 meters      -8,  0 cm in 12 Hrs, 0 cm in 24 Hrs, Base 283 cm --Pig Alley
  660 meters      -3, Valley Temp, Max temp Yesterday was +11.5, 0.0 mm of precip yesterday.

The FL rose to 1900 meters yesterday.


      As of sunrise at 06:37 this am we have broken cloud and unlimited visibility.


FORECAST:

Weak upper level ridging will bring unsettled weather this am in a Westerly flow aloft. The FL will rise to around 1400+ meters dropping back down to 1000 meters tonight. We will see an increase in cloud cover this pm as the next front approaches the area with light precip starting before midnight. Upper level trough and associated cold front pushes through Wednesday with light precip and cooler temps. Weak ridging on Thursday will bring unsettled weather with a mix of sun, cloud, and some flurries at the end of the day. Friday another upper level trough will bring light precip with strong winds through the day. Unsettled weather for Saturday with weak ridging in a Northerly flow aloft accompanied by cool temps. Ridge strengthens for Sunday with sunny weather. Guesstimates: 3-8 cm by Wednesday am, 20-25 cm by Thursday am, trace-2 cm by Friday am, 12-18 cm by Saturday am, trace-1 cm by Sunday am. 


      GOES IR image from this am.


         Low to the North will slowly send more cloud our way as the ridge flattens.






     Westerly flow aloft.


        Upper level trough for Wednesday with seasonal temps and light precip.






       Weak ridging for Thursday with the low to the North sending another trough for Friday.

      Unsettled weather for Thursday.


      AVALANCHE ACTIVITY:

      An avalanche has killed a ski tourer near Lake Louise, Haddo Peak. Article below. AC Image

     Recent, likely Sunday slab avalanche, West Facing above Grizzly Lake Sr?           Kelven Vail Pic


      Recent wet loose on Parkhurst Ridge.

      Recent wet loose in West Bowl.

      New wet loose on Monday.

      Wet loose above the Poop Chutes on Monday.

      Numerous wet loose activity on Monday in the local area. 



From Sea to Sky Avalanche Advisory:

Avalanche Summary

A natural avalanche cycle was observed in the region on Saturday during the storm. On Sunday, there were a few size 1-1.5 human triggered wind slab avalanches reported. This MIN describes triggering a small wind slab in large terrain. Looking forward, wind slabs could still be triggered by riders at high elevations.

Snowpack Summary

The region got about 20 cm of snow above 1600 m over the weekend. The snow was accompanied by strong southeast wind, so wind slabs may linger at high elevations on lee terrain features. The new snow sits on a hard melt-freeze crust everywhere except for north aspects above 1600 m, where it sits on previously dry snow. The snow surface has likely melted and frozen into a crust on sun-exposed aspects. 

Cornices are large and looming along ridgelines. Their release is unpredictable, requiring a large berth if you're travelling above or below them.



      INFORMATION & OBSERVATIONS:

      Chilly morning in the valley, as of 08:00 Hrs -3 Deg C. Warming up!!

     Some high cloud to the NE in the am.

      Pristine Whistler Bowl.

     Some tracks on lower Fissile shoulder.


      Cornices are large, avoidance is a good idea. Image from above Overlord Glacier.



      Snow stake at 660 meters is bare. High of + 11.5 Deg C  on Monday.

     Rumors of 40 % positive testing for covid cases in Whistler. Brazilian variant is here.

      Reflection in Green Lake Monday before sunset.



FROM SEA TO SKY MIN REPORTS:

Yo Yo Skiing Paul Ridge: April 5, 2021


VIDEOS:

Wet Loose vs Wet Slabs: Montana


ARTICLES:

One person dead after avalanche at Lake Louise: Global News

Fatal avalanche incident at Haddo Peak-2021-04-05: MIN Report

Boy goes missing after avalanche descends in Alai District: Kyrgyzstan

CAIC says avalanche danger has increased this week: Colorado

How to safely introduce your teens to Backcountry Skiing: SkiMag

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