31 Mar 2021

March 31, 2021

      YESTERDAY:

      Sunrise Tuesday was at 06:52 Hrs. -9 no wind, dead calm.

      09:00 Hrs. -7 with a 0-5 KPH East breeze.

     12:00 Hrs. -5 with a 15-25 KPH West wind. 


      Tuesday March 30, 2021. 14:00 Hrs. -4 with a 5-10 KPH West wind. +8 in the valley.


      Satellite image from the same timeframe as above image.

     18:30 Hrs.


Weather Observations for March 31, 2021 taken at 06:00 Hours.

2240 meters      -6, Winds were 10-20 KPH SW--Horstman Hut
2180 meters      -6, Winds were 10-20 KPH W--Whistler Peak
1860 meters      -3, Winds were   5-15 KPH ESE --Rendezvous 
1835 meters      -3, Winds were   5-10 KPH SE--Round House
1650 meters      -7,  0 cm in 12 Hrs, 0 cm in 24 Hrs, Base 287 cm --Pig Alley
1570 meters      -6,  0 cm in 12 Hrs, 0 cm in 24 Hrs, Base 200 cm--Catskinner
  660 meters      -1, Valley Temp, Max temp Yesterday was +8.2, 0.0 mm of precip yesterday.


      As of 07:00 Hrs this am we have broken cloud and unlimited visibility above 1500 meters.

      Significant stratus layer mid mountain Wednesday am.


FORECAST:

The ridge of high pressure will slowly slide East today in a North-North Westerly flow aloft bringing warm temps to the area. The FL will rise to 1600 meters, possibly higher with increasing cloudy conditions as the day progresses. A series of short wave troughs will bring periods of light precip and unsettled weather into the weekend. For today we will see a mix of sun and cloud with a weak trough arriving early Thursday am with periods of light precip. Should see some breaks by Thursday afternoon with a mix of sun, cloud, and convective flurries. A very weak trough arrives early Friday morning with some flurries and unsettled weather into Saturday am. A more vigorous trough pushes through on Saturday with steady light precip and seasonal temps. By Sunday am the trough pushes through with more unsettled weather in its wake. Monday is looking dry with unsettled weather. Guesstimates: trace-1 cm by Thursday am, 1-3 cm by Friday am, 0-trace cm by Saturday am, 12-18 cm by Sunday am, 1-3 cm by Monday am.


      GOES IR image from this am.


        Weakening ridge with some cloud spilling in from the North. Unsettled for today. Warm!





      Northerly Flow aloft.

       Weak trough for Thursday with cold front pushing through cooler temps.



      Weak upper trough with dry unsettled weather for Friday. Cooler temps.

      Weak upper through on Friday.


     AVALANCHE ACTIVITY:

      An avalanche has claimed the life of a snowmobiler East of Williams Lake. Article below. Net Pic


     Sa Sz 2 in the Duffey. MIN report below.                                                                           Lee Lau Pic


     Recent Na on the Tantalus Range.                                                                                   Ross Berg Pic

      Skier remote from Monday.                                                                                          Ross Berg Pic

     Slab release in the Tantalus range from Monday.                                                           Ross Berg Pic

     Wet loose from Monday with Sz 1's Sr.                                                                      Ross Berg Pic
     

.       No new avalanches observed on Blackcomb.

.      Wet loose point releases observed on Whistler. Cornice tabs have been dropping.



From Sea to Sky Avalanche Advisory:

Avalanche Summary

By midday on Tuesday reports indicated that small loose wet avalanches occurred from steep rocky terrain. Cornices also became weak and failed with daytime warming. No slabs were reported from the slopes below. 


On Sunday, natural storm slab avalanches up to size 2 were reported and numerous size 1.5 slabs were easily triggered by skiers and riders from steep slopes where the new snow sits above a crust. 


The likelihood of triggering avalanches will decrease somewhat in the wake of Sunday's storm, however, human triggering remains likely, especially in wind loaded areas at upper elevations. With so much new snow, even short periods of direct sun can trigger natural avalanches. Cornices are large and should be given a wide berth, especially when the sun comes out.


Snowpack Summary

Up to 40 cm of snow fell throughout the region since the weekend. This was accompanied by strong southwest winds that switched to the northwest. Reactive wind slabs could be lingering on a variety of aspects at upper elevation, especially where they sit above a crust. 


The recent snow sits above a widespread melt-freeze crust, with the exception of high north-facing terrain. It may also be sitting on small surface hoar crystals reported on north and east aspects in the alpine. This recent precipitation likely fell as rain in many areas below treeline. A melt-freeze crust exists below treeline.


Cornices along ridgelines are large, and the likelihood of them failing will increase when the sun comes out.



      INFORMATION & OBSERVATIONS:

      Sunny skies at 10:30 Hrs. -4 with a 5-10 KPH South breeze.

     Clouds developed in the afternoon.


      Armchair Glacier, not much activity. Looks like some old sloughing.

      Green Lake Breakup.


       From winter mode to summer mode in one day!

      Saw a few people skiing down to the base??!! Now officially closed until May 21, 2021.



FROM SEA TO SKY MIN REPORTS:

Husume High Traverse: March 29, 2021

Howe Sound Crest Trail: March 29, 2021

Cayoosh Lazy Boy Area: March 29, 2021

Central Duffey Avalanche Sa Sz 2? : March 30, 2021

Chief Pascal: March 30, 2021

Mountain Conditions Report-Sea to Sky: March 30, 2021


VIDEOS:

Skier flanked by 2 avalanches: Mickael Bimbos

Powder Picker March 30, 2021: David Jones


ARTICLES:

An avalanche East of Williams Lake has killed a snowmobiler: Eureka Peak

MIN report from the Eureka Peak avalanche fatality: March 29, 2021

Cy Whitling raises avalanche awareness through Art: Teton Gravity Research

Switzerland records 215 avalanches this year: March 31, 2021

Whistler Blackcomb will remain closed until May 21, 2021: CBC News



      Submit your best avalanche photo for a pair of Goggles March 1-31, 2021. Sea to Sky Area.

                                                    Thanks to Volkl Canada for sponsoring.

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