30 Mar 2021

March 30, 2021

     YESTERDAY:

     Sunrise Monday am was at 06:55 hrs. -11 with a 10-20 KPH West wind.


     Moon Set Monday am.

     Another awesome day, strange how it can become the last day of the winter season so easily.

     More good turns to be had.

     Amazing conditions Monday am.

     Spectacular snow conditions.

       Harmony line up at around noon on Monday.                                                     Greg Dixon Pic


      Monday March 29, 2021. 14:00 Hrs. -11 with a 10-20 WNW wind. +4 in the valley.

     Satellite image from same timeframe as above.



     Many folks enjoying the last day of the winter season. Hopefully it reopens April 19, 2021.

      Convective clouds in the afternoon, even some convective flurries at 2240 meters around 16:00 Hrs.


Weather Observations for March 30, 2021 taken at 06:00 Hours.

2240 meters      -9, Winds were 10-15 KPH NW--Horstman Hut
2180 meters      -9, Winds were 10-15 KPH WNW--Whistler Peak
1860 meters      -9, Winds were    0-5 KPH ENE --Rendezvous 
1835 meters      -9, Winds were    0-5 KPH W--Round House
1650 meters    -10,  0 cm in 12 Hrs, 0 cm in 24 Hrs, Base 291 cm --Pig Alley
1570 meters      -8,  0 cm in 12 Hrs, 0 cm in 24 Hrs, Base 203 cm--Catskinner
  660 meters      -6, Valley Temp, Max temp Yesterday was +5.7, 0.0 mm of precip yesterday.



      As of 07:00 Hrs this am we have a few scattered clouds and unlimited visibility.



 FORECAST:

The ridge of high pressure will continue to dominate the weather pattern in a Northerly flow aloft. The FL will likely spike at around 1200 meters today dropping below surface tonight. Should see some clouds push in this afternoon. The flow will likely shift to North Westerly sometime this afternoon. Unsettled Wednesday with a mix of sun and cloud in a South Westerly flow aloft with increasing cloud cover in the pm. A weak cold front arrives Thursday morning with periods of light precip and seasonal temps. Several small fronts will affect the area into Sunday. Guesstimates: 0 cm by Wednesday am, 0-trace by Thursday am, 1-4 cm by Friday am, 1-4 cm by Saturday am.



      GOES IR image from this am.


      High pressure for today with mostly sunny skies.







      Northerly flow aloft.


         Low to the North will send some cloud our way on Wednesday.






      Upper level troughing will send a weak cold front our way on Thursday.


.      Weak trough moves down the coast Thursday.

      AVALANCHE ACTIVITY:

      Russet natural Avalanche. MIN report below.                                                      Plabrosse 1486 Pic

      Recent avalanche activity in the Rutherford. North aspect. During the storm.      Kelvin Vail Photo

      Sa Sz 1.5 Backside of Spearhead Peak. Image taken on March 29, 2021.                Kevin Brott Pic

      Different perspective from image above. Taken from SCT.                                         Eric JG Photo



      Avalanche mitigation on Blackcomb yesterday am, produced  some Sz 1 Xh Xe, 1-Sz 1.5 Xh.

     Dry loose in Emerald Bowl.                                                                                      Greg Dixon Pic



      Minor wet snow releases in the pm Monday. Lakeside Center.

.       Sz 1 out of the Lady

     Sz 1.5 out of Holly Cow.

      Sz 1 Xe out of Schrund Alley.


      Sz 1's in the Stupids Monday am.


      Avalanche mitigation on Whistler yesterday produced Sz 1-1.5 storm slabs Xe, Sz 1-2.5 Xc Xe.



From Sea to Sky Avalanche Advisory:

Avalanche Summary

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

20-40 cm of new snow fell throughout the region since Saturday night. This 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. The snow surface has likely frozen into a crust at lower elevations.

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



      INFORMATION & OBSERVATIONS:

     Tricouni in the early am.

      For a Monday there were lots of fresh tracks.

      Convective cloud development in the afternoon.

      Excellent snow quality for the end of March.


      Still sunny in the pm with some clouds.


      Latte to Latte.

     There was sastrugi on some aspects in the alpine and at treeline.

      Steep and deep.

     Green Lake ice is breaking up. Water Skiing in the future??


FROM SEA TO SKY MIN REPORTS:

Chief Pascal Couloir: March 28, 2021

Bridge: March 29, 2021

Russet Natural Avalanche: March 29, 2021


VIDEOS:

Getting caught in an avalanche: GoPro Footage

Snow immersion after jump leading to Rescue: Dig Me Out


ARTICLES:

Dying for Powder: Adventure Journal

The women skiers of Afghanistan: Freedom on Slopes

Avalanche accident below Brennerspitze in Oberbergtal: Austria

Spring Touring Essentials: WildSnow

Avalanche shuts down section of Seward Highway: Alaska


      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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