9 Mar 2021

March 9, 2021

     YESTERDAY:

      Sunrise Monday was at 06:40 Hrs. -11 with a 10-20 KPH South wind.

      Breaks by 09:00 Hrs.

       Late start but glad to just be there!!

      Awesome light in the am.

      Certainly unsettled in the am.

      There were some good turns to be had.

      Deep and Dry!!

      Everyone was having fun!!!!

     Nice light later in the afternoon.

      High thin cloud and sun at around 16:30 Hrs.


Weather Observations for March 9, 2021 taken at 06:00 Hours.

2240 meters    -10, Winds were 20-25 KPH SE--Horstman Hut
2180 meters      -8, Winds were 40-45 KPH E--Whistler Peak
1860 meters      -8, Winds were   5-10 KPH SE --Rendezvous 
1835 meters      -6, Winds were 10-20 KPH E--Round House
1650 meters      -7,  trace in 12 Hrs, trace in 24 Hrs, Base 286 cm --Pig Alley
1570 meters      -7,  0 cm in 12 Hrs, 0 cm in 24 Hrs, Base 211 cm--Catskinner
  660 meters      -4, Valley Temp, Max temp Yesterday was +4.5, 0.0 mm of precip yesterday.



      As of 06:30 Hrs we have overcast skies and unlimited visibility. Snowing lightly.


FORECAST:

Unsettled weather for today as a weak upper trough and weak upper level ridge mix it up in a Southerly-South Westerly flow aloft. The FL will likely spike at around 1000 meters dropping back below surface tonight. Unsettled Wednesday morning, with the ridge strengthening in the afternoon with sunny skies. Could see an inversion Wednesday. Thursday will be unsettled with more sun than cloud. Friday will be mostly cloudy with a slight chance of some isolated flurries. Saturday at this time is looking like a cloudy dry day. A much needed front arrives for Sunday! Guesstimates: 0 cm  expected for the next few days.


      GOES IR image from this am.


         Low will slide down the coast today, weak high pushing in from the NE.





     Southerly, switching to South Westerly flow today.


      High pressure strengthens for Wednesday as the low continues its slow migration South.







           More unsettled weather for Thursday. Low out in the Pacific will send some cloud our way.




     AVALANCHE ACTIVITY:

      An avalanche has killed a snowmobiler in the West Kootenays.  Article below.                   Net Pic

      West Kootenay avalanche fatality, Mount Reco. MIN Report below. 

       Vista Chute, March 8, 2021. MIN report below.                                                      JBudd9022 Pic

      Avalanche mitigation on Whistler yesterday produced Sz 1 soft slabs Xe. Sz 2 cornice releases Xc.


      Sz 1 soft slabs yesterday.


      Dry loose on some aspects.

      Avalanche mitigation on Blackcomb yesterday produced Sz 1 soft slabs  Sc.

      Sz 1 out of Ladies First.

      Dry loose in the am.

      Wet Loose Lakeside Bowl Monday afternoon.

      Small roof cornice drops.

From Sea to Sky avalanche advisory:

Avalanche Summary

On Sunday, small pockets of wind slab were reported releasing naturally and with ski cuts, primarily on northerly aspects near and above 1900 m. Small loose dry sluffs were also observed in steep terrain. 

Explosive mitigation on Saturday produced numerous large cornice and storm slab avalanches, with 50-100 cm crown depths. Explosives also released a very large (size 3) wind slab avalanche on a northeast aspect above 2000 m. 

Reports indicate that a natural avalanche cycle occurred during the storm on Friday, with small to large (size 1-2.5) avalanches releasing in the storm snow across aspects and elevations. See this MIN and this MIN for examples near Rainbow Mountain.

Snowpack Summary

50-100 cm of snow accumulated over the weekend that has been settling rapidly. The recent snowfall was accompanied by strong south winds, forming wind slabs on leeward slopes that remain possible to trigger. Massive cornices exist on ridgelines, which can act as triggers on slopes below.

The mid and lower snowpack is well settled and strong in most areas. A weak layer of facets buried in mid-February may still be found but has been gaining strength.


      INFORMATION & OBSERVATIONS:

      Snow Structures.

      Go Straight-Go Fast!

      The face of a cornice.

     The steeps have been a popular place to be!!

     That is a lot of rimed snow..

      Like ripe fruit getting ready to fall!!

     The backcountry was busy on Monday.

      Lots of tracks everywhere you looked.



FROM SEA TO SKY MIN REPORTS:

Mt Chief Pascal-West Ridge:March 7, 2021

Deep Pascale: March 7, 2021

Cassiope: March 8, 2021

Vista Chute Fx Line: March 8, 2021


Fatal Avalanche MIN Report:

Reco Mountain avalanche fatality: March 4, 2021


VIDEOS:

Large avalanche sweeps past Base Camp: Ladakh

Going for a ride in an avalanche: Germany

What and how to pack for a backcountry outing: Powder Cloud

Ski Cutting on Rappel: Vista Chute



ARTICLES:

A snowmobiler has died in an avalanche in the West Kootenays: Reco Mountain

Warming trend contributed to Kaslo avalanche fatality: Avalanche Canada

Skiers near Telluride are using radios to stay safe in the Backcountry Locales: Colorado

Recount of the avalanche tragedy near Valemount, B.C.: Feb 23, 2021

Why Park City Mountains backcountry gate is the deadliest in Utah: Ninety Nine 90

Black Diamond finally recalls faulty avalanche beacon: Powder Canada


       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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