10 Feb 2021

February 10, 2021

    YESTERDAY:

      Sunrise Tuesday was at 07:33 Hrs. -16 with a 15-20 KPH S wind. Wind chill -25.


      Mostly cloudy in the early morning.

      More blue as the morning progressed.

      Tuesday Feb 9, 2021. 14:30 Hrs. -13 with a 15-20 KPH SW wind. -9 in the valley.

     Satellite image from Tuesday afternoon.

      Less cloud in the afternoon.

      Sunset was at 17:19 Hrs. More cloud cover moving in.


Weather Observations for February 10, 2021 taken at 06:00 Hours.

2240 meters    -15, Winds were 10-15 KPH NNW--Horstman Hut
2180 meters    -14, Winds were 15-20 KPH SW--Whistler Peak
1860 meters    -16, Winds were   5-10 KPH NNW --Rendezvous 
1835 meters    -17, Winds were   5-10 KPH ESE--Round House
1650 meters    -17, 2 cm in 12 Hrs, 2 cm in 24 Hrs, Base 246 cm --Pig Alley
1570 meters    -15, 1 cm in 12 Hrs, 1 cm in 24 Hrs, Base 179 cm--Catskinner
  660 meters    -12, Valley Temp, Max temp Yesterday was -7, 0.0 mm of precip yesterday.


    As of 07:00 Hrs this am we have overcast skies and unlimited visibility. Snowing lightly.


FORECAST:

Unsettled weather for today in a Northerly flow aloft. Cloudy this am with a mix of sun and cloud for most of the day. The FL will remain well below surface. Thursday is looking mostly sunny with the coldest temps yet. Cloudy Friday morning as a front approaches bringing periods of light snow Friday afternoon into Saturday. Temperatures will begin to moderate but the FL will remain below surface. Light snow forecasted for Saturday as well. Guesstimates: 0-trace by Thursday am, 0 cm by Friday am, 5-10 cm by Saturday am, 4-8 cm by Sunday am.


     Goes IR image from this am.
 

      Arctic front is hanging over Whistler today with cold temps.





Northerly Flow Aloft







      Weak frontal band moving in Friday afternoon with light snow.


     AVALANCHE ACTIVITY:

      Sa Sc??-Sz 1.5 on CC. From late Monday afternoon.

      On the debris.

     No new avalanche activity to report on Blackcomb. Sz 1.5 on CC from Monday evening.

     No new avalanche activity on Whistler. Some Sz 1 soft slabs on steep terrain.


AVALANCHE SUMMARY FOR SEA TO SKY AREA: 

Avalanche Summary

With cold temperatures gradually robbing the upper snowpack of cohesion, observations from Monday show a trend away from wind slab releases and toward small loose dry avalanches triggering in steep start zones with skier traffic. A few more small wind slabs were still able to be triggered with ski cutting in the Whistler area on Tuesday.

Recent skier triggered wind slabs have been limited to size 1. Explosive control work conducted prior to the weekend produced size 2 cornice and storm slab avalanches.

Snowpack Summary

Wind slabs on a variety of aspects are likely beginning to facet and lose cohesion as a result of ongoing cold temperatures. Recent sun exposure has formed weak crusts on primarily south aspects.

Below the surface, 50-100 cm of snow sits on a persistent weak layer that consists of facets at upper elevations, surface hoar in sheltered areas, a melt-freeze crust below 1900 m, and a sun crust on south-facing slopes. There could be more than 100 cm on this layer in wind loaded areas.

A crust from early December, currently considered dormant, may be found around 200+ cm deep in the snowpack.


      INFORMATION & OBSERVATIONS:

      Support Blind Skiers < click for information.

      There was some great skiing to be had on Tuesday.

      More cloud moved in during the late afternoon.

     Awesome snow conditions.

      Cornices are ripe, may become reactive with colder temps.


      Looking like we might see some precip on the weekend.



RECENT MIN REPORTS FROM SEA TO SKY: 

Cayoosh South Bowl: Feb 9, 2021


VIDEOS:

Backcountry Skiing Avalanche Education: Tom Wallisch

Powder Picker Feb 9, 2012: David Jones


ARTICLES:

197 still missing as Uttarakhand avalanche toll reaches 32: Northern India

Skier survives avalanche by clinging to tree before saving 2: Utah

Northwest Avalanche Centre Accident Summary: NWAC 20/21

5 People died in avalanches last week in: Austria

Deadly string of avalanches coincide with ripe weather conditions & increase in backcountry use: NBC NEWS

Covid restrictions might factor into avalanche deaths: NY Times

Report on the avalanche fatality in New Hampshire: Mount Washington Avalanche Center

Arctic outflow warning in effect: Whistler



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Mike Dempsey
604-932-5550
Your representative in Canada and the United States for ATMRECYCYCLINGSYSTEMS.COM and VORTEXDEPOLLUTION.COM in Canada

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