11 Jan 2021

January 11, 2021

     YESTERDAY:

      Sunday Jan 10, 2021. 08:30 Hrs. -3 with a 10-20 KPH East wind.

      Patrol avalanche control teams have been working hard to get terrain open!!

      20-40 KPH South winds around noon.

     There have been great dumps in the past week.

     Firm powder but still fun skiing in the alpine.

     Sunday January 10, 2021. 15:00 Hrs. -3 with a 15-40 KPH East wind. +1 in the valley.

      GOES IR image from Sunday afternoon. Same Timeframe as above image.

      A few breaks in the afternoon, most of the precip went South.


Weather Observations for January 11, 2021 taken at 06:00 Hours.

2240 meters      -5, Winds were 110-140 KPH ENE--Horstman Hut
2180 meters      -4, Winds were   85-115 KPH ENE--Whistler Peak
1860 meters      -2, Winds were     40-75 KPH SE --Rendezvous 
1835 meters      -2, Winds were     30-60 KPH ESE--Round House
1650 meters      -1, 13 cm in 12 Hrs, 14 cm in 24 Hrs, Base 245 cm --Pig Alley
1560 meters      -1,   6 cm in 12 Hrs, 7 cm in 24 Hrs, Base 174 cm--Catskinner
  660 meters      +1, Valley Temp, Max temp Yesterday was +1.7, 8.8 mm of precip yesterday.


       As of 07:00 Hrs this am we have obscured skies, limited visibility and it is snowing 2 cm/Hr.


FORECAST:

Wet, windy weather for today in a South west flow aloft as an atmospheric river heads our way.. A cold front will push through today with periods of light to moderate precip with strong winds. The FL will hover around 1500 meters. A warm front arrives for Tuesday with moderate to heavy precip.. Hopefully most of the warm air will go South of our area, along with some of the heavy precip.  Front on Tuesday will fissile out by Wednesday am, with a ridge building, bringing unsettled weather for the am with sunny skies by the afternoon. Unsettled Thursday with cooler temperatures and a mix of sun and cloud. Guesstimates: 25-30 cm above 1500 meters by 06:00 Tuesday, 35-45 cm above 1650 meters by Wednesday am, 0 cm by Thursday am.


     GOES IR image from this am.

      Cold front for today with wet windy weather.

   



      Warm front with trailing cold front for Tuesday. Warm air just South.





      Atmospheric River event.


                   High builds for Wednesday afternoon.



       Looks like Washington State & Oregon are getting the brunt of the precip Wednesday.


      AVALANCHE ACTIVITY:

     AC on Blackcomb yesterday produced some Sz 1-1.5 Xe Sc. Easily triggered slabs.

      Views of Fx Line on Cowboy Ridge yesterday am.

     This image taken just after the D3 avalanche on Cowboy Ridge Saturday. Joe Peplowski Image

     AC on Whistler yesterday produced  some Sz 1-2 Xe.

       Recent D3 avalanche in Colorado initiated by a high marking snowmobiler. CAIC Report

From Sea to Sky Advisory: 

Avalanche Summary

A large (size 3) avalanche was remotely triggered by skiers on Cowboy Ridge near Whistler on Saturday. The avalanche occurred on a north to northwest aspect at around 1900 m. The crown ranged reached up to 200 cm and was approximately 200 m wide. Check out this MIN for photos and more information. A similar avalanche was remotely triggered by skiers on a nearby westerly slope on Thursday; check out this MIN for more info and photos.

These avalanches are clear evidence that the weak layers described in the Snowpack Summary are still triggerable by riders and the consequence of being caught would be high.

Otherwise, small storm and wind slab avalanches were triggered by riders and naturally on Saturday and Sunday, generally 10 to 30 cm deep, on north to northwest aspects, and at treeline and alpine elevations.

Snowpack Summary

New storm and wind slabs will form during Sunday night into Monday's storm. The storm is expected to drop around 15 to 30 cm of snow, with the most in the west of the region. The storm will come with strong southwest wind so wind slabs are expected at higher elevations.

The snowpack is currently quite complex. Numerous layers of surface hoar may be found in sheltered terrain in the top 100 to 150 cm. The area of greatest concern is around 100 to 200 cm deep, where surface hoar or sugary faceted grains may sit above a hard melt-freeze crust from early December. There have been several recent large natural and human-triggered avalanches on this layer, particularly around Whistler and Pemberton.

Near the base of the snowpack there may be faceted grains above a crust from early-November, which was identified as the failure layer in recent sporadic large avalanche releases.



      INFORMATION & OBSERVATIONS:

      Snow is piling up, any guesses when the roof releases?

     Telemarking on Cougar Chutes.

      Lots of courses on Sunday.

      Always a good idea to have a partner in the mountains.

      Especially if you're a walking human.

     Best route into the alpine on a snow day.

      Lots of wind transported snow.

      Riming in the alpine, there was some icing with warm air aloft Sunday am.

LOCAL AVALANCHE CANADA MIN REPORTS:

Rohr Area: Jan 10, 2021

Wet Loose -South Coast: Jan 10, 2021

Disease Ridge: Jan 10, 2021


From South Coast Touring:

Mitch Sulkers-Oboe Creek

 We kept mostly in the trees during the day, but popped into the alpine to check out Saturday's Cowboy Ridge sz 3 and found hard slabs building with strong ESE winds.

At 1600m we found 235cm of snow with 140 on top of the December 29th surface hoar layer. We did get this layer to pop and slide with an extended column test.
Best skiing was in old growth and below treeline meadows on ENE aspects up to 40 degrees. In steeper zones, top 25 sluffing as loose dry while riding.
Team removed a new windfall on way out Singing Pass Trail.

VIDEOS:

Skier sets off large avalanche: Montana

Powder Picker Jan 10, 2021: David Jones


ARTICLES:

Skier, Snowmobiler narrowly escape separate avalanches in Tahoe Backcountry: California

'They're very Lucky'-Avalanche near Whistler partially buries skiers, but no injuries: CTV News

Fetch and Deposition: CSAC



WANTED any transceiver either working or not

$150 reward for trading in on a new Arva Neo Pro at $499 
$100 reward for trading in any transceiver in on an Evo 4 at $329 or Evo 5 at $385






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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