15 Jan 2021

January 15, 2021

      YESTERDAY:

         Sunrise was at 08:06 Hrs Thursday. -8 with a 15-20 S wind.  

                                                                                              

     Looking South West at 10:00 Hrs.

     Nice light in the am.

      Lenticular Clouds forming by the afternoon.

     Mostly a grey day but some great vistas.


      Thursday Jan 14, 2021. 15:00 Hrs. -1 with a 10-20 ESE wind. +1 in the valley.

      Large drifts at tree line from last storm.


     Awesome light in the pm.

      Some breaks later in the afternoon.


     Just before sunset.


Weather Observations for January 15, 2021 taken at 06:00 Hours.

2240 meters      -5, Winds were 40-70 KPH SE--Horstman Hut
2180 meters      -4, Winds were 35-50 KPH SE--Whistler Peak
1860 meters      -3, Winds were 15-30 KPH S --Rendezvous 
1835 meters      -2, Winds were 10-30 KPH SSW--Round House
1650 meters      -1, 2 cm in 12 Hrs, 2 cm in 24 Hrs, Base 237 cm --Pig Alley
1570 meters      -2, 1 cm in 12 Hrs, 1 cm in 24 Hrs, Base 167 cm--Catskinner
  660 meters       0, Valley Temp, Max temp Yesterday was +1.5, 0.0 mm of precip yesterday


      As of 07:00 Hrs we have broken cloud and unlimited visibility.


FORECAST:

Trailing end of the cold front will push through this morning with overcast skies in a Westerly flow aloft. Mid morning the upper flow will switch to North Westerly as a weak ridge brings unsettled weather with a mix of sun and cloud. The freezing level will slowly drop down to surface by tonight. Cloudy on Saturday as the low to the North keeps the ridge at bay. Dry with a few sunny periods until a weak frontal band arrives Saturday afternoon with periods of light precip into early Sunday morning. Dry but overcast once the precip stops Sunday morning. Ridge slowly builds back in with unsettled weather for Monday. Guesstimates: trace-1 cm by Saturday am, 4-8 cm by Sunday am, 0 cm by Monday am. Dry weather pattern for the remainder of the week with a few minor disturbances. 


     GOES IR image from this am.


      Ridge pushes North for unsettled weather today.





      Cloudy skies for most of the day with a weak frontal band arriving Saturday evening.





      Ridge pushes back for Sunday with overcast skies.




      AVALANCHE ACTIVITY:

     Old wet loose on Rainbow.

      AC on Whistler yesterday produced Sz 1-1.5 Xh Xe Xc.

     No new avalanche activity recorded on Blackcomb yesterday.

     Avalanche control on Wednesday in Surfs Up. Xt Taken Wednesday.                   Mike Caverley Pic

      Image taken of Surfs Up on Thursday.  Different perspective.                                   Chris Britt Pic



      Storm activity from the Brandywine Area. Na up to Sz 3.                                            Al Collis Pic

     Lots of Na old activity in the Brandywine area.                                                             Al Collis Pic

      High avalanche danger in Switzerland. Article below.                                                       Net Pic


From the Sea to Sky Avalanche Advisory:

Avalanche Summary

On Wednesday, there were reports of a natural storm slab avalanches cycle up to size 3. There were also several that stepped down to deeper weak layers resulting in very large (size 3-4) persistent slab avalanches. Check out this MIN describing a large cornice-triggered avalanche in the Blackcomb sidecountry.

Last Saturday, a large (size 3) avalanche was remotely triggered by skiers on Cowboy Ridge near Whistler. 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 a few days before; check out this MIN for more info and photos.

Snowpack Summary

40-60 cm of recent storm snow accompanied by strong to extreme westerly wind has built reactive storm and wind slabs at upper elevations. These slabs may be extra sensitive where they overlie surface hoar in sheltered terrain or a crust on solar aspects. Warmer temperatures and a period of rain overnight Tuesday has formed a thin surface crust up to 1900 m.

The snowpack is currently quite complex. Layers of surface hoar as well as sugary faceted grains above a hard melt-freeze crust from early December may be found down 100 to 200 cm. Last weekend, several large natural and human-triggered avalanches on this layer occurred, with the hot spots being around the Whistler backcountry.

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:

     Grey morning, cloudy to the North.

     Variable snow conditions on the lower elevations.

      Unsettled weather in the pm.

     Front slowly moved in.

     There were pockets of nice snow.

      From South Coast Touring.

     New crust too deal with.

     Awesome light for most of the afternoon.

      Wind transported snow on Thursday.                                                                      Ken Nickel Pic


LOCAL AVALANCHE CANADA MIN REPORTS:

Pascal Trees: Jan 14, 2021

Hanging Lake: Jan 14, 2021

Decker 9Th Hole: Jan 14, 2021

Casper Creek Sz 3.5: Jan 14, 2021


VIDEOS:

Powder Picker Jan 14, 2021: David Jones


ARTICLES:

Two hikers survive falls in Tuckerman's Ravine: New Hampshire

Common ground in avalanche like events: Physics

The avalanche doesn't care: Outside

High avalanche danger rating in : Switzerland

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