25 Feb 2021

February 25, 2021

     YESTERDAY:

      Sunrise was at 07:05 Hrs Wednesday morning. -9 with a 5-10 KPH SSW breeze.

      Tricouni Peak early Wednesday morning.

       Lots of wind transported snow on Wednesday am.

     Everyone was enjoying the soft snow!

     Old school Powder 8's. 

      Some aspects were not as deep but still skiing well!!

      Backcountry was busy.

     Wednesday February 24 2021. 15:00 Hrs. -6 with a 10-25 SW wind. +2 Deg in the valley.


         Image from the same timeframe as above. Cloud moved in by the afternoon.


      Clouds moved in during the afternoon.


Weather Observations for February 25, 2021 taken at 06:00 Hours.

2240 meters    -10, Winds were 60-80 KPH SE--Horstman Hut
2180 meters    -10, Winds were 70-90 KPH NE--Whistler Peak
1860 meters      -8, Winds were 30-50 KPH ESE --Rendezvous 
1835 meters      -7, Winds were 30-65 KPH SE--Round House
1650 meters      -5,  11 cm in 12 Hrs, 12 cm in 24 Hrs, Base 259 cm --Pig Alley
1570 meters      -6,  9 cm in 12 Hrs, 10 cm in 24 Hrs, Base 191 cm--Catskinner
  660 meters      -2, Valley Temp, Max temp Yesterday was +2.9, 0.0 mm of precip yesterday.


     As of 07:00 Hrs this am we have overcast skies, variable visibility and snowing lightly.


FORECAST:

A cold front in an upper level trough will bring light snow and strong winds for today in a North Westerly flow aloft. The FL may jump up to 800 meters but back down to surface by tonight. Snow will ease to flurries by early Friday morning. Unsettled weather for Friday with a mix of sun and cloud as the upper trough weakens. Saturday is looking mostly cloudy with a good chance another front arrives in the evening with periods of light snow into Sunday. Looking like more snow for March 1st. There are some inconsistencies in the model runs for Sunday and beyond, more on what may happen by tomorrow.          Guesstimates: 5-10 cm by Friday am, 0-trace by Saturday am, 1-5 cm by Sunday am, 8-12 cm by Monday am.


     GOES IR image from this am.


        Upper trough with a cold front going through today, strong winds.





      North Westerly flow aloft.

        Upper trough weakens with no precip but strong flow for Friday.






        Weak shortwave trough for Saturday am with a drying trend, but mostly cloudy.

        Mostly cloudy with some breaks for Saturday.


     AVALANCHE ACTIVITY:

      Sz 2 Sa two boot packers going to Husume yesterday.                                     Greg Newton Image


      Dry loose on solar aspects from Tuesday evening.

     Some point releases Wednesday afternoon.

     Dry loose Sa on Uper Disease Ridge in the afternoon.


     Loose dry Wednesday afternoon.

      Avalanche mitigation on Whistler produced a few isolated Sz 1 windslabs Sc.

     Except for some loose dry activity no slabs were observed on Blackcomb.


From Sea to Sky avalanche advisory:

Avalanche Summary

On Tuesday, a cornice fall triggered a size 2 wind slab near Whistler. Strong southwest winds have created thick wind slabs at upper elevations that may remain reactive to human triggers.

The incoming snow and strong southwest winds Wednesday night are expected to form storm slabs reactive to human triggers.

Snowpack Summary

The incoming snow and strong southwest winds Wednesday night are expected to form storm slabs reactive to human triggers on Thursday; especially in wind affected terrain.

Last weekend's storm delivered around 30 cm to the Whistler area and up to 60 cm in areas further west and south. Continued strong southwest winds have formed reactive wind slabs at treeline and above, while a rain crust has formed below 1300 m. 

The recent snow buried a variety of snow surfaces including wind pressed snow in the alpine, sun crusts on solar aspects, and a spotty layer surface hoar in some sheltered treeline areas. The kind of surface the recent snow buried will effect how long the recently formed slabs will remain reactive to human triggers.

The mid/lower snowpack is well settled and strong in most areas.


      INFORMATION & OBSERVATIONS:

      Rimed crust at 2240 meter.

      Spindrift Wednesday am.

      Brittle sun crust SW aspect 2100 meters.



      Top Station of 7th Heaven Chairlift.

      There were areas of wind affected snow.


      Always fun when playing in the sun on the steeps!!




FROM SEA TO SKY MIN REPORTS:

Wedgemont: Feb 24, 2021

Sproatt: Feb 24, 2021

Chocolate Cake: Feb 24, 2021


VIDEOS:

Avalanche Control: Europe

Powder Picker Feb 24, 2021: David Jones


ARTICLES:

Preliminary report released after avalanche kills Preston man: Utah

An avalanche has killed a ski tourer in the Lagorai Mountains: Italy

Ski Touring avalanche deaths double in 2020/2021 season: Pistehors.com

An unforgiving winter: Maggie Dresser

With Wyoming skier's avalanche death, national total climbs to 32: USA

Natural Sz 3.5 avalanche over Bourgea Left WI5: Sunshine Ski Area


      Submit your best avalanche photo for a pair of  Goggles Feb 1-28, 2021. Sea to Sky Area.

                                                    Thanks to Volkl Canada for sponsoring.

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