24 Feb 2021

February 24, 2021

     YESTERDAY:

     More blue than cloud early Tuesday am.

     Cloud did move in fairly quickly.

      Wait ten minutes and there would be some flurries.

     Power flurries in the valley.

      Above the flurries in the valley.

      Tuesday Feb 23, 2021. 14:00 Hrs. -12 with a 5-10 SE wind. +2 in the valley.


      Strong onshore flow Tuesday afternoon.

     There were some good turns to be had.

     Later in the afternoon.


Weather Observations for February 24, 2021 taken at 06:00 Hours.

2240 meters    -13, Winds were  20-30 KPH S--Horstman Hut
2180 meters    -12, Winds were 15-30 KPH W--Whistler Peak
1860 meters    -12, Winds were 10-15 KPH S --Rendezvous 
1835 meters    -10, Winds were   5-10 KPH SSW--Round House
1650 meters    -13,  1 cm in 12 Hrs, 5 cm in 24 Hrs, Base 253 cm --Pig Alley
1570 meters    -11,  1 cm in 12 Hrs, 3 cm in 24 Hrs, Base 186 cm--Catskinner
  660 meters      -8, Valley Temp, Max temp Yesterday was +2.4, 1.5 mm of precip yesterday.



      As of 07:00 Hrs this am we have clear skies and unlimited visibility.


FORECAST:

A weakening upper ridge of high pressure will bring some brief sunny weather for this morning with mostly cloudy skies by the afternoon in a Northerly flow aloft. The FL will hover below surface. Should see some light snowfall later this evening as the next frontal band pushes through into Thursday. Periods of light/moderate snow with strong winds for Thursday with seasonal temperatures. Snow easing to flurries by early Friday morning with the ridge rebuilding with a mix of sun and cloud for Friday. Some light flurries possible Friday night? Unsettled with mostly cloudy skies for Saturday. Guesstimates: 10-15 cm by Thursday am, 4-8 cm by Friday am, 0-trace by Saturday am, 1-3 cm by Sunday am.


     GOES IR image from this am.


       Ridge will weaken today with clouds in the afternoon, light snow tonight. Seasonal Temps.





      Northerly flow aloft.

       Cold front Thursday with strong winds. Cool temps in a Northerly flow.






       Unsettled weather for Friday. Mostly cloudy.



          AVALANCHE ACTIVITY:

          An avalanche has killed a snowboarder in Broken Thumb Couloir, Wyoming. Article below.    


     Avalanche mitigation on Whistler produced Sz 1 soft slabs Sc. Some cornice control Sz 2.5.

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


     Sa Sz 1 dry loose sluff on ID High. 

     Old powder marks on Triplex.

     Some soft slabs were developing.

      Even at tree line soft slabs were building.

From Sea to Sky avalanche advisory:

Avalanche Summary

Sunday night's storm resulted in a natural avalanche cycle, with storm slabs up to size 2.5 on wind loaded features. Explosive control on Monday produced numerous size 2-2.5 storm slab avalanches (roughly 50 cm thick).  

Continued strong southwest winds have created thick wind slabs at upper elevations that will likely remain reactive to human triggers for several days.

Snowpack Summary

The 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:

      Defying gravity.

     There were some amazing clouds on Tuesday.

      Cumulus congestus cloud Tuesday afternoon. Some great power flurries in the afternoon.

      Power flurries add up, 4 cm recorded at 1650 meters yesterday, 2 cm at 1570 meters.

      Still areas with sastrugi.

     Not that many ski tourers out Tuesday.

      It certainly was unsettled.

      Assuming that Blackcomb will be open into May with how much snow making is occuring.

      Finely tuned jets.


     Not many tracks out there considering how good the snow was!!


      Snow Moon will be on February 27, 2021.


       Recent test profile. 2/20/2021



FROM SEA TO SKY MIN REPORTS:

No MIN Reports yet this am.

From South Coast Touring:

Russet Laps: Dan Cudlip


VIDEOS:

Ultralights & Skiing: France

Large Destructive Avalanche: Montana

Solving for Z: A calculus of risk

Powder Picker Feb 23, 2021: David Jones


ARTICLES:

Skier killed in 1000 Ft fall in Teton Avalanche: Wyoming

Widow sues Lake Tahoe Ski Resort after skier killed in 2020 avalanche: Alpine Meadows

Update on the avalanche that killed a snowmobiler near Chetwynd: Northern B.C.

MIN report on the above event: 2021-02-20

As deaths surge, scientists study the link between climate change and avalanches: Inside Climate News

Forecasters talk about what caused it, How do you manage it, and when will it heal: Unstable Snowpack Nationwide

'Extreme' avalanche danger continues on mountain passes: Washington State

Know where not to Go: Powder Cloud

ENSO Update, Feb 22, 2021: NOAA


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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