22 Feb 2021

February 22, 2021

     YESTERDAY:

      Groundhog Day. Just warmer!!

     One hour 40 minutes after getting in que.

      One of those new hoverboards.

      Blowing 50 KPH at 09:30 Hrs.

      Challenging visibility with icing at 2240 meters in the am.

     Nice turns to be had below treeline on Seventh Heaven.

      Always good turns when you know where to go!!


      Sunday February 21, 2021. 14:30 Hrs. -1 with a 30-60 KPH SSW wind. +3 in the valley.

     Big picture same timeframe as above image.

      Weak atmospheric river event on Sunday Afternoon. Broke up and split. :( 

      Fairly dry until the afternoon.

     Warm and wet in the afternoon. Max wind 07:00-17:00 Hrs. 81.5 KPH at 2240 m, 107 KPH at 2180.


Weather Observations for February 22, 2021 taken at 06:00 Hours.

2240 meters    -5, Winds were 30-60 KPH S--Horstman Hut
2180 meters    -4, Winds were 40-60 KPH ESE--Whistler Peak
1860 meters    -3, Winds were 20-35 KPH S --Rendezvous 
1835 meters    -2, Winds were  20-45 KPH SSW--Round House
1650 meters    -1,  11 cm in 12 Hrs, 11 cm in 24 Hrs, Base 255 cm --Pig Alley
1570 meters    -1,  11 cm in 12 Hrs, 11 cm in 24 Hrs, Base 189 cm--Catskinner
  660 meters   +4, Valley Temp, Max temp Yesterday was +4.0, 19.2 mm of precip yesterday.
Pemberton recorded 5.8 mm yesterday, Squamish 59.5 mm. We got ripped off!!!



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


FORECAST:

Unsettled weather for today with mostly cloudy skies this am in a Westerly flow aloft. We can expect periods of light precip later this am with a mix of sun and cloud. Precip should ease this afternoon with mostly cloudy skies into the evening. The FL which is around 1300 m will slowly drop back down to surface by tonight. Groundhog day for Tuesday with cooler temps and some weak ridging.. A weak ridge builds for Wednesday with cooler temps, a mix of sun and some cloud. A front arrives early Thursday am. Guesstimates: 1-4 cm by Tuesday am, trace-3 cm by Wednesday am, 5-10 cm by Thursday am, 4-6 cm by Friday am. 

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      GOES IR image from this am.


      Weak upper level trough with some light precip and warm temps. FL should drop by tonight.





     Westerly flow aloft. 

        Very weak ridging for Tuesday with unsettled weather and some flurries. Cooler Temps.






        Weak ridging for Wednesday with a mix of sun and cloud. Flurries in the mix as well.


.       Weak ridging Wednesday before the next front moves down the coast.

      AVALANCHE ACTIVITY:

      A snowmobiler is presumed dead after avalanche near Lamoille Canyon, Nevada. Article below.      

      An avalanche has killed a snowmobiler near Bear Lake, Idaho. Article below.                     Net Pic

     Minimal avalanche mitigation on Whistler. Xe Sc Sz 1 soft slabs.

      Avalanche control on Blackcomb produced some Sz 1 wind slabs Xe Sc

From Sea to Sky avalanche advisory:

Avalanche Summary

Periods of heavy snowfall and wind will likely drive a natural avalanche cycle on Sunday night, while lower elevations may experience wet loose avalanches triggered by the rain. Preliminary reports from Sunday suggest the first 15 cm of storm snow was reactive to human triggering, and these reactive storm slabs will get thicker overnight. Natural and human triggered avalanches will remain likely at treeline and alpine elevations across many parts of the region on Monday.

Snowpack Summary

Forecast snowfall amounts are variable across the region with 40 cm expected in coastal areas like Squamish and the Sunshine Coast and closer to 20 cm further inland near Whistler and Pemberton. The new snow and wind will form reactive slabs above the rain line. Recent snow is sitting above a potentially reactive interface consisting of surface hoar layer at treeline, a crust below 1800 m, sun crusts on steep south slopes, and faceted surfaces in the alpine. These interfaces could be failure layers for storm slabs.

A lingering persistent weak layer from late January is 80-120 cm deep and consists of facets at upper elevations and surface hoar in sheltered areas. Although this structure is suspect, we have no recent reports of avalanches on this layer.



      INFORMATION & OBSERVATIONS:

     Very strong treeline winds.

      Tree debris all over the terrain in Crystal.

      Nice snow and good vis mid mountain.

      Strong winds with some transportable snow.

     A different perspective. Teetering Rock.


     Couloirs, trees and rock bands were the place to be.

      Defying gravity.

     Ice and snow.

      Terrain Management!


     At 660 m we received 19.2 mm of precip yesterday. Squamish got 59.5 mm fo precip.



FROM SEA TO SKY MIN REPORTS:

Joffre Shoulder: Feb 21, 2021

Remote triggered on Round Mtn: Feb 21, 2021

Winds and warming on Chief Pascal: Feb 21, 2021


VIDEOS:

Full Burial rescue-Snoqualmie Pass: Packs (PPE) ???

Big Avalanche at McAtee Basin: Montana

Whistler Powder Picker, Feb 21, 2021: David Jones


ARTICLES:

Wet weather pushes up avalanche risk for the Sea to Sky, North Shore Mountains: News 1130

Ski tourer killed in an avalanche in the Dead Mountains: Austria

Avalanches claim lives of snowmobilers in separate incidents: Dangerous Conditions

2 snowmobilers survive avalanche one remains buried near Lamoille Canyon: Nevada

Snowmobiler dies in Bear Lake County avalanche: Idaho

Searching with dogs after avalanche buries Road 13: Norway

Parks Mountain Safety violations initiate closures: Powder Canada

Avalanche Danger closes Snoqualmie Pass: Washington State

Avalanche dangers close 3 Mountain Passes: Washington State


       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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