5 Apr 2021

April 5, 2021

     YESTERDAY:

      Sunrise Sunday was at 06:42 Hrs. -1 in the valley. 

      08:00 Hrs. -11 at 2180 meters.


     13:00 Hrs. -7 at 1860 meters. -10 at 2240 meters.


     13:00 Hrs. +5 in the village. Broken Cloud. -1 at 1650 meters.

    15:00 Hrs. +7 Deg C in the valley. +1 at 1650 meters.

      Sunday evening.



Weather Observations for April 5, 2021 taken at 06:00 Hours.

2180 meters      -7, Winds were 10-20 KPH NNW--Whistler Peak 
1835 meters      -4, Winds were     0-5 KPH SSW--Round House
1650 meters      -8,  0 cm in 12 Hrs, 0 cm in 24 Hrs, Base 290 cm? --Pig Alley
  660 meters      -4, Valley Temp, Max temp Yesterday was +8.9, 2.2 mm of precip yesterday.

      Sunrise this am was at 06:39 Hrs. Clear skies and unlimited visibility.


FORECAST:

An upper ridge will bring sunny skies for today in a Northerly flow aloft. Will likely see some cloud development this afternoon. The FL could spike to 1800 meters today with daytime heating dropping to near or below surface by tonight. Unsettled for Tuesday with a mix of sun and cloud in the am, increasing cloud cover in the pm with some sunny breaks. Cold front arrives late Tuesday night into Wednesday with light precipitation and a rising FL, could see 1500 meters, hopefully no higher. Cool weak upper trough for Thursday with some isolated flurries and cloudy conditions. More intense frontal band for Friday with light to moderate precip with seasonal temps and strong winds. Guesstimates: 0 cm by Tuesday am, 4-8 cm by Wednesday am, 15-20 cm by Thursday am, trace-1 cm by Friday am, 20-25 cm by Saturday am.


       GOES IR image from this am.


       Ridge of high pressure strengthening for today. 





      Northerly flow aloft.

        High and low duke it out, unsettled in the am with cloudy skies in the late afternoon. 





        Cold front pushes through early Wednesday morning with precip and seasonal temps.

     Powder in the upper elevations on Wednesday.



      AVALANCHE ACTIVITY:

      North side of Famine Peak. Sz 2                                                                                    Al Collis Pic

      Perhaps a glide crack above the bergschrund?                                                               Al Collis Pic

      Closer perspective.  2300 m.                                                                                           Al Collis Pic

      Image of the photographer.                                                                                           Al Collis Pic

      Wet loose on Sisqua 2300 m.                                                                                            Al Collis Pic


     Sz 1.5 Sa partial burial Shovelnose Area from Sunday. MIN report below.         Hurley Dave Image

      Wet Loose on Sunday. Sz 1 Na dry loose noted on Whistler yesterday. Sz 1 wet loose as well.


From Sea to Sky Avalanche Advisory:

Avalanche Summary

A natural avalanche cycle was observed in the region on Saturday during the storm. On Sunday, this MIN describes triggering a small wind slab but in large terrain. Looking forward, wind slabs could still be triggered by riders at high elevations and a warming trend has the potential to increase avalanche activity as the snowpack weakens.

Snowpack Summary

Saturday's storm brought around 20 cm of snow to the region above 1600 m. The snow fell with strong southeast wind, so wind slabs may linger high elevations on lee terrain features. The snow overlies a hard melt-freeze crust everywhere except for north aspects above 1600 m, where it sits on previously dry snow. The snow surface may have already melted and frozen into a crust on sun-exposed aspects. Warm air and sunny skies will likely moisten the snow on Monday, particularly on sun-exposed slopes.

Cornices are large and looming along ridgelines. Their release is unpredictable, requiring a large berth if you're travelling above or below them.



      INFORMATION & OBSERVATIONS:

     Blue to the SE Sunday am.

      Clouds pushing through an hour later.

      Weekend Chutes

      Convective clouds in the afternoon.

     From South Coast Touring. 

Please note that there is a pit below First Pump, Mt Seymour just South of the peak. A backcountry skier fell into this hole and sustained injuries from the pit.
Whoever dug this pit and did not fill it back in, left a hazard that seriously injured someone. This should be obvious- but apparently it’s not to whoever dug this snow pit - if you dig a pit you must fill it back in.
All avalanche courses include this in the curriculum- as open pits are serious hazards.
(Some good folks at the scene have now filled in the pit) below.





FROM SEA TO SKY MIN REPORTS:

Sz 1.5 winslab: April 4, 2021

Watersprite Lake: April 4, 2021


VIDEOS:

Wet Avalanche: Utah


ARTICLES:

Spring avalanche Drama(and how to avoid it): WildSnow

It's the US' deadliest avalanche season in years. Experts say COVID is partially to blame: CNN

Heavy snow and wind loading raise avalanche danger: Alaska


     Winner of the goggles for March was Al Collis. Image below.

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