10 Mar 2021

March 10, 2021


     YESTERDAY:

          Sunrise Tuesday was at 06:38 Hrs.  -6 with a 15-25 East wind.

      Mostly cloudy with flurries in the am.

      Glimpses of light in the am.

      Certainly an unsettled weather day.

      Convective cloud development during the day.

      Nice turns down DOA


     Tuesday March 9, 2021. 14:00 Hrs. -4 with a 10-15 KPH ESE wind. +5 in the valley.

     Satellite image from the same timeframe as image above.

      Later in the afternoon.

     Convective flurries one minute.

      Wait awhile and blue sky with convective clouds.


Weather Observations for March 10, 2021 taken at 06:00 Hours.

2240 meters    -10, Winds were 10-15 KPH S--Horstman Hut
2180 meters    -10, Winds were 20-30 KPH WSW-Whistler Peak
1860 meters      -8, Winds were 10-15 KPH SE--Rendezvous 
1835 meters      -7, Winds were 10-20 KPH SSW--Round House
1650 meters      -6, trace in 12 Hrs, trace in 24 Hrs, Base 282 cm --Pig Alley
1570 meters      -5, trace in 12 Hrs, trace in 24 Hrs, Base 206 cm--Catskinner
  660 meters      -2, Valley Temp, Max temp Yesterday was +6.8, 0.0 mm of precip yesterday.


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



FORECAST:

A weakening cold front will bring overcast skies this am with a chance of some flurries in a Westerly flow aloft. A ridge of high pressure will strengthen by the afternoon with sunny skies for the remainder of the day. The FL will spike at around 1000 meters and drop back down to surface tonight. Thursday will continue to see a ridge in the area with a mix of sun and cloud in a Northerly flow aloft. Same for Friday! Saturday will see mostly cloudy skies as the ridge migrates East allowing cloud to move in before another weak Pacific front arrives for Sunday. Guesstimate: 0-1 cm by Thursday am, 0 cm by Friday am, 0 cm by Saturday am, 0-1 cm by Sunday am. 5-10 cm by Monday am.


      GOES IR image from this am.


      Ridge will build by the afternoon with sunny skies.





     Westerly flow aloft.

       Ridge dominant on Thursday but some cloud will spill in from the low to the North.






        Unsettled Friday with a mix of sun and cloud.

       Low will send some cloud our way on Friday.


     AVALANCHE ACTIVITY:

      Fresh wet loose for yesterday in Lakeside Bowl.

     Wet loose debris from Monday afternoon in Lakeside.

      Pinwheeling Tuesday before noon.

     Fresh wet loose Tuesday afternoon.

      No new avalanches to report on Whistler, some wet loose activity on solar aspects.

      Fresh tracks old debris on Fissile.

From Sea to Sky avalanche advisory:

Avalanche Summary

On Monday, there were a few explosive triggered size 2 cornices, and a few natural and human-triggered size 2 wind slab avalanches reported. 

On Sunday, small pockets of wind slab were reported releasing naturally and with ski cuts, primarily on northerly aspects near and above 1900 m. Small loose dry sluffs were also observed in steep terrain. 

Explosive control on Saturday produced numerous large cornice and storm slab avalanches, with 50-100 cm crown depths. Explosives also released a very large (size 3) wind slab avalanche on a northeast aspect above 2000 m. 

Reports indicate that a natural avalanche cycle occurred during the storm on Friday, with small to large (size 1-2.5) avalanches releasing in the storm snow across all aspects and elevations. 

Snowpack Summary

50-100 cm of snow fell over the weekend and has been settling rapidly. The recent snowfall was accompanied by strong south winds, forming wind slabs on leeward slopes that remain possible to trigger. Massive cornices exist on ridgelines, which can act as triggers on slopes below.

The mid and lower snowpack is well settled and strong in most areas. A weak layer of facets buried in mid-February may still be found but has been gaining strength.



      INFORMATION & OBSERVATIONS:

     There is always good snow somewhere.

      Dry on North aspects.

      Moist snow on a sun crust below treeline South aspect.

      Lakeside bowl was closed around noon yesterday. 


      Tracks on Blackcomb Peak from Monday evening.

     Tourer's were getting some steep lines in yesterday.

FROM SEA TO SKY MIN REPORTS:

Seagrams: March 9, 2021


VIDEOS:

New avalanche on Zojila Pass Road: Ladakh

Powder Picker March 9, 2021: David Jones


ARTICLES:

Using the avalanche forecast for trip planning: WildSnow

SFU grad develops classification system to keep recreationists safe: Anne St Claire 

The art of doing nothing in avalanche terrain: Backcountry Magazine

How researcher cracked the code of predicting Rocky Mountain Snowpack: University of Saskatchewan


  Submit your best avalanche photo for a pair of  Goggles March 1-31, 2021. Sea to Sky Area.

                                                    Thanks to Volkl Canada for sponsoring.


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