13 Mar 2021

March 13, 2021

     YESTERDAY:

      Sunrise Friday was at 06:32 Hrs. -4 with a 10-25 KPH SW wind.

      Many cloud layers on Friday!!

      A few patches of blue early in the am to the North.

      A weak impulse of moisture was moving in from the South.

      Cheakamus Glacier  It has certainly changed since then!

      Increasing cloud cover just prior to flurries.


      Power Flurry at 12:30 Hrs.


      Snowing lightly at the top of Mondays.

      Moist spring like conditions on Lower Dave Murray. High in the valley Friday was +8.


      Friday March 12, 2021. 14:00 Hrs. -1 with a 5-15 KPH ENE wind. +7 in the valley.


      Satellite image from the same timeframe as above.



      Looking North at 15:00 Hrs.

     Overcast with cat lights at 18:00 Hrs.


Weather Observations for March 13, 2021 taken at 06:00 Hours.

2240 meters      -2, Winds were 35-50 KPH SE--Horstman Hut
2180 meters      -3, Winds were 45-55 KPH S--Whistler Peak
1860 meters       0, Winds were 10-20 KPH SE --Rendezvous 
1835 meters       0, Winds were 10-20 KPH SE--Round House
1650 meters      -2,  0 cm in 12 Hrs, trace in 24 Hrs, Base 270 cm --Pig Alley
1570 meters      -1,  0 cm in 12 Hrs, trace in 24 Hrs, Base 196 cm--Catskinner
  660 meters       0, Valley Temp, Max temp Yesterday was +7.8, 0.0 mm of precip yesterday.


       As of 06:45 Hrs we have broken cloud and unlimited visibility.


FORECAST:

A weak upper ridge will bring unsettled dry weather for today in a Westerly flow aloft. The FL will spike at around 2000 meters dropping back down to 1000 meters tonight?, has the potential to remain very warm. An upper trough arrives Sunday morning with light steady precip into Monday morning. Weak ridging for Monday with unsettled weather, chance of some flurries in the am, unsettled by the pm with a mix of sun and cloud. Dry unsettled weather for Tuesday as well. Guesstimates: 1-2 cm by Sunday am, 18-22 cm by Monday am, trace-1 cm by Tuesday am, 0 cm by Wednesday am. More snow coming Wed-Fri, could see another 45 cm?


      GOES IR image from this am.


      High to the South, low to the North-unsettled dry weather for today.






      Westerly flow aloft.

      Low ushers in an upper trough with steady precip for Sunday. On the warm side.





        High pushes back Monday with more unsettled weather.



     AVALANCHE ACTIVITY:

      Wet loose from Thursday. Lakeside Bowl.

      Dry loose from Thursday.

     On Whistler Friday a few Na Sz 1 wet loose, some Sc Sz 1 on South aspects. More cornice control.

      No new avalanches were observed on Blackcomb.


      Cornice control on Regulator.

      Some large pieces of cornice.


      Moderate avalanche hazard in the alpine on Friday. Today as well.

From Sea to Sky avalanche advisory:

Avalanche Summary

Rising freezing levels and sunshine will increase the likelihood of avalanches and cornice failures on Saturday.

On Thursday, there was a report of a human-triggered size 2.5 wind slab avalanche on a southwest aspect at 2300 m, in extreme terrain. 

There have been reports most days this week of a few natural and/or human-triggered wind slab and dry loose avalanches, ranging between size 1-2, as well as natural size 1 loose wet avalanches on solar aspects at lower elevations.

Snowpack Summary

Wind slabs can be found on leeward slopes at upper elevations and remain possible to trigger. Solar aspects have a crust on the surface, that may become moist with rising freezing levels and direct sun. Soft, dry snow can be found in sheltered, shaded areas. 

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 was some cool light in the am.


      Looks Good, just manage the rocks in the choke! Hawaii 5O!

      Yeah, it was fun.

      Flurries arrived at around 11:30 Hrs.


      Not the best visibility for touring.


      Dave Murray downhill was fun!!


      That is a lot of snow cats.


FROM SEA TO SKY MIN REPORTS:

Sz 3.5: March 11, 2021

South Creek Overser Area:  March 12, 2021

Vista Bowl: March 12, 2021



VIDEOS:

Powder Picker March 12, 2021: David Jones


ARTICLES:

Mountain Conditions Report: Powell River 

Snowflakes as you've never seen them before: NY Times

Historic season taking its toll on responders: Wyoming



      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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