4 Mar 2021

March 4, 2021

     YESTERDAY:

      Sunrise Wednesday March 3, 2021 was at 06:51 Hrs. -8 with a 25-40 KPH South wind.


      Overcast with flurries early in the am.

      Some breaks off in the distance.

      Power flurries in the am. Isolated flurries most of the day.

      Nice light in the afternoon.

.       Cornice debris in Blackcomb Bowl.

      Bright enough to make shadows.

      Wednesday March 3 2021. 14:00 Hrs. -4 Deg C with a 10-25 KPH ESE wind. +5 in the valley.

      Satellite image from the same timeframe.


      Nice light on Triplex Funnel. Later in the afternoon.

      Breaks at dusk.


Weather Observations for March 4, 2021 taken at 06:00 Hours.

2240 meters      -6, Winds were 50-75 KPH S--Horstman Hut
2180 meters      -5, Winds were 65-80 KPH ESE--Whistler Peak
1860 meters      -2, Winds were 25-50 KPH SE --Rendezvous 
1835 meters      -1, Winds were 20-45 KPH E--Round House
1650 meters       0,  0 cm in 12 Hrs, 1 cm in 24 Hrs, Base 244 cm --Pig Alley
1570 meters      -1,  0 cm in 12 Hrs, trace in 24 Hrs, Base 175 cm--Catskinner
  660 meters      -3, Valley Temp, Max temp Yesterday was +5.9, 0.0 mm of precip yesterday.


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


FORECAST:

Overcast early this morning with the approaching front bringing light-moderate precipitation in a South Westerly--Southerly flow aloft before noon. The FL might rise to 1800 meters (let's hope for 1500) with winds 80-100 +KPH possible. An upper level trough associated with a deep low will continue to bring periods of moderate to heavy precip into Friday.  Trailing cold front will bring the FL slowly down to surface by Friday night into early Saturday morning. Weakening upper level trough with some weak ridging Saturday will bring unsettled weather with a mix of sun and cloud with some afternoon flurries. Ridge shifts Sunday with a weak front bringing periods of light snowfall for Sunday with a chance of some sunny breaks in the afternoon. Drying trend next week with ridging, bring sunny skies for Monday. Guesstimates: 30-35 cm by Friday am above 1700 m,  30-35 cm by Saturday am, 1-2 cm by Sunday am, 5-10 cm by Monday am.


      GOES IR image from this am.


      Red sky in morning, sailors warning.


      Deep low will send a warm front with trailing cold front our way later this morning. 





      South Westerly-Southerly flow aloft.

.           Low will bring moderate-heavy snow on Friday. Cooling down!



        Cooler temps by Saturday with unsettled weather.



     AVALANCHE ACTIVITY:

      Detailed report on the avalanche that killed a snowboarder on Feb 18, 2021. Article below.

     Avalanche mitigation on Whistler yesterday produced some small soft wind slabs Sc.

     No new avalanche activity observed on Blackcomb yesterday. 

From Sea to Sky avalanche advisory:

Avalanche Summary

Large cornices (size 2) continue to be reactive to explosives. Explosive mitigation since Monday has also triggered a small (size 1) loose dry and storm slab avalanche. Minor pinwheeling has been observed on steep solar aspects in the afternoon.

Snowpack Summary

A slight rise in temperature and 5-10 mm of precipitation beginning in the afternoon on Thursday may increase the potential for wet loose avalanche activity on slopes experiencing warming for the first time. Watch for pinwheels and roller balls, as they are a clear indication of this problem. You can avoid them by staying off steep slopes when the snow becomes wet or slushy. 

Strong winds from the south at upper elevations have formed shallow wind slabs in lee terrain features that may be possible to trigger. Recent winds have varied in direction, so watch for wind slabs on a variety of aspects. 

In sheltered areas, 20 cm of recent snow sits over a layer that may consist of of facets, spotty surface hoar, and/or crusts on steep solar aspects and below 1500 m. A weak layer buried in mid-February is composed of a crust, facets or spotty surface hoar depending on elevation/aspect, and is now down 50-80 cm. There have been no recent avalanches reported on this layer. Large triggers, such as an avalanche in motion, cornice fall, or intense loading from snow, wind and/or a rapid rise in temperature could awaken these deeper weak layers.

The mid and lower snowpack is well settled and strong in most areas.


    INFORMATION & OBSERVATIONS:

.       Cornice debris in Blackcomb Bowl.


      Rimed statue top of 7th Heaven.

     If your on Blue Line above Davies Dervish you might get accosted by this grouse, feisty.

     Snowing on the pillows. 

     Nice turns in Shredder.

     There were some good turns to be had.


     Patches of blue later in the afternoon.

                  Crust at 1850 m with 30 cm facets North aspect Phalanx Glacier. Don Saugstad Pic

      Recent profile.




FROM SEA TO SKY MIN REPORTS:

No new reports as of 07:00 Hrs this am.


VIDEOS:

Whistler Powder Picker, March 3, 2021: David Jones


ARTICLES:

Today's date in 1910 was Canada's worst avalanche disaster: Rogers Pass

Time to consider Warming: Avalanche Canada

Avalanche warning for Western Alberta and Eastern B.C.: SPAW

Full details that killed a snowboarder on February 18, 2021: Bridger-Teton National Forest

Avalanche warning issued for Western Canada: Shaun Penner

Black Diamond recall for Pieps DSP Avalanche transceivers: Gear Junkies


        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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