12 Mar 2021

March 12, 2021

     YESTERDAY:

      Sunrise Thursday was at 06:34 Hrs. -7 with a 10-25 KPH ESE wind.

      Early Thursday am.


      Late start but walked on!


     Nice tracks from Wednesday.

      Rumbling Glacier.

      Smooth Groomers.

      Dry snow on North Aspects.

      Highway to Fissile


      High thin cloud cover later in the afternoon.


Weather Observations for March 12, 2021 taken at 06:00 Hours.

2240 meters      -8, Winds were 30-40 KPH S--Horstman Hut
2180 meters    -10, Winds were 30-45 KPH SSW--Whistler Peak
1860 meters      -5, Winds were 15-30 KPH S --Rendezvous 
1835 meters      -4, Winds were 10-25 KPH SW--Round House
1650 meters      -5,  0 cm in 12 Hrs, 0 cm in 24 Hrs, Base 274 cm --Pig Alley
1570 meters      -4,  0 cm in 12 Hrs, 0 cm in 24 Hrs, Base 200 cm--Catskinner
  660 meters      -1, Valley Temp, Max temp Yesterday was +7.0, 0.0 mm of precip yesterday.

       As of 07:00 Hrs this am we have overcast skies and unlimited visibility.


FORECAST:

Low to the North with surface ridging in the mix will bring a mostly overcast day in a Westerly flow aloft. There is even a chance of an isolated flurry this afternoon, with the FL hovering in the 1000-1200 meter range. Ridge strengthens slightly on Saturday with a mix of sun and cloud, warm temps with the FL hovering in the 1500-1200 meter range. A front arrives Sunday morning with light precipitation into early Monday am. Models are not in agreement with this outcome, time will tell. Unsettled Monday with the ridge rebuilding with sunny weather for Tuesday. Guesstimates: 0-trace by Saturday am, 0-1 cm by Sunday am, 12-18 cm by Monday am, 0-trace by Tuesday am.


      GOES IR image from this am.


        Low will send cloud our way today with the high keeping it dry.




.      Westerly flow aloft.


       Weak ridging on Saturday with a mix of sun and cloud. On the warm side.






.     Upper level low will bring precip on Sunday with warm temps.


.      Low for Sunday.


   AVALANCHE ACTIVITY:


     Sz 2.5 Sa on SW face of Fissile, from Wednesday evening.

      A different perspective. Luckily no one went for a ride over the cliffs.


     One subject was at the top of the bed surface, both had to climb back onto the ridge.

      Both subjects were rescued Wednesday night using a Talon Helicopter with night vision technology.



      Wet loose activity on the Lillooet Glacier.                                                               Al Collis Image

      Seepage on the Necwtinoaz Glacier.                                                                       Al Collis Image


.        On Whistler a few Sz 1 Sc soft slabs on steep North aspects. Xc with Sz 2.5 debris no slab.

      No new avalanches observed on Blackcomb yesterday. Wet loose activity in Lakeside.


.       Wet loose in Lakeside Bowl on Thursday.

      Wet loose on solar aspects yesterday.


From Sea to Sky avalanche advisory:

Avalanche Summary

Wind slabs remain possible to trigger, particularly on northerly aspects in the alpine. Large cornices remain a concern, especially during the heat of the day.

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 likely have a crust on the surface, and 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:

      Lines seem to be getting a little closer to Make It or Break It.

      Lakeside Bowl closed on Thursday afternoon.

      Sign line violator, if you get caught its one year off, including the bike park!!!


      Harmony Chair

      Cornice debris in most bowls.


      There were a lot of folks heading to Fissile yesterday.

      Amazing what wind and temperatures can do to the snow.



                        Recent Profile.



FROM SEA TO SKY MIN REPORTS:

Overlord Glacier Notch: March 10, 2021

Garibaldi: March 11, 2021


VIDEOS:

Snowboarder triggers avalanche on Shuksan Arm: Mount Baker

Powder Picker March 11, 2021: David Jones


ARTICLES:

Avalanche rescue groups illustrate the intensity of each mission: Colorado

Crews called to North Shore, Whistler for stuck skiers: NSSAR

Officials warn residents of potential wet avalanches this spring: Utah

Roof collapses a concern for weekend storm: Colorado


        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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