25 Mar 2021

March 25, 2021

     YESTERDAY:

      Sunrise on Wednesday was at 07:05 Hrs. -4 with a 25-60 KPH South wind.


      11:00 Hrs. -1 with a 5-10 KPH SSW breeze.

      A cloudy day.                                                                                                                           GD Pic


     Wednesday March 24, 2021. 14:00 Hrs. -2 with a 10-15 KPH West breeze.


     Satellite image from the same timeframe as above image.

       Mother nature decided on keeping it cloudy.



Weather Observations for March 25, 2021 taken at 06:00 Hours.

2240 meters      -7, Winds were 20-25 KPH NE--Horstman Hut
2180 meters      -6, Winds were 25-40 KPH N--Whistler Peak
1860 meters      -6, Winds were 15-20 KPH N --Rendezvous 
1835 meters      -5, Winds were   5-10 KPH N--Round House
1650 meters      -4,  trace in 12 Hrs, trace in 24 Hrs, Base 280 cm --Pig Alley
1570 meters      -4,  trace in 12 Hrs, 1 cm in 24 Hrs, Base 199 cm--Catskinner
  660 meters     +2, Valley Temp, Max temp Yesterday was +6.6, 4.0 mm of precip yesterday.


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


FORECAST:

Weak ridge of high pressure will bring unsettled weather this morning with more sun by this afternoon in a Northerly flow aloft.  May see some convective flurries this am. The FL will spike to around 1500 meters, dropping back down to around 700 meters tonight. Unsettled weather for Friday with a mix of sun and cloud. The ridge flattens on Saturday with  unsettled weather in the am, increasing cloud by the afternoon. A trough arrives Saturday afternoon with light precip and  moderate winds. The low offshore will send a strong frontal band through on Sunday with moderate precip and strong winds. Ridge rebuilds for Monday. Guesstimates: 0-trace by Friday am, 0 cm by Saturday am, 12-18 cm by Sunday am, 18-22 cm by Monday am. 

Has been very difficult to get a good feel for what is happening with the weather over the past few days. 


      GOES IR image from this am.


               Weak ridging this am, should see more sunny breaks as the day progresses. 






      North-North West flow aloft.


        Ridge deflects low to the North but still cloud spilling over for Friday.





       Ridge flattens on Saturday with unsettled weather in the am, trough arriving in the afternoon.

Low slides down the coast on Saturday.


      AVALANCHE ACTIVITY:

      An avalanche has killed a ski tourer in the Savoie, FR. Article below.                               Net Pic


      On Blackcomb minimal control work, some cornice work Xe Xb up to Sz 2.

      On Whistler, Xe Xc Sc Sz 1-1.5. Cornice work produced somd Sz 1.5. 

From Sea to Sky Avalanche Advisory:

Avalanche Summary

A few cornices were triggered naturally and from explosives on Tuesday and Wednesday. They were very large, as is expected at this time of year.

Looking forward, wind slabs and cornices may remain triggerable at higher elevations and use caution on sun-exposed slopes if clear skies prevail.

Snowpack Summary

Around 5 to 10 cm of snow accumulated Tuesday night, with strong wind from the southwest switching to northeast. New wind slabs likely formed during this time, which may linger in steep, alpine terrain features. This snow adds to the 30+ cm that accumulated on the weekend. All of the new snow sits above a widespread crust, with the exception of high north-facing terrain. Observations suggest the snow has bonded well to these old interfaces. There are currently no concerning weak layers in the snowpack, although a spotty early season facet layer deep in the snowpack could return as a problem later in the season.

Remember that cornices along ridgelines are large at this time of year and always have the possibility of failing naturally or from the weight of a human.



      INFORMATION & OBSERVATIONS:

      New snow was fun to turn on.                                                                                                 GD Pic

      Nice turns in Lakeside Bowl.                                                                                                   GD Pic

      View from False Peak.                                                                                                              GD Pic

      Cornices should still be on your radar.

       Moon setting early this am, looking cloudy.


FROM SEA TO SKY MIN REPORTS:

No more fluffy at the Duffey: March 24, 2021


VIDEOS:

Avalanche control with Daisy Bell: Switzerland


ARTICLES:

British Ski Tourer killed by avalanche in the Savoie: France

Update on the Sanctuary Chute avalanche fatality: CAIC 

Snowboarders escaped monster avalanche but not the law: 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.

No comments:

Post a Comment