10 Apr 2021

April 10, 2021

      YESTERDAY:

      Not much to see in the alpine Friday am, 07:00 Hrs. -11 with a 55-75 KPH East wind.

      As of 09:30 Hrs it was snowing lightly in the village. 0 Deg C.

     12:00 Hrs. Snowing lightly. +1 in the valley. -4 at 1650 m.

      14:00 Hrs April 9, 2021. +2 Deg C in the valley. -3 at 1650 meters. Snowing lightly.


      Satellite image from the same timeframe as above image.

     18:00 Hrs. Snowing lightly. High at 660 meters yesterday was + 2.5 Deg C.




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

2180 meters    -13, Winds were 30-40 KPH WSW--Whistler Peak 
1835 meters    -11, Winds were  20-30 KPH SW--Round House
1650 meters      -9, 7 cm in 12 Hrs, 15 cm in 24 Hrs, Base 290 cm --Pig Alley
  660 meters      -3, Valley Temp, Max temp Yesterday was +2.5, 0.6 mm of precip yesterday.


Max wind speed yesterday at 2180 m was 140 KPH 
Max wind speed yesterday at 1835 m was   90 KPH
As usual most of the precip went South. Squamish received 27.0 mm yesterday.


      As of sunrise, 06:29 Hrs this am we have broken cloud and unlimited visibility.


FORECAST:

A weakening upper trough will push through today in a Northerly flow aloft. A mix of sun and cloud this am with some flurries before the high pressure begins to build for this afternoon. Should see mostly sunny skies by the pm with the FL rising to around 1000+ meters with daytime heating, dropping below surface by Sunday am. Ridge strengthens for Sunday with sunny skies and the FL rising to 1500+ meters with daytime heating. Mostly sunny weather for the week, with a bit of cloud in the mix. Daytime heating will bump the FL up each day maxing out next Saturday. Guesstimates: trace-1 cm by Sunday am.


      GOES image from this am.


      Weak upper trough exits, ridge starts building with sunny skies by the pm.






      North Westerly flow transitioning to Northerly flow this am.

.      500 MB image from this am.

.     High pressure strengthens on Sunday.



       High in control, looks like we could see a Rex Block for awhile.




      AVALANCHE ACTIVITY:

       Touchy storm slabs on the North Shore. MIN report below.                                             Juliang Pic



From Sea to Sky Avalanche Advisory:

Avalanche Summary

Fresh storm slabs will continue build overnight and will very likely be reactive to human triggering on Saturday, especially where wind loading occurs. Expect snow to shed naturally from sun-exposed slopes during the day.

Small (size 1) natural wind slab were observed with ongoing wind transport of recent snow in the Whistler area on Thursday.

A natural avalanche cycle was observed in the region on Saturday during the last storm. On Sunday, there were a few size 1-1.5 human triggered wind slab avalanches reported. This MIN describes triggering a small wind slab in large terrain.

Snowpack Summary

15-25 cm of new snow is expected to accumulate by Saturday morning, bringing the total this week to about 25-40 cm. Strong southwest winds are expected to accompany the new snow, likely forming fresh and reactive slabs in many areas.

The recent storm snow sits on a crust on sun-exposed aspects, and on all aspects below about 1600 m. It likely sits on soft snow or wind slabs on north aspects. 

Cornices are large and looming along ridgelines. Their release is unpredictable, requiring a large berth if you're travelling above or below them.


      INFORMATION & OBSERVATIONS:

      Snowing in Olympic Plaza Friday am.

      12:00 Hrs. Raining lightly. +7 Deg C, in Pemberton.


      Snowing at 16:00 Hrs. +2 Deg C at 660 meters.


     18:00 Hrs Pemberton. +7 Deg C. Trace recorded there yesterday.



FROM SEA TO SKY MIN REPORTS:

Touchy Storm Slabs: April 9, 2021


VIDEOS:

Can dynamite save you from an avalanche: AvyBrains


ARTICLES:

An avalanche has killed 2 snowmobilers in Yugyd Va National Park: Russia

65-year-old survived hours under an avalanche: Austria

Telski uphill access opens Saturday: Telluride

Challenging springtime snow conditions in Alberta's Mountain Parks: CTV News

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