24 Apr 2021

April 24, 2021

     YESTERDAY:

      08:00 Hrs. +2 Deg C at 660 m. +1 at 1650 m. 0 at 1835 m. -3 at 2180 m.

      Clouds moved in fairly quickly Friday am.

     10:00 Hrs. +9 Deg C at 660 m. + 3 at 1650 m. +2 at 1835 m. -2 at 2180 m.

      Cloudy by 11:30 Hrs.


     12:00 Hrs. +12 Deg C at 660 m. +4 at 1650 m. +1 at 1835 m. -1 at 2180 m.

     14:00 Hrs. +13 Deg C at 660 m. +5 at 1650 m. +1 at 1860 m. -2 at 2180 m.

     Satellite image from same timeframe as above image.

     16:00 Hrs. +11 Deg c at 660 m. +2 at 16540 m. +1at 1835 m. -1 at 2180 m.

     18:00 Hrs. +10 at 660 m. +2 at 16450 m. +1 at 1835 m. -2 at 2180.

      Raining lightly at 19:00 hrs.


Weather Observations for April 24, 2021 taken at 06:00 Hours.

2180 meters      -2, Winds were 15-20 KPH SE--Whistler Peak 
1835 meters      -2, Winds were     0-5 KPH E--Round House
1650 meters       0, 2 mm in 12 Hrs, 2 mm in 24 Hrs, Base 231 cm --Pig Alley
  660 meters     +5, Valley Temp, Max temp Yesterday was +13.6, 0.8 mm of precip yesterday.


     As of sunrise, 06:00 Hrs we have overcast skies, variable visibility and it is snowing lightly.



FORECAST:

Front will push through this morning with periods of light precip in a South Westerly flow aloft. The FL will fluctuate between 1000-1700 m.  An upper trough will bring more light precip Sunday easing to showers by the afternoon, with a drying trend by Sunday night. A weak upper level ridge will bring unsettled weather for Monday with a mix of sun and cloud. Models are not in agreement for Tuesday into Friday but thinking several weak fronts will bring periods of light precip. Friday looks like a more potent front will bring steady light precip. Guesstimates: 12-16 mm by Sunday am, 2-6 mm by Monday am, 0-trace mm by Tueaday am, 2-6 mm buy Wednesday am.


     GOES image from this am.


        Low will bring periods of light precip for Saturday. 





      South Westerly flow aloft.

       Upper trough will bring periods of light precip, drying out later Sunday afternoon.






       Weak off shore ridging for Monday with a mix of sun and cloud.



      AVALANCHE ACTIVITY:

      Glacier burst has killed 8 workers near Chamoli, India. Article below.                                Net Pic

      No new avalanche activity observed locally.



From Sea to Sky Avalanche Advisory:

Avalanche Summary

At treeline and in the alpine, the new snow combined with light to moderate wind may build fresh and reactive storm slabs. The new snow may have a poor bond to the old snow surfaces which are mostly crusts. Below treeline will see rain that will keep snow surfaces wet and weak. Loose wet avalanches are possible. 

Cornices remain weak and fragile. They require a large berth from above and below as they are very unpredictable.

Over the past week, the region saw intense warming and sunshine. This resulted in a widespread natural avalanche cycle up to size 4. Many of these involved the full depth of the snowpack, running to the valley bottom. Last weekend, multiple large to very large wet slab avalanches were observed near Whistler, size 2-4. Many of these involved the full depth of the snowpack, running to the valley bottom.

 

Snowpack Summary

New snow will accumulate at treeline and in the alpine through the weekend building fresh and reactive storm slabs. Below treeline elevations will likely see rain. The new snow will be landing on a melt-freeze crust that extends to the alpine on solar slopes and 2100 m on polar slopes. It may bond poorly. Rain below treeline will likely keep the snow surfaces wet and weak.

Cornices are large and looming along ridgelines. They are weak and very unpredictable. 


      INFORMATION & OBSERVATIONS:

      High overcast in Pemberton, 08:00 Hrs. +4 Deg C with a high on Thursday of +20.7 Deg C.
      By 10:00 Hrs the cloud cover was getting thicker.

     Tantalus Range at 13:00 Hrs.

      Overcast and raining lightly in the Callaghan Valley. 19:30 Hrs.

      Snowing at 2240 m Friday evening. Sunset 20:18 Hrs.



FROM SEA TO SKY MIN REPORTS:

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


VIDEOS:


ARTICLES:

Uttarakhand glacier burst-8 killed 384 rescued in Chamoli: India

Backcountry tourer survives being draged 1000 feet in an avalanche in Colorado: OutThere

Army rescues motorists stuck between avalanches on Mountain Pass: Leh

Avalanche warnings in Svalbard: Norway

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