25 Apr 2021

April 25, 2021

      YESTERDAY:

      08:00 Hrs Saturday April 24, 2021. +5 Deg C at 660 m. 0 at 1650 m. -1 at 1835 m. -1 at 2180 m.

     10:00 Hrs. +7 Deg C at 660 m. +2 at at 1650 m. 0 at 1835 m. 0 at 2180 m.

      Looking at Whistler Mountain.


      12:00 Hrs. + 8 Deg C at 660 m. +1 at 1650 m. 0 at 1835 m. -1 at 2180 m.

     14:00 Hrs. +8 Deg C at 660 m. +2 at 1650 m. +1 at 1835 m. +1 at 2180 m.

      Satellite iage from same timeframe as above.

     16:00 Hrs. +8 Deg C at 660 m. +2 at 1650 m. +2 at 1835 m. 0 at 2180 m.


     18:00 Hrs. + 7 Deg C at 660 m. +1 at 1650 m. 0 at 1835 m. -1 at 2180 m.


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

2180 meters      -5, Winds were 10-15 KPH NNE-Whistler Peak 
1835 meters      -3, Winds were   5-10 KPH NNW--Round House
1650 meters      -1,  10.3 mm in 12 Hrs, 12.1 mm in 24 Hrs, Base 240 cm --Pig Alley
  660 meters     +4, Valley Temp, Max temp Yesterday was +8.7, 5.8 mm of precip yesterday.

      In the alpine as of sunrise 05:59 Hrs, we have obscured skies and limited visibility.


FORECAST:

Slow low will bring overcast skies with periods of light precip in a weak South Westerly flow aloft. The FL will fluctuate in the 1200-1700 m range.  Ridge to the North will push the low out of the area sometime this evening with a drying trend into Monday morning. Unsettled weather for Monday with a mix of sun and cloud, likely more sun than cloud by the afternoon. A low in the Gulf of Alaska will send a series of weak troughs through our zone from Tuesday morning into Friday. Hopefully we will see some weak ridging by Saturday. Guesstimates: 2-4 mm by Monday morning, 0 mm by Tuesday am, 2-6 mm by Wednesay am, 4-8 mm by Thursday am.


      GOES image from this am.


        Slow weak low will bring periods of light precip today




      South Westerly flow aloft.

.      Ridge to the NE will push the low South, unsettled weather for Monday.





          Large low in the Gulf of Alaska will send periods of light precip for Tuesday.



      AVALANCHE ACTIVITY:

     Update on the avalanche that killed 10 workers in India. 



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:

      08:00 Hrs raining in Pemberton Saturday,  +8 Deg C. High Friday was +17.9 Deg C.

     Awesome day if you are a duck!!!

     No wind, just lots of circles.

      Bulk of the precip on Saturday stayed South of our zone.


FROM SEA TO SKY MIN REPORTS:

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


VIDEOS:


ARTICLES:

10 dead, 384 people rescued after avalanche near Uttarakhand: Northern India

9 people caught in avalanches in the past 10 days: Colorado

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