26 Apr 2021

April 26, 2021

     YESTERDAY:

     08:00 Hrs. + 5 Deg C at 660 m. -1 at 1650 m. -3 at 1835 m. -5 at 2180 m.

     10:00 Hrs. +7 Deg C at 660 m. -1 at 1650 m. -2 at 1835 m. -5 at 2180 m.

      Moist morning.


     12:00 Hrs. +8 Deg C at 660 m.

     14:00 Hrs +10 Deg C at 660 m. +4 at 1650 m. 0 at 1835 m. -3 at 2180 m.

      16:00 Hrs. +9 Deg C at 660 m. +1 at 1650 m. 0 at 1835 m. -2 at 2180 m.


Weather Observations for April 26, 2021 taken at 06:00 Hours.

2180 meters      -5, Winds were 10-15 KPH SW--Whistler Peak 
1835 meters      -4, Winds were   5-10 KPH N?--Round House
1650 meters      -3,  2.6 mm in 12 Hrs, 5.6 mm in 24 Hrs, Base 235 cm --Pig Alley
  660 meters     +4, Valley Temp, Max temp Yesterday was +9.9, 3.2 mm of precip yesterday.


      As of sunrise, 05:57 Hrs we have broken cloud and unlimited visibility.


FORECAST:

An upper level ridge will slowly dry the area out today with unsettled weather in a light North-North Westerly flow aloft. More cloud than sun this am with more sun than cloud by this afternoon. The FL could go up to 1800 meters dropping back down to around 1200 m tonight. The valley cloud should disipate sometime this am. Tuesday will start out overcast as the next weak upper level trough pushes in from the North. A warm front will arrive in the afternoon (16:00 Hrs?) with periods of light precip. The slow moving front will bring light precip Wednesday with rising freezing levels. This pattern will continue into Saturday. We might see some sun again on Sunday. Guesstimates: 0 mm by Tuesday am, 1-4 mm by Wednesday am, 4-8 mm by Thursday am, 1-4 mm by Friday am.


      GOES image from this am.


       Ridge will bring unsettled weather for today, mostly sunny by this pm.





      Weak North-North Westerly flow.


         The rather significant low will be in control for most of the week.





         Low will send impulses of precip our way with rising temperatures.




     AVALANCHE ACTIVITY:

      Updated article on the avalanche tragedy in Northern India below.                                  Net Pic


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 in Pemberton. +8 Deg C. High Saturday was + 13.6 Deg C.


.       In the alpine at 08:00 Hrs we have overcast skies, variable visibility and snowing lightly. 

      Snow line came down to 1000 m.

     Sunday afternoon. Did break eventually, could see the moon Sunday night.

      High pressure moved in last night, valley cloud should eventually burn off.




FROM SEA TO SKY MIN REPORTS:

No new local MIN reports as of 07:00 Hrs.


VIDEOS:

Avalanche blocks the Chandra River: Northern India


ARTICLES:

Death toll rises to 12 in Uttarakhand avalanche tragedy: Northern India

This winter broke backcountry records, and not in a good way: SKI

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