22 Apr 2021

April 22, 2021

     YESTERDAY:

     08:00 Hrs Wed April 21, 2021. +11 Deg C at 660 m. +5 at 1650 m. +4 at 1835 m. +2 at 2180 m.

      10:00 Hrs. +12 Deg C at 660 m. +9 at 1650 m. +6 at 1835 m. + 3 at 2180 m.

      Whistler just before noon.


     12:00 Hrs. +16 Deg C at 660 m. +9 at 1650 m. +7 at 1835 m. +3 at 2180 m.



     14:00 Hrs +18 Deg C at 660 m. +11 at 1650 m. +8 at 1835 m. +3 at 2180 m.

      Awesome cloud formations in the afternoon.

      16:00 Hrs. Clouded over. +18 Deg C at 660 m. +8 at 1650 m. +6 at 1835 m. +2 at 2180 m.

     18:00 Hrs. + 16 Deg C at 660 m. +9 at 1650 m. +8 at 1835 m. +3 at 2180 m.

     Satellite image from same timeframe as above image. Cloud had moved through in 2 hours.


      Alpin glow Wednesday evening.



Weather Observations for April 22, 2021 taken at 06:00 Hours.

2180 meters      -3, Winds were 50-70 KPH N--Whistler Peak 
1835 meters      -1, Winds were 10-25 KPH N--Round House
1650 meters     +1,  0 cm in 12 Hrs, 0 cm in 24 Hrs, Base 238 cm --Pig Alley
  660 meters     +1, Valley Temp, Max temp Yesterday was +19.2, 0.0 mm of precip yesterday.

      Sunrise 06:04 Hrs. Clear skies overhead with unlimited visibility. A few scattered clouds to the NE.


FORECAST:

The ridge will bring a sunny day in a Northerly flow aloft. Will see some cloud in the area.  The FL will spike to around 2200 m dropping down 1000 m tonight. A trough pushes through on Friday with mostly cloudy skies, some breaks, and light precip by Friday night. An upper low pushes through on Saturday with periods of light preip, easing off early Sunday morning. The weakening low will bring unsettled weather for Sunday, with mostly cloudy skies and the occasional break. Weak ridging will bring dry unsettled weather for Monday and Tuesday. Guesstimates: 0 mm by Friday am, 2-6 mm by Saturday am, 7-14 mm by Sunday am, 2-4 mm by Monday am, 0 mm by Tuesday am, 0 mm by Wednesday am.


      GOES image from this am.

       High still in control today, low to the North will bring change Friday. Some cloud in the mix.






.       Northerly flow aloft.


.           High pushed out, low moving down the coast. Mostly cloudy Friday with some breaks.




         Low will bring precip on Saturday.


     AVALANCHE ACTIVITY:

      Large glide avalanche on Forbiden Peak, Washington State.                                        NAC Image

      Another avalanche South of the Boarder. Johannesburg. Wet loose to wet slab.        NAC Image

     No new avalanche activity observed locally.


From Sea to Sky Avalanche Advisory:

Avalanche Summary

No new avalanche reports in this region since last weekend. In the neighboring South Coast Inland large wet slabs were reported from southerly aspects up to size 3.5 and ongoing wet loose avalanches have occurred up to size 2. 

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.

 

As the weather pattern changes and the temperatures drop, I suspect a decrease in natural avalanche activity. However, solar slopes remain suspect when the sun is shining. It can really pack a punch this time of year, even for short periods of time. 

Snowpack Summary

A solid melt-freeze crust exists to the mountain top on solar slopes and up to 2000 m on polar slopes. Above 2000 m on North facing terrain, you may find dry snow and a generally well-settled snowpack. Below treeline elevations, the snowpack has been isothermal but will likely lock up as freezing levels drop. 

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



      INFORMATION & OBSERVATIONS:

      08:00 Hrs. Another nice looking day in Pemberton. + 6 Deg C. High Tuesday was + 25.2 Deg C.

      High cirrus cloud showed up just before noon.

     More cloud by early afternoon.

      Overcast by 15:30 Hrs.

      We have had no precipitation from April 10-April 22 nd recorded at 660 m.

     Another amazing day in the mountains. Cloud cleared out by sunset.


FROM SEA TO SKY MIN REPORTS:

No new MIN reports as of 07:00 Hrs.


ARTICLES:

Waving goodbye to another winter: Avalanche Canada Backcountry Bulletin

Snow avalanche impact measurements in the Aosta Valley: Italian Alps

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