7 Apr 2021

April 7, 2021

      YESTERDAY:

      As of 07:00 Hrs Tuesday the temperature in the valley was -3. At 1650 meters it was -6 Deg C.

     High thin cloud in the early am. -6 Deg C at 2180 meters at 07:30 Hrs..

      Whistler Bowl Tuesday am.

     Clouds were moving in fairly quickly.

     10:45 Hrs.



      12:00 Hrs. + 8 in the valley. +3 at 1650 meters.

     13:00 Hrs. 


     Mostly cloudy by 14:30 Hrs.

      Satellite image from same timeframe as above.

      A few more blue patches around 15:30 Hrs.

      20:00 Hrs -4 Deg C at 2240 meters. -2 at 1835 meters. -1 at 1650 meters. +6 at 660 meters.


Weather Observations for April 7, 2021 taken at 06:00 Hours.

2180 meters       ? no data, Winds were  KPH--Whistler Peak 
1835 meters      -4, Winds were 15-40 KPH SE--Round House
1650 meters      -2,  trace in 12 Hrs, trace in 24 Hrs, Base 281 cm --Pig Alley
  660 meters     +3, Valley Temp, Max temp Yesterday was +11.4, 0.0 mm of precip yesterday.
Not sure why but no data at 2180 meters.

FL spiked at 1900 meters yesterday at around 13:45 Hrs. 


      As of 06:00 Hrs this am we have overcast skies and variable visibility.


FORECAST:

A cold front will push through today in a Westerly-South Westerly flow aloft. Periods of light precipitation today will ease to showers by tonight. Weak ridging will bring unsettled weather for Thursday with a mix of sun and cloud. in a Northerly flow aloft Another frontal band arrives early Friday morning with periods of light precipitation through the day into Early Saturday morning. Weak ridging will bring unsettled weather by sunrise on Saturday with another unsettled weather day. Ridge strengthens on Sunday with sunny weather in the cards. Ridge of high pressure will bring nice weather into Thursday with warm temps. Guesstimates: 10-15 cm by Thursday am, trace-1 cm by Friday am, 12-18 cm by Saturday, 0-trace by Sunday am.


Goes IR image from this am.



       Low will send a cold front our way today.





      West-South Westerly flw aloft.

        Weak upper trough and weak ridging will bring unsettled weather for Thursday.






        Another frontal band coming our way as the low moves down from the North.


      Low with cool temps moving through on Friday.



      AVALANCHE ACTIVITY:

      Sun effect in the Callaghan area.                                                                                   Al Collis Pic

      ESE thru WSW MFcr up to 1900 m. North aspects still dry as of Tuesday.                  Al Collis Pic


       Recent avalanche activity on Hatcher Pass, AK closed road. Article below.    



From Sea to Sky Avalanche Advisory:

Avalanche Summary

With high snow accumulations and strong southwest winds expected on Wednesday, fresh and reactive slabs are likely to increase in reactivity as the day goes on.

A natural avalanche cycle was observed in the region on Saturday during the 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 snow is expected to accumulate throughout the day, adding to the 20 cm that fell over the weekend. The precipitation is likely to fall as rain below around 1000 m. 

The new snow sits on a crust on sun-exposed aspects, and on all aspects below 1600 m, and on soft snow or wind slabs on north aspects. Southwest winds are expected to create fresh and reactive slabs during the day.

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:

      07:30 Hrs Tuesday am. 

     High cloud over Wedge Mountain early Tuesday am.

      Horstman Glacier Tuesday am.

      There were some nice breaks in the am.

      Sunny breaks amongst the cloud. 15:00 Hrs.

      When we get back into a warm phase some of these cornices will fail!!


FROM SEA TO SKY MIN REPORTS:

Cayoosh Mountain: April 5, 2021


VIDEOS:

Spring Avalanche Concerns in Utah: April 6, 2021


ARTICLES:

Epic avalanche cascade shuts down Hatcher Pass for days: Alaska

Avalanche dog successfully finished cancer treatment: Montana 

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