9 Apr 2021

April 9, 2021

      YESTERDAY:

      Sunrise Thursday was at 06:33 Hrs. Overcast with isolated flurries. Unsettled weather soon.


      Unsettled weather in the Callaghan Valley 08:00 Hrs. 

      10:30 Hrs -7 with a 5-10 KPH SE wind.


    14:00 Hrs Thursday April 8, 2021. Mostly cloudy over the peaks. + 8 in the valley. -1 at 1650 m.


     Satellite image from the same timeframe as above image.


     Whistler Pak at 19:00 Hrs. -8 35-50 KPH South wind.




Weather Observations for April 9, 2021 taken at 06:00 Hours.

2180 meters    -11, Winds were 55-70 KPH E--Whistler Peak 
1835 meters      -8, Winds were 20-35 KPH SE--Round House
1650 meters      -6, ? trace in 12 Hrs, trace in 24 Hrs, Base 281 cm --Pig Alley
  660 meters     +1, Valley Temp, Max temp Yesterday was +8.5, 0.4 mm of precip yesterday.


      As of 07:00 Hrs this am we have overcast skies and variable visibility.


FORECAST:

An upper trough will send a brief warm front followed by a cold front in a South Westerly flow aloft. We can expect periods of light precipitation with strong alpine winds. The FL will hover in the 900 m range for most of the day dropping to below surface by tonight. Weakening upper trough will bring some light snow early Saturday morning, weak ridging will bring unsettled weather for Saturday with a mix of sun and cloud. Flurries are in the mix for around noon. Ridge strengthens for Sunday with nice weather expected until next Saturday. As the week progresses we will see a steady rise in warm temps by the weekend. Guesstimates: 12-18 cm by Saturday morning, trace-1 cm by Sunday am. Still a chance the system will send most of the precip South. 


      GOES  image from this am.


      Low sending a warm front with a trailing cold front for today.





      South Westerly flow aloft.


      Ridge of high pressure begins to push in by Saturday afternoon.







      Ridge becomes the dominant system for all of next week.


     AVALANCHE ACTIVITY:

     Sz 1 Sa MIN report below. Loose Dry.   Steep Peak Saddle                               FHinkley16 Image

From Whistler Mountain- Isolated Sz 1 Na above 2000 m during last storm. Evidence of loose dry as well.


From Sea to Sky Avalanche Advisory:

Avalanche Summary

Fresh storm slabs are expected to build and become increasingly reactive throughout the day.

A natural avalanche cycle was observed in the region on Saturday during the last 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. There were a few small dry loose avalanches reported on Tuesday. There were no new avalanches reported on Wednesday.

Snowpack Summary

15-25 cm of snow is expected to accumulate throughout the day on Friday, bringing the total this week to about 25-40 cm. Strong southwest winds are expected to accompany the new snow, likely forming fresh and reactive slabs in many areas.

The recent storm snow sits on a crust on sun-exposed aspects, and on all aspects below about 1600 m. It likely sits on soft snow or wind slabs on north aspects. 

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:

      O8:00 Hrs. Thursday. 0 Deg C at 660 m. -6 Deg C at 1650 m.

     Convective cloud development, 10:00 Hrs. 

      Nice afternoon in Pemberton.


FROM SEA TO SKY MIN REPORTS:

The Dome, Steep Peak Saddle: April 8, 2021


VIDEOS:

Descending cloud looks like an avalanche: Nepal


ARTICLES:

Snow falling in the Cascades raises avalanche concerns: Washington State

La Nina is collapsing: Cliff Mass Weather Blog

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