8 Apr 2021

April 8, 2021

    YESTERDAY:

      Early Wednesday am, raining lightly.

      14:00 Hrs Wednesday April 7, 2021. +2 in the valley, -1 at 1650 meters. Raining Lightly.

      Satellite image from same timeframe as above.

      18:45 Hrs trailing edge of the cold front. +1 Deg C in the valley. Snowing 2 cm/hr.


      20:15 Hrs Overcast but dry. +1 in the valley. -5 at 1650 meters.




Weather Observations for April 8, 2021 taken at 06:00 Hours.

2180 meters    -10, Winds were 5-10 KPH NNW--Whistler Peak 
1835 meters      -8, Winds were 5-15 KPH SW--Round House
1650 meters      -8, ?trace in 12 Hrs, 2 cm in 24 Hrs, Base 282 cm --Pig Alley
  660 meters       0, Valley Temp, Max temp Yesterday was +5.1, 1.4 mm of precip yesterday.

Most of the precip yesterday went South. Squamish received 20.1 mm yesterday.

      As of 07:00 Hrs this am in the alpine we have broken cloud and unlimited visibility.

FORECAST:

A weak upper trough of high pressure will push through today in a North Westerly flow aloft, transitioning to Westerly later in the day. A mix of sun and cloud for today with the FL rising to around 1000 m dropping back down below surface tonight.  Will see cloudy skies by tonight. A warm front followed by a cold front will push through Friday with light precipitation, cool temps and strong alpine winds. Weak ridging returns for Saturday mid morning with a mix of sun and cloud and likely some convective flurries in the afternoon. Ridge rebuilds for Sunday and strengthens with warming temps lasting into next weekend. Guesstimates: 0 cm by Friday am, 18-22 cm by Saturday am,  trace-1 cm by Sunday am. A dry sunny week Monday-Saturday. 


      GOES IR image from this am.


      Weak ridging for today with unsettled weather.






      Northerly flow this am transitioning to Westerly during the day.

.         Northerly flow aloft this am, 500 MB image.

      Low will send a frontal band our way on Friday. Cool temps.





       Weak ridging Saturday with unsettled weather.

      Weak ridging with a chance of flurries Saturday afternoon.


AVALANCHE ACTIVITY:

Reports of Sc Sz 1 soft slabs 15-20 cm deep in the South Coast range. Wind slabs on glaciated terrain. 


From Sea to Sky Avalanche Advisory:

Avalanche Summary

Reactive wind slabs may be found on a variety of aspects due to changing wind directions.

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. There were a few small dry loose avalanches reported on Tuesday.

Snowpack Summary

5-10 cm of snow accumulated throughout the day on Wednesday, and another 5-10 is expected to fall on Wednesday night. This adds to the 20 cm that fell over the weekend. Moderate to strong winds have likely formed wind slabs in lee terrain features.

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. 

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:

      Power flurries later in the afternoon as the cold front pushed through.

      The Raven says good turns to be had on Sunday!!!



FROM SEA TO SKY MIN REPORTS:

No new MIN reports as of 07:00 Hrs.


VIDEOS:

Spring Avalanche Hazards April 7, 2021: Montana


ARTICLES: 

Loud explosions near Revelstoke just avalanche control: Revelstoke Review

Snowboard Guide Sam Thackeray expects shift in avalanche education to Humans: The Inertia

Vail Resorts Federal and State Law violations case should proceed in all 9 States: Lawyers for Employees

Multiple avalanches and continuing danger will keep Hatcher Pass Road closed: Alaska

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