29 Dec 2019

December 29, 2019

    YESTERDAY:

    Saturday December 28, 2019. 13:00 Hrs. -1.5 with a 20-40 KPH S wind.

    Uneventful clouds.

    Looks like winter in the valley!!! Alpine not so much!

    There is always fun to be had!!

    Saturday Afternoon

    Big Picture Saturday.


Weather Observations for December 29, 2019 taken at 06:00 Hours.

2240 meters      -3, Winds were 30-40 KPH SE--Horstman Hut
2180 meters      -3, Winds were 30-40 KPH S--Whistler Peak
1860 meters      -1, Winds were   5-15 KPH S --Rendevous 
1835 meters      -1, Winds were 10-15 KPH ESE--Round House
1650 meters      -2, 1 cm in 12 Hrs, 2 cm in 24 Hrs, Base 92 cm --Pig Alley
1560 meters .    -2, 1 cm in 12 Hrs, 2 cm in 24 Hrs, Base 48 cm--Catskinner
  660 meters      -1, Valley Temp, Max temp Yesterday was +0.5, 3.0 mm of precip yesterday.



    As of 07:00 Hrs we have broken cloud and unlimited visibility.


FORECAST:

Low to the North will send an upper trough into the area later today with some light precipitation in a Southerly flow aloft. The freezing level may spike to 1800 meters this afternoon, then drop back down  to 1000 meters with the passing of the cold front. . Unsettled weather for this morning, mix of sun and cloud, but increase in cloud this pm as a weak cold front pushes through. Monday will see periods of light precipitation which will continue into Tuesday with a series of moist frontal bands until at least Thursday. Unsure of this scenario, we may see unsettled weather for Monday but looks like the low to the North might surprise us. More on that tomorrow. The jet stream will bring a moist over due Pacific front  for Tuesday with strong winds. Guesstimates: 2-6 cm above 1500 meters by Monday morning, 8-16 cm by Tuesday morning, 15-30 cm by Wednesday morning.


    GOES IR image from this am.


    Ridge over Southern B.C. and the upper trough offshore will bring unsettled weather for today.





    Fronts along the coast.

    Difficult to say which will prevail for Monday. Going with the low? Might be wrong.





    Strong moist front for Tuesday. High being pushed South.



    AVALANCHE ACTIVITY:

     An avalanche has killed three people in Val Senales, Italy. Article below.               ANSA/AP Pic



                                Snow profile from Europe. Some Similarities.

    Old Fracture line on Low Test. Overcast day with obscured skies in the alpine.



    INFORMATION & OBSERVATIONS:

    North side on Blackcomb alpine closed, Thin loose snow on breakable crust above depth hoar. :(

    Snow laden branches in the valley.

    High at 1200 meters was -3 Deg C yesterday. A slight inversion on Saturday.

    Snowing at 660 meters Saturday around noon. 3.0 mm of precipitation recorded yesterday.

    Comments and photo from Mitch Sulkers, AST 2 course with Extremely Canadian.

In the Musical Bumps with @extremelycanadian AST2 yesterday from 1700-2000m. Moderate to strong winds at ridgetops for the day. Moderate wind transport building windslabs throughout the day.
Compression tests at 1750m East aspect returned moderate to hard sudden collapses (drops) on facets over the 192123 Crust, down 80cm in a total snowpack of 110 at that elevation.
Windslabs at ridgetop sensitive to light triggers and going to size 1.5.
We road mellow slopes less than 30 degrees with no overhead danger. No rocks were harmed and turns were delightfully creamy. In the right places, the upper BTL zone has sufficient snow for good turns.



From Avalanche Canada MIN Reports:

Round Mountain: Dec 27, 2019

Adit Lake Bowl: Dec 28, 2019

Musical Bumps: Dec 28, 2019



ARTICLES:

Avalanche in South Tyrol kills woman and two girls: Italy

Another avalanche death in the Dolomite Mountains: Italy

Limit the danger of avalanches in the Alps: Archyde

Avalanche Danger & Road Closures in Western: Colorado

Avalanche Risk 4 in Verbier: Safety & Ski Tips

Backcountry Travellers learn ins and outs of avalanche safety: Colorado

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