13 Dec 2019

December 13, 2019

    YESTERDAY:

    Thursday December 12, 2019. 12:00 Hrs. -3.5 Deg C with a 15-20 SSW wind & snowing lightly.

    Snowing lightly Thursday morning. By 14:00 Hrs 3 cm was recorded at Pig Alley. (1650M)

    Lots of skier compaction going on.

    Thursday afternoon.

    Low developing in the Gulf of Alaska.. Thursday afternoon.


Weather Observations for December 13, 2019 taken at 06:00 Hours.

2240 meters      -7, Winds were 25-30 KPH SE--Horstman Hut
2180 meters      -7, Winds were 15-20 KPH SW-Whistler Peak
1860 meters      -5, Winds were   5-10 KPH S --Rendevous 
1835 meters      -5, Winds were   5-15 KPH W--Round House
1650 meters      -3, 1 cm in 12 Hrs, 4 cm in 24 Hrs, Base 50 cm --Pig Alley
1560 meters .    -3, 1 cm in 12 Hrs, 3 cm in 24 Hrs, Base 18 cm--Catskinner
  660 meters     +1, Valley Temp, Max temp Yesterday was +3.0, 5.7 mm of precip yesterday.



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


FORECAST:

A weak slow moving frontal band will push through today in a Westerly flow aloft. The freezing level will hover in the 900 meter range, slowly dropping to surface by Saturday morning as a weak ridge builds into our zone. So for today we can expect mostly cloudy skies with possible periods of light precipitation this am. Will likely see some breaks as well. The ridge will bring mostly sunny skies tomorrow around noon. The ridge strengthens for Sunday with sunny skies and the FL dropping below surface. As of now looks like a weak front arrives for Monday! Looking forward, there is a good chance of some stronger Pacific fronts for next week. Every centimetre counts. Guesstimates: Trace-1 cm by Saturday morning.



    GOES IR image from this am.


    Very weak slow moving frontal band for today.





    Fronts along the coast.

    High pushes back into our zone Saturday with some colder air from the East moving in as well.





        High strengthens Sunday. Large low to the North.



    AVALANCHE ACTIVITY:

    Avalanche control yesterday produced some Sz 1.5-2 stepping sown into the Nov 23 Fc/Mfcr.



    INFORMATION & OBSERVATIONS:

    Many different courses on Whistler yesterday. High at 1860 meters was -3 deg C.

    AVSAR Training?!!

    Must be a biker?!!

    Top of  Emerald Chair. Active control work in the early am on Whistler.

    Top of JC Chair.

    Image and observations from Dave Sarkany:

Just thought I'd put this out there. Went for a walk off Whistler late Wednesday. Dug a quick pit (easy to do as snowpack is 100cm).
2035m NE asp. 30°. ECTP2. Down 35cm. On 2-3mm rounding facets.
Failed below 2cm crust. Slab above is 1f-4f hard
In more plain english: Extended column test. Failure propagated across entire column on second tap 35cm below surface. Failed on 2-3 cm rounding facets below a 2cm ice crust.



From Avalanche Canada MIN Reports:

Big White Backcountry Avalanche: Dec 12, 2019


VIDEOS:

Avalanche Airbag Deployed: Alaska


ARTICLES:

Walker injured by Pyrenees Avalanche: France

Avalanche-prone conditions abound across the West: Teton Gravity

Avalanche Instructor's survey of backcountry skier's preparedness had 'Shocking" results: Colorado

74 deaths in 3 years , avalanche danger high for Indian Soldiers: Kashmir

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