16 Dec 2018

December 16, 2018


    YESTERDAY:

    Blackcomb Gondola opens on Saturday morning.

    Mostly cloudy early Saturday morning.

    Some breaks later in the morning.

    Blue bird for a while.

    Clouds moved in later on in the afternoon.

    Front approaching.

    Next front moving onshore saturday afternoon.


Weather Observations for December 16, 2018  taken at 06:00 Hours.

2240 meters       -4, Winds were   75-135 KPH SE--Horstman Hut
2180 meters       -4, Winds were 100-135 KPH SE--Whistler Peak
1860 meters       -2, Winds were     25-60 KPH S--Rendevous
1835 meters       -2, Winds were     45-75 KPH E--Round House
1650 meters       -1, 15 cm of new, 15 cm in 24 hrs, Base 173 cm--Pig Alley
1565 meters       -2, 17 cm of new, 17 cm in 24 hrs, Base 111 cm--Catskinner
  660 meters        0, Valley Temp, Max temp Yesterday was +2.7, 0.3 mm of precip recorded yest


    As of 07:00 Hrs we have obscured skies, limited visibility and it is snowning 2 cm per hr.

FORECAST:

A broad upper trough with strong winds and moderate to heavy precipitation will push through today in a Southerly Flow aloft easing by Monday morning. The FL is expected to go up to 1700 meters but thinking 1500 meters.  Another front for Monday night into Tuesday with slightly cooler temps. A lull for Wednesday with light snow and seasonable temperatures. A possible atmospheric river for Thursday with warm temperatures and heavy precipitation. Looks like that event will get pushed through quickly with some weak ridging by Friday. Guesstimates: 35-45+ cm by Monday morning, 25-35 cm by Tuesday morning, 20-25 by Wednesday morning, 10-15 cm by Thursday morning, 50+ cm above 1650 meters by Friday morning.


    GOES IR image from this am.



    Broad upper through over the area, colder air from the North slowly pushing South.


    FL as of 06:00 Hrs was at 660 meters.


    Lets hope it spikes at 1500 meters. Hoping for 1200 m!!


    Fronts along the coast.


    Low slides down the coast on Monday. Another front Monday night.


    Light snow fall Monday morning. Break between frontal bands.


   Next front Monday evening.


    More snow and cooler temps for Tuesday.


    Low sends more snow for Wednesday. More intense by Wedneday night.


    AVALANCHE ACTIVITY:


   Fracture line below the Curl. Mostly Sz 1 results yesterday on Blackomb Sz 2.5 on Bushrat.


    Fracture line on Surprise. Sz 1-3 results on Whistler. 


    Sz 1-3 Xe, Xh, Xc from avalanche control on Saturday.

    Hanging Roll result Xh(heli bombing) Also natural activity observed to Sz 3 during the storm.

   Debris from Hanging Roll.

   
    INFORMATION & OBSERVATIONS:
    Saturday afternoon. Another awesome day in the mountains.


    Awesome powder in the alpine and below tree line.


    There were areas of wind affected snow.


    Santa leaving 7 Th heaven behind.


    Layers of snow.


    Front that pushed through last night.


From South Coast Touring:

Mitch Sulkers
Extemely Canadian AST2 group investigating storm slab instabilities yesterday in the Spearhead Range.
Viddy clip is first hit from the elbow during an Extended Column Test. Sudden planar at 11 down 50-65 (unevenly cross loaded slope). Pit at 2060m, WSW aspect, alpine slope at 35 degrees. Total snowpack 210cm.
Failure was an interface with 1F- slab over 4F- lower layer.
Compression tests in same pit were CTE (7) down 52 (same layer) repeated Sudden Planar resulting in block sliding off.
We also observed a 24-48 hr old crown on a convexity change at 2010m on a NW aspect nearby. Natural trigger during last storm.


ARTICLES:

Avalanche Canada points particular warning for B.C. MountainsDanilplosh

Helicopter Company uses new technology to aid in Searches: RECCO

Avalanche Canada issues special warning for B.C. Mountains: CTV News

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