14 Jan 2020

January 14, 2020


    Early Monday morning.

    High overcast with an arctic front.

     Black and White.

    Great turns to the valley.

    Monday January 14, 2020. 12:00 Hrs. -20.8 Deg C with a 5-10 KPH SE wind.

    Just after noon on Monday.

    Big picture Monday afternoon.

    Days end and not much change.

Weather Observations for January 14, 2020 taken at 06:00 Hours.

2240 meters    -19, Winds were 20-35 KPH W--Horstman Hut
2180 meters    -16, Winds were 10-15 KPH SW--Whistler Peak
1860 meters    -17, Winds were   5-10 KPH SSW --Rendevous 
1835 meters    -19, Winds were   5-10 KPH E--Round House
1650 meters    -21, trace in 12 Hrs, trace in 24 Hrs, Base 194 cm --Pig Alley
1560 meters .  -21, trace in 12 Hrs, trace in 24 Hrs, Base 128 cm--Catskinner
  660 meters    -17, Valley Temp, Max temp Yesterday was -11.9, 0.0 mm of precip yesterday.

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


The Arctic front and associated low will bring unsettled conditions for most of the day in a Northerly flow aloft. A weak front will bring periods of light snow later today into Wednesday, ramping up slightly Wednesday night. Hoping the system Wednesday produces, some models are still on the other side of the equation.  A series of progressively stronger fronts will add to our base into the weekend. Freezing levels will remain well below surface into Friday. Guesstimates: 2-4 cm by Wednesday morning, 15-20 cm by Thursday morning, 3-6 cm by Friday morning.

    GOES IR image from this am.

     Unsettled with cold temperatures for most of the day, light precip this evening.

    Fronts along the coast.

     Low will bring precipitation with cold temperatures for Wednesday.

     Low will continue to affect our area with cold snow on Thursday.


    Avalanches in Kashmir have killed several people. Article below.                                      Net pic.

    Avalanche control on yesterday produced some Sz 1.5 Xh, Xc, Sc.

    Avalanche control on Blackcomb yesterday produced mostly holes. A few sz 1.5 Xh.


    Harmony Chair.

    Cornice noses are fragile.

   Anemometer at 2240 meters.

    Cold temperatures and dry gun pow.

    Man made cloud.

    An explanation of sublimation <click while making snow in cold temperatures.


Day #4 @extremelycanadian AST2 private program in the Chuting Gallery allowed us to investigate a new layer of concern.
Varying intensity of snowfall during Sunday continued to add to storm total accumulation, with dropping temperatures in the afternoon topping the mix with ultra low density and very light breezes at TL and BTL.
Ski penetration at TL and below in protected aspects was up to 65cm. Surface snow was sluffing on slopes over 30 degrees, loose and dry.
A four cm layer of 4F- density snow, laying over near surface facets buried 200110, became an active sliding surface as the afternoon progressed, producing easy ski cuts on sudden convexities over 35 degrees. By 1500 hrs, this layer was down 40-50cm at 1900m on both sides of the Fitzsimmons Valley.
Between 1445 and 1700hrs, temps at 2200m went from -9 to -21C! Winds went from very light at 2000m to Very Strong (65kph and gusts to 100kph) from the north.
As per the current Avalanche Canada bulletin for Sea to Sky, expect to find reverse loaded slopes at TL and BTL today where there was wind effect. There will be slabs and many will be easily triggered especially at sudden, steep convexities.
Suspect most ALP slopes will be sastrugi!


Brohm Ridge: Jan 11, 2020

Round Mtn: Jan 12, 2020

Hanging Lake: Jan 12, 2020


Whistler weather with meteorologist: David Jones

Wind loading: UAC


5 killed, 3 injured in snow-avalanche incidents in Neelan Valley: Kashmir

Canmore Doctor Laura Kosakoski dies after avalanche on Mount Hector: Calgary Sun

Everyone should contribute to avalanche decision making: Crag & Canyon

Snowmaking Basics & Techniques: Ski Sawmill

Simulation of wind induced snow transport and sublimation in alpine terrain: The Cyrosphere

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