21 Dec 2019

December 21, 2019


    Friday Dec 20, 2019. 15:45 Hrs -4.2 Deg C with a 10-15 KPH breeze SE. Snowing  lightly.

    Early Friday morning, snowing lightly.

    Awesome to see a nice dump of snow.

    Not a skier in sight.

    Periods of light snow during the day. 5 cm recorded at 1650 meters by 14:00 Hrs.

    Dusk 16:30 hours. High in the valley Friday was +1.1 Deg C.

    Friday afternoon.

    Big picture Friday afternoon. Seattle got hosed!!

Weather Observations for December 21, 2019 taken at 06:00 Hours.

2240 meters      -6, Winds were 20-30 KPH SE--Horstman Hut
2180 meters      -6, Winds were 15-20 KPH SSW--Whistler Peak
1860 meters      -4, Winds were 10-15 KPH SE --Rendevous 
1835 meters      -4, Winds were   5-10 KPH SE--Round House
1650 meters      -3, 6 cm in 12 Hrs, 11 cm in 24 Hrs, Base 109 cm --Pig Alley
1560 meters .    -3, 6 cm in 12 Hrs,   9 cm in 24 Hrs, Base  59 cm--Catskinner
  660 meters       0, Valley Temp, Max temp Yesterday was +1.1, 6.1 mm of precip yesterday.

    As of 07:00 Hrs this am we have obscured skies, limited visibility, & snowing lightly. Lifts open 08:00.


A weak upper trough will slowly migrate South, a weak ridge begins to build in a Southwest flow aloft. The freezing level will drop to surface later in the day. Mostly cloudy for today with some breaks this afternoon. Unsettled Sunday with a mix of sun and cloud with a Westerly flow aloft.
The FL should drop to just below surface. High pressure will bring sunny skies for Monday. Guesstimates: trace-2 cm by Sunday morning, Trace-1 cm by Monday morning.


    Busy day with avalanche control Friday. Sz 2-3 on Whistler & Blackcomb.

    Xy while doing control work in Blackcomb Bowl. 4-5 meter crown line. Low Test

    Shot on regulator took out slabs as far as Low Test.

    Sz 2.5 Xe in Blackcomb Bowl.

    Xr just below Bushrat Shoulder.

    Sz 2 Whistler Cornice.

    Sz 2.

    Sz 3 out of LW East Hi

    Sz 2 Camel Back


    New snow instabilities at tree line.

    Powder Friday morning.

    Just a bit of rime.

    Cloud layers in the afternoon.

    Looking into Horstman Glacier.

               Recent profile.

Avalanche Canada MIN Reports:

Wendy Thompson Hut Observations: Dec 20, 2019

Paul Ridge: Dec 20, 2019


Facets on Crust, Case Study: Bruce Jamieson

Whistler Weather with David Jones: Dec 20, 2019


Avalanche Danger all over: Castnet

Avalanches and Rock slides close BC Highways overnight: Summerland Review

Avalanche closes road in Northern Iceland: Iceland Monitor

The Mount Baker Experience Guide to Avalanches: Experience Guide

The "Pineapple Express" just caused Seattle to have its wettest day since 1900: NarCity

10 Things to know about the shortest day of the year: VOX

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