19 Dec 2018

December 19, 2018

    YESTERDAY:

    Very early Tuesday morning, snowing 2 cm per hour.

    Great pow turns in the morning.

    Some breaks in the morning.

    Round house roll                                                                                        Kary Firstbrook Image

    Strong winds with drifting below tree line.

    Flurries to steady snowfall on Tuesday. From 06:00 to 14:00 hrs, 11cm at 1565 m 14 cm at 1650 m.

    Breaks in the afternoon with some sun flurries.

    Tuesday afternoon.


Weather Observations for December 19, 2018  taken at 06:00 Hours.

2240 meters       -6, Winds were 50-75 KPH E--Horstman Hut
2180 meters       -6, Winds were 65-80 KPH S--Whistler Peak
1860 meters       -4, Winds were 25-40 KPH SE--Rendevous
1835 meters       -4, Winds were 25-60 KPH SE--Round House
1650 meters       -2, 5 cm of new, 19 cm in 24 hrs, Base 206 cm--Pig Alley
1565 meters      +1, 6 cm of new, 17 cm in 24 hrs, Base 142 cm--Catskinner
  660 meters      +3, Valley Temp, Max temp Yesterday was +2.7, 16.5 mm of precip recorded yest

   As of 07:00 hrs this am we have obscured skies, limited visibility and snowing less than 1 cm per hr.


FORECAST:

An upper low in the Gulp of Alaska will send flurries with overcast skies in a Westerly flow aloft for today. The FL should hover in the 1400 meter range dropping to 1000 by tonight. A strong Pacific front will arrive late tonight into Thursday with strong winds and moderate/heavy precipitation. The FL is expected to rise with the leading warm front and could go as high as 1700 meters but drop back down to surface with the passage of a trailing cold front. That is looking at the high end, hopefully it will peak at 1400 meters. Weak ridging will bring unsettled weather for Friday leading up to another frontal band Friday night into Saturday with cold temperatures and light to moderate snow. An impulse Saturday night will bring cold dry snow for Sunday. Guesstimates: 20-30 cm by Thursday morning, 30-40 cm by Friday morning, trace-2cm by Saturday morning. Possibility of 20-30 cm by Sunday morning??



    GOES IR image from this am.


    Upper low for today with the FL hovering in the 1200 m range, dropping tonight to 1000.








   Fronts along the coast.


    Brief spike in FL Thursday afternoon.








    Cooler temps on Friday with some ridging.

    Shortwave trough with some light snow for Saturday. FL at surface or just above.


    AVALANCHE ACTIVITY:


    Skier triggers avalanche on Bridger Peak, Montana. Article below                              Net Pic   


   Avalanche control yesterday on WB produced Sz 1-3.5-Xe, Xc, Xt. 


   Shale slope yesterday,  Sz 3.5                                                                          Kary Firstbrook Pic

   Shale Slope yesterday controlled with explosives ran on 18-11-03 layer.      Phil Benjamin Pic


    Debris from Shale slope reached the reservoir.                                               Phil Benjamin Pic


    INFORMATION & OBSERVATIONS:


    200 cm of new snow in 7 days. Dec 18, 2018


    Cornices are developing!!


   Just be careful where you send it!!!


    There have been many tree well and snow immersion incidents in the past week.

   Off to Lower Disease ridge.


                           Snow profile from Dec 15. 



    Drying out later on Tuesday.


    Last atmospheric river headed to California.

From Avalanche Canada MIN Reports:

Wendy Thompson Hut: Dec 17, 2018



ARTICLES:

Skier Triggers avalanche on Bridger Peak: Montana

The do's and dont's of Quick Pits: Backcountry Magazine

UK'S first avalanche rescue dog: Glenshee

Special Weather Statement: Whistler

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