1 Jan 2019

December 31, 2018


    YESTERDAY:

    Sunday morning. Mostly sunny with evdence of large avalanche cycle during last storm.

    Brilliant morning.

    There were some great turns to be had.

    A few more clouds in the afternoon.

    Sledders were enjoying the snow.

    Where did he go??

    Pemberton Fog layer slowly moving South.

    Another awesome day.



Weather Observations for December 31, 2018  taken at 06:00 Hours.

2240 meters     -12, Winds were 25-50 KPH NNE--Horstman Hut
2180 meters     -12, Winds were 10-30 KPH N--Whistler Peak
1860 meters     -10, Winds were 10-20 KPH N--Rendevous
1835 meters     -10, Winds were 10-15 KPH NE--Round House
1650 meters     -10, 0 cm of new, 0 cm in 24 hrs, Base 204 cm--Pig Alley
1565 meters       -9, 0 cm of new, 0 cm in 24 hrs, Base 143 cm--Catskinner
  660 meters       -2, Valley Temp, Max temp Yesterday was +4.8, 18.7 mm of precip recorded yest




FORECAST:

The upper ridge will bring a sunny dry day with some cloud in a Northerly flow aloft. Clouds will spill over the top of the ridge from a very large low to the North. Weak ridging for Tuesday with mostly cloudy skies and some afternoon sunny breaks. The ridge flattens on Tuesday night with a cold front pushing through in a Southwest flow sometime early Wednesday morning. The cold front will transition into a warm front with the FL slowly rising by Thursday. Another cold front by Thursday night with an upper level trough developing on Friday. Chance of some ridging for Saturday. Fairly vigorous system for Wednesday through Friday with periods of moderate to heavy precipitaion and the FL spiking at 1800 meters. Will have more information on the fluctuating FL as we get closer. Guesstimates: 20-30 cm by Thursday morning, 30-40 cm by Friday morning, 10-15 cm by Saturday morning.


    GOES IR image form this am, High pushing Low to the North.

    Upper ridge with cold temps for today in a Northerly flow aloft.






    Fronts along the Coast.

    High still pushing but low is strengthening.




     Low winning FL are rising.

     Windy, wet and warm for Thursday.


    AVALANCHE ACTIVITY:

    Avalanche control on WB yesterday produced some Sz 1-1.5 with Xe, Xh, Sc. Not many results.

     Large fracture line Northwest of Whistler                                                                   Al Collis Pic

    Debris on the road at Phelix Creek.                                                                          Toby Salin Pic

    Avalanche right down to the ice.

    Wide spread avalanche cycle during the last storm.

    INFORMATION & OBSERVATIONS:

    Some surface releases just after the storm.

    Northerly winds.

    Snow stripped down to the crust.

    Snow Devil.

    Exposed ridge lines were scoured.


FROM AVALANCHE CANADA MIN REPORTS:

Disease Ridge: Dec 29, 2018



FROM SOUTH COAST TOURING:
MIKE JONES
Headed up to Paul Ridge today. There was a thick rain crust on all aspects up to at least 1650 metres, with 2-3cm of graupel and surface hoar on top. Since ski conditions were universally shitty, we dug a pit at ~1600m on a W/SW aspect to check out the snowpack. HST was 250cm, dug down to 150cm. The top 25 cm consisted of 2cm of graupel over a thick rain crust, then ~20cm of 4-finger-density storm snow, then another thick rain crust over a layer of buried surface hoar (noticed this same surface hoar while out on the 27th in the same area). Did a compression test and got a sudden planar shear with the first tap from the elbow (M11): noticeable collapse of buried surface hoar layer, clean shear of entire "ice cream sandwich" (20cm storm snow bracketed by thick rain crusts). Also noticed that there had been a natural size 1 avalanche (10m wide, 20cm deep, 15-20m runout) on the same aspect and elevation triggered by one of many nearby point releases (mostly caused by trees shedding heavy snow).
There were a few weird layers in there - rain crusts, buried surface hoar, graupel. Lots to keep an eye on.



ARTICLES:

8 Tips for staying alive in the wintery wilderness: CBC News

Avalanche warning issued by Gallatin National Forest Avalanche Center: Montana

Snoqualmie Pass: NAC


No comments:

Post a Comment